# Raptor RDF Parser Library - Release Notes

## Raptor 1.4.18 Changes

Fixed Issues:

- 0000186: Add RDFa support to Raptor
- 0000255: rss-tag-soup serializer does not generate namespaces so re-serializing in rdf/xml looks wierd for atom

### Parser Changes

A new RDFa parser was added (name `rdfa`) using librdfa to implement it. librdfa is linked as part of Raptor and written by Manu Sporny of Digital Bazaar, licensed with the same license as Raptor.

The RDFa test suite was added to the test and (via librdfa) Raptor passes all but 4 tests which fail due to different output xmlns attribute ordering (which does not matter to XML parsers).

### Serializer Changes

Added new function `raptor_serialize_start_to_iostream()` to have the new semantics of not owning and destroying the passed-in iostream. This allows the caller to serialize to an existing iostream and then to continue to write to it. `raptor_serialize_start()` owns and then closes the iostream that is passed in.

A new Atom Syndication Format 1.0 (RFC 4287) serializer was added (name `atom`) using the RSS 1.0 RDF triple model with mapping to atom terms and consideration of atom output format conditions.

RSS 1.0 serializer

- Allow setting output namespaces for the serializer
- Allow writing extra RDF triples as RDF/XML attached to RSS items.
- Recognize predicates with XML Literal and emit as `parseType="Literal"` or when `content:encoded`, as a CDATA block, by RSS 1.0 convention.
- Removed code assumptions about triples appearing in a certain order.
- Free namespaces and stack in correct order

Turtle serializer now respects the `writeBaseURI` feature to control generating the `@base` directive.

Abbreviated serializers (RDF/XML Abbrev and Turtle) now remove duplicate triples.

Added feature `RAPTOR_FEATURE_RSS_TRIPLES` to add RDF triples to RSS 1.0 or Atom serializer output with values 'rdfxml' or 'atom-triples'. Atom triples writes `at:map` sections for the `atom:entry` elements and at:feedmap and `at:entrymap` sections to the `atom:feed` elements. `at:contentType` is used to provide a `type` attribute value for an `atom:content` that has a URI value.

Added `RAPTOR_FEATURE_ATOM_ENTRY_URI` for the Atom serializer to set the URI of an atom entry. If the URI matches the URI of an entry item in the RDF mode of the channel, then an Atom Entry document is generated rather than an Atom Feed document.

### QName Class Changes

Added `raptor_qname_to_counted_name()` to get a formatted qname for a name.

`raptor_new_qname_from_namespace_local_name()` will accept a NULL namespace to construct a namespace-less qname.

### Sequence Class Changes

`raptor_sequence_set_at()` now handles setting an item at an index in the sequence beyond capacity+1 to automatically extend.

Added `raptor_sequence_delete_at()` to delete an item at a position in a sequence and return it.

### URI Class Changes

`raptor_uri_to_relative_counted_uri_string()` now has support for a base URI with scheme and authority but no path, so the result can be a relative URI starting with '/'.

### XML Writer Class Changes

XML Writer allows adding newlines via `raptor_xml_writer_newline()` which requires use of `raptor_xml_writer_flush()` to indicate when XML writer output is finished.

Added `raptor_xml_writer_get_depth()` to get the current XML writer element stack depth.

### Other Changes

Many more resiliance checks were added.

Removed all calls to abort() in code on fatal errors. This requires using setjmp and longjmp inside parsers built with flex and bison.

The Turtle writer may optionally generate @base depending on flags. (This is used by Turtle serializer to handle the writeBaseURI feature)

Tidied error messages for `rapper(1)` when parsing stdin.

raptor_init() and raptor_finish() use a reference count to ensure initialising and terminating happen at most once each.

## Raptor 1.4.17 Changes

The main changes to this release are:

Added two new JSON serializers: resource-centric 'json' (Talis RDF/JSON) and triple-centric 'json-triples'.

Made I/O Stream class `raptor_iostream` support reading as well as writing with new constructors and new methods.

Added a new public SAX2 API class `raptor_sax2` exposing the existing internal API which has been around since the first release of Raptor 8 years ago and runs on top of either expat or libxml2.

Added new public error handlers structure `raptor_error_handlers` containing a set of (function, data pointers) pairs called `raptor_handler_closure` for each error log level. Added `raptor_log_level` enum for the error log level. Added an initialization function for the structure, `raptor_error_handlers_init()`.

Several other API changes, fixes and improvements were made.

Fixed Issues:

- 0000252: Allow controlling of cache headers in Raptor
- 0000245: Extra classes added to an OWL object

### I/O Stream class changes

Made I/O Stream class `raptor_iostream` support reading data in addition to writing. (Dave B):

- Deprecated `raptor_iostream_handler` structure for new `raptor_iostream_handler2` structure which contains the new factory functions for reading.
- Added new read I/O stream factory handler typedefs `raptor_iostream_read_bytes_func` and `raptor_iostream_read_eof_func`.
- Added new `raptor_new_iostream_from_handler2()` I/O stream constructor to allow building of read and write iostreams deprecating `raptor_new_iostream_from_handler()`.
- Added new `raptor_iostream_tell()` deprecating `raptor_iostream_get_bytes_written_count`.
- Added new read I/O Stream constructors: `raptor_new_iostream_from_sink`(), `raptor_new_iostream_from_filename()` `raptor_new_iostream_from_file_handle()` and `raptor_new_iostream_from_string()`
- Added new read I/O Stream methods `raptor_iostream_read_bytes()` and and `raptor_iostream_read_eof()`.

Added new write I/O Stream method `raptor_iostream_write_string_python()` to write an encoded string to an I/O stream using python / JSON / Turtle / N-Triples / SPARQL escaping rules. (Dave B)

### Serializer Class Changes

Added two new JSON serializers (Dave B):

1. Resource-centric serializer named `json` based on Talis RDF/JSON Specification
2. Triple-centric serializer named `json-triples` based on the SPARQL results in JSON format.

Added new serializer features for the JSON serializers (DaveB):

- `RAPTOR_FEATURE_JSON_CALLBACK` (name 'jsonCallback') to set the top-level callback function name wrapper above the outer object.
- `RAPTOR_FEATURE_JSON_EXTRA_DATA` (name 'jsonExtraData') to add extra top-level JSON object data.

Example of using the resource-centric serializer while defining a callback:

    $ rapper -q -o json -f jsonCallback=foo http://librdf.org/raptor/raptor.rdf
    foo(
    {
      "http://librdf.org/raptor/#raptor" : {
        "http://usefulinc.com/ns/doap#description" : [ {
    ...

### Statement Class Changes

Added `raptor_statement_compare()` to provide an ordering between `raptor_statement` objects. (Dave B)

### Parser Class Changes

Added new parser features to control HTTP headers in web requests (Dave B, based on a patch in the bug):
Also never `Pragma:` header with libcurl ever.
Fixes Issue#0000252

- `RAPTOR_FEATURE_WWW_HTTP_CACHE_CONTROL` to control sending `Cache-Control` (default: none)
- `RAPTOR_FEATURE_WWW_HTTP_USER_AGENT` to control sending `User-Agent` (default: none)

Turtle parser:

- Added tests to forbid `'` and `'''`-quoted strings and to forbid `()` in triple predicate position following the updated Turtle spec. (Dave B)
- Write ';' statement terminators with a leading space for consistency with '.' terminator. (Dave R)
- Remove canonicalisation of integer and double to match Turtle latest spec. (Dave B)

### QName Class Changes

Added new methods `raptor_qname_get_local_name()`, `raptor_qname_get_value()` and `raptor_qname_get_counted_value()`. (Dave B)

### SAX2 Class Changes

Added new public SAX2 API class `raptor_sax2` exposind th existing internal one which has been around since the first release of Raptor 8 years ago and runs on top of either expat or libxml2. (Dave B)

- Constructor: `raptor_new_sax2()`
- Destructor: `raptor_free_sax2()`
- XML handler methods: `raptor_sax2_set_start_element_handler()`, `raptor_sax2_set_end_element_handler()`, `raptor_sax2_set_characters_handler()`, `raptor_sax2_set_cdata_handler()`, `raptor_sax2_set_comment_handler()`, `raptor_sax2_set_unparsed_entity_decl_handler()` and `raptor_sax2_set_external_entity_ref_handler()`.
- XML handler factory typedefs: `raptor_sax2_start_element_handler`, `raptor_sax2_end_element_handler`, `raptor_sax2_characters_handler`, `raptor_sax2_cdata_handler`, `raptor_sax2_comment_handler`, `raptor_sax2_unparsed_entity_decl_handler` and `raptor_sax2_external_entity_ref_handler`.
- Set XML Namespace handler method: `raptor_sax2_set_namespace_handler()`
- Parsing methods: `raptor_sax2_parse_start()` and `raptor_sax2_parse_chunk()`
- Other methods: `raptor_sax2_inscope_xml_language()` and `raptor_sax2_inscope_base_uri()`

### Serializer Class Changes

Abbreviated serializers (RDF/XML-Abbrev and Turtle):

- Switched from using a sequence to using an AVL Tree with a cursor to more efficiently (faster) group/sort triples by subject. This changes the previous syntax output order but has no semantic difference. (Dave B)
- Use the AVL Tree to remove duplicate triples. (Dave B)
  Fixes Issue#0000245

Turtle serializer:

- Feature `RAPTOR_FEATURE_WRITE_BASE_URI` added to control writing `@base` directive to Turtle. (Dave R)
- Remove canonicalisation of integer and double to match Turtle latest spec. (Dave B)

### URI Class Changes

Update URI resolving for RFC3986 changes (Dave B)

### WWW Class Changes

Added new method `raptor_www_set_http_cache_control()` to set the HTTP `Cache-Control:` header in requests. (Dave B, based on a patch in the bug)
Fixes Issue#0000252

### XML Class Changes

Added new method `raptor_xml_element_get_language()` to get the language associated with an element. (Dave B)

### Portability and Resilience Changes

Pass on error failures in parser and serializer factory construction. (Lauri)

Abbreviated serializers (RDF/XML-abbrev and Turtle): low memory and allocation failure fixes. (Lauri)

Altered API function signatures of `raptor_uri_set_handler()`, `raptor_uri_get_handler()`, `raptor_new_namespaces(),` `raptor_namespaces_init()` and `raptor_new_xml_writer()` to add appropriate `const`s. (Lauri)

Portability fixes for RAPTOR_API and other macros. (Lauri)

Removal of many sets of writable static data in N-Triples parser, URI class, Unicode NFC code, libxml support, Turtle writer and XML writer. (Lauri)

Portability fixes for `round()` and `trunc()` that are not always available in libc but might be in libm. (Dave B)

Turtle/N3 parsers and serializers, RDF/XML_Abbrev serializer: many low memory fixes and better out of memory errors. (Lauri)

### Other Changes

Rewrote internal error log functions to use new error handlers structures and simplify the calls. (Dave B)

Expanded internal `raptor_avltree` datatype support to add a cursor, allowing it to be used for creating large ordered sequences that need to be walked. (Dave B)

Updated `rdfdiff` utility to handle duplicate triples in inputs. (Dave B)

`raptor_sequence_shift()` and `raptor_sequence_unshift()` are now as efficient as the sequence push and pop operations: O(1). (Lauri)

`autogen.sh` was updated.

`rapper` utility can now accept multiple `-f` / `--feature` options; previously only one parser and one serializer feature was possible.

## Raptor 1.4.16 Changes

The main changes to this release are:

Provide 100% support for the GRDDL W3C Recommendation of 2007-09-11.

The Turtle parser and serializer were updated to support `@base` for specifying a base URI, following Turtle of 2007-09-11.

The Turtle and RDF/XML serializers had performance improvements for large graphs.

Added a TRiG Parser based on Turtle with named graph support.

Several other API changes, fixes and improvements were made.

Fixed Issues:

- 0000188: Wrong RAPTOR_API definition for mingw
- 0000192: raptor_uri_filename_to_uri_string() - getcwd() loop error
- 0000194: parser and serializer don't recognize the same mime types
- 0000195: Compile error in raptor_serialize.c debug code
- 0000207: RDF file can be parsed, but not then serialised.
- 0000210: RAPTOR_FEATURE_WRITER_XML_DECLARATION broken in Ruby
- 0000214: Empty rdf:about, plus base-uri, produces incorrect turtle output
- 0000216: flickrdf segfaults at raptor_serialize_end!
- 0000217: flickrdf segfaults at raptor_serialize_end!
- 0000232: libraptor does not correctly free up libxml error handler, causing crashes in subsequent calls to libxml error handlers
- 0000237: raptor_sequence robustness: item ownership on insert error
- 0000238: GRDDL parser in SVN overwrites blank nodes when merging graphs
- 0000239: GRDDL parser in SVN returns 60 less triples with http://www.w3.org/

### Namespaces Class Changes

`raptor_namespaces_init()` now returns an integer status.

### Parser Class Changes

Added `raptor_graph_handler` typedef and `raptor_set_graph_handler()` to return named graph identifiers during parsing, initially for the TRiG parser.

These were added the GRDDL parser:

- `RAPTOR_FEATURE_MICROFORMATS` (microformats) to enable hCard and hCal microformats
- `RAPTOR_FEATURE_HTML_TAG_SOUP` (htmlTagSoup) to use the HTML tag soup parser if the XML parsing fails
- `RAPTOR_FEATURE_HTML_LINK` (htmlLink) to enable html <link>
- `RAPTOR_FEATURE_WWW_TIMEOUT` (wwwTimeout) for setting URI retrieval timeouts during processing

### XML Element Class Changes

Added `raptor_new_xml_element_from_namespace_local_name()` constructor to make an XML element from a local name relative to a `raptor_namespace`.

### Unicode Class Changes

Defined a new `raptor_unichar` typedef for a Unicode codepoint defined as `unsigned long` which was the previous type used. Altered the Unicode function to take it as a parameter. `raptor_unicode_char_to_utf8()`, `raptor_utf8_to_unicode_char()`, `raptor_unicode_is_xml11_namestartchar()`, `raptor_unicode_is_xml10_namestartchar()`, `raptor_unicode_is_xml11_namechar()` and `raptor_unicode_is_xml10_namechar()`.

### URI Class Changes

Added `raptor_uri_compare()` and `raptor_uri_compare_func` function pointer for implementing it in the `raptor_uri_handler`. The handler now has a version field `initialised` to trigger the new factory method for uri compare when the version is 2 or more.

### WWW Class Changes

Added `raptor_www_set_connection_timeout()` to set the WWW retrieval connection timeout in seconds.

Added `raptor_www_final_uri_handler` typedef and `raptor_www_set_final_uri_handler()` to return the final URI seen during WWW retrieval such as after redirects.

Added `raptor_www_get_final_uri()` to return the final URI after a WWW retrieval which might include redirects.

### Parser Changes

The GRDDL parser/processor was substantially updated and now supports 100% of the Gleaning Resource Descriptions from Dialects of Languages (GRDDL) syntax, W3C Recommendation of 2007-09-11:

- Transforming XML with XSLT 1.0
- Processing XML namespaces.
- Transforming XHTML with XSLT 1.0
- Processing HTML profiles.
- Handling of base URIs and URI redirects.
- XInclude processing.
- Parsing as RDF/XML when it is recognised after a transform.

it also:

- Handles hCard and hCal microformats when feature `RAPTOR_FEATURE_MICROFORMATS` is enabled (default enabled).
- Handles <link type="application/rdf+xml" href="URI" /> to RDF/XML content when feature `RAPTOR_FEATURE_HTML_LINK` is enabled (default enabled).
- Attempts parsing with libxml's HTML parser if XML parsing fails, when feature `RAPTOR_FEATURE_HTML_TAG_SOUP` is enabled (default enabled).
- Discards errors during recursive processing such as 404s, failure to parse, failure of XSLT processing.
- Uses XSLT security - denies reading, writing to files, directories or writing to network.
- Accepts the `RAPTOR_FEATURE_NO_NET` feature to prevent all networking.
- Allows fine-grained URI filtering with `raptor_parser_set_uri_filter()`.

RDF/XML parser recognising was updated to just the start of the document for guessing if it should handle content and to try to avoid html URLs.

RSS Tag soup parser recognising was updated to accept with the string 'feed' in the identifier.

TRiG Parser was added based on the Turtle parser, adding named graphs. It returns name graph URis via a callback set with new API call `raptor_set_graph_handler()`

Turtle parser added `@base` support, fixed turtle escapes to URIs. Recognising was updated to look for `@prefix` early in the document.

### Serializer Changes

Turtle serialiser changes:

- Generate `@base` when an output base URI is given.
- Properly format Turtle XSD doubles using new snprintf code.
- Fix unwanted blank line at end of Turtle list abbreviation.
- Use AVL Tree rather than sequence for significant performance improvement for large serialisations.

RDF/XML serialiser was changed to emit a legal empty RDF/XML document when no triples are serialised and to skip emitting statements with bad predicate uris rather than returning an error.

RDF/XML Abbrev serialiser was changed to use an AVL tree rather than sequence for significant performance improvement for large serialisations.

### `rapper` Utility Changes

Added an `--show-graphs` option to print named graph URIs as seen (such as with TRiG).

Added `-I` / `--input-uri` and `-O` / `--output-uri` options to set the input / parsing and output / serializing base URIs separately. Defaults remain the same - the serializer base URI defaults to the input base URI, however it was set.

### Portability Changes

Fixes for when building from Subversion on cygwin (EOL issues, Makefiles).

Remove unused semicolons for prevention of compiler warnings.

Fix some uninitialized variables that some compilers complain about.

Allow `RAPTOR_ASSERT_DIE` to be externally defined.

Allow `RAPTOR_WWW_BUFFER_SIZE` to be externally defined.

### Other Changes

`autogen.sh` was updated to handle program versions better using an inline perl helper.

Start to add resiliance to memory allocation failures and errors inside the library.

Added AVL Tree code to make much faster key:value lookups. This is used for RDF/XML parser XML ID checks and in the 'abbrev' serializers - Turtle and RDF/XML-Abbrev for looking up nodes.

Better libxml error messages are now returned, mentioning some of the names and values that caused the error.

## Raptor 1.4.15 Changes

### General Changes

GRDDL parser now passes the (unapproved) test suite for the GRDDL W3C Working Draft 2 March 2007 except for two tests that have been reported as having errors.

When using libcurl as the WWW retrieval library, errors in resolving a URI such as not found (404) are now reported as proper errors and cause parsing to fail rather than just return no triples.

Some improvments where made to guessing for a parser to match some content. Firstly, any mime type with Q <10 is added to the score, don't lose the influence of the mime type entirely. The consequence of this is that Turtle can pretend to be a partial N3 parser. Secondly, the XHTML mime type is now correctly recognised by the GRDDL parser rather than the RSS Tag Soup parser.

Fixed Issues:

- #0000174: Serializing to rdfxml* with a base_uri doesn't set the `xml:base` attribute, but does truncate `rdf:about` and `rdf:resource` values
- #0000177: Some URI references mis-resolved
- #0000178: No errors from accessing 404 URIs
- #0000180: messages garble output to stdout

### Parser and Serializer Changes

Added better error reporting for XML errors using the libxml structured error reporing api. From

    $ rapper -i grddl http://librdf.org/LICENSE.txt
    rapper: Parsing URI http://librdf.org/LICENSE.txt
    rapper: Error - URI http://librdf.org/LICENSE.txt - XML error - http://librdf.org/LICENSE.txt:2:
    rapper: Error - URI http://librdf.org/LICENSE.txt - XML error - parser
    rapper: Error - URI http://librdf.org/LICENSE.txt - XML error - error :
    rapper: Error - URI http://librdf.org/LICENSE.txt - XML error - Document is empty
    rapper: Error - URI http://librdf.org/LICENSE.txt - XML error -                   Redland RDF Application Framework - License
    rapper: Error - URI http://librdf.org/LICENSE.txt - XML error -                   ^
    rapper: Failed to parse URI http://librdf.org/LICENSE.txt grddl content
    rapper: Parsing returned 0 triples

To this:

    $ rapper -i grddl http://librdf.org/LICENSE.txt
    rapper: Parsing URI http://librdf.org/LICENSE.txt
    rapper: Error - URI http://librdf.org/LICENSE.txt:1 - XML parser error: Document is empty
    rapper: Error - URI http://librdf.org/LICENSE.txt:1 - XInclude processing failed for GRDDL document
    rapper: Failed to parse URI http://librdf.org/LICENSE.txt grddl content
    rapper: Parsing returned 0 triples

GRDDL parser updated to support the GRDDL W3C Working Draft 2 March 2007:

- Namespace and profile URI handling now works.
- Run XML Include processing
- Throw away XML validation errors
- When a namespace URI is seen that was RDF/XML Mime type, run the RDF/XML parser on the content.
- Look for substrings inside rel attributes when looking for profiles.
- Return a warning and do not fail if XSLT sheet is not found
- Use libxml structured errors for better reporting
- Removed old hard-coded xslt scripts

Turtle parser was changed to accept the N3 mime type `text/rdf+n3` at low Q(quality) so it might work for N3 that is the RDF subset - quite common.

Changed the RSS Tag Soup parser and RSS 1.0 serializer to stop sharing use of the declared namespaces so that when using both at the same time, there is no double-free of the same objects.

Correct the content: namespace URI in the RSS parser and serializers.

### Other Changes

`rapper` gains a `-t/--trace` option to show URIs traversed. Handy for GRDDL.

`raptor_uri_resolve_uri_reference()` no longer goes past the end of buffer when the relative URI is `,/`

Added an internal API for capturing parsed data as it is seen. Use by GRDDL parser but with no public API.

Added an internal API for structured error reporting. Updates made throughout the library but with no public API.

Internal API `raptor_new_sax2()` signature changed to just have an `error_handlers` pointer argument rather than multiple function / user_data pairs.

## Raptor 1.4.14 Changes

### General Changes

Added a Turtle Terse RDF Triple Language serialiser by Dave Robillard based on the existing RDF/XML-Abbrev serialiser.

Added a GraphViz DOT format serialiser by Evan Nemerson.

The GRDDL parser now does namespace and profile URI recursion and has other improvements and fixes.

Fixed Issues:

- #0000032: GRDDL indirection feature request
- #0000141: Crash when GRDDL parser is used with a used-generated blank node ID prefix.
- #0000143: Crash when GRDDL parser fails to retrieve URI.
- #0000148: A public function to generate a blank ID would be nice though.
- #0000155: entity processing in literal property elements (with libxml)
- #0000157: Crash when RDF/XML Abbrev serializer sees a `rdf:type` predicate with a literal object.

### Configuration Changes

`raptor-config` gains a `--private-libs` for the internal libraries used in building raptor, with the public ones only emitted with `--libs`.

`raptor.pc` now uses `Libs.private` for internal dynamically linked libraries.

The libxml minimum version is now 2.6.8 since 2.6.7 crashes on PPC64 Linux. 2.6.8 was released March 2004 so this should be no burden.

Do not use `PATH_MAX` so raptor can build on Hurd.

### Parser Changes

RDF/XML parser now looks for the RDF/XML root element and namespace declaration in the initial bytes of content when guessing. This allows content that is in other mime types such as `application/xml` to be more likely guessed as RDF/XML.

When guessing a parser to use, if an an exact match is found for the mime type (q=10), then that parser is used.

The GRDDL parser has several changes:

- Recurses through the root element's namespace URI and the profile URIs. It excludes several common namespace URIs from processing (XHTML, RDF/XML, XML Schema) and does not traverse the GRDDL profile URI itself.
- Tries to guess which of the RDF/XML or Turtle parser is wanted from an XSLT result. Guessing is performed because not all the XSLT sheets used in the demonstrations set the mime type to match Turtle's unregistered type, or because the return no mime type, or return an XML one, when it was expected RDF/XML would be received.
- Watches the processed URIs and never visits the same URI more than once in a session.
- Passes on general XSLT errors to raptor rather than letting the default (printing to stderr) work.
- Declares XSLT 'base' and 'Base' parameters to allow some XSLT sheets to work - pragmatism.

### Serializer Changes

Added a new Turtle Terse RDF Triple Language serializer and two new internal APIs based on the existing RDF/XML-Abbrev serialiser, written by Dave Robillard:

- `turtle_writer` for serializing triples to Turtle This may be moved to the public API in a future release.
- `raptor_abbrev` for the common 'abbreviated serializer' core that is shared between the RDF/XML-Abbrev and Turtle serializer.

Added a new GraphViz DOT format serialiser writen by Evan Nemerson.

Note that testing the turtle serializing (`make test`) requires the `rdfdiff -u` and a few of the tests take some time to run.

### Other Changes

Added `raptor_home_url_string` and `raptor_license_string` exported strings.

Added `raptor_parser_generate_id()` as a public function to generate an identifier for a parser.

`rdfdiff` gains the -u/--base-uri option to specify the from file base URI so that if the from file is a local file or relative URI, it can be given an absolute base.

Failures to retrieve content from a URI using the `raptor_www` class implementations now return a failure as well as setting the HTTP status code to 403 or 404 as appropriate. Previously success may have been returned with no bytes.

## Raptor 1.4.13 Changes

### General Changes

Prevent losing memory for a `raptor_xml_writer` when a serializer is reused several times.

Fixed issues reported on the Redland Issue Tracker:

- Issue#0000134: Check for equal scheme and authority during construction of relative URIs from two absolute URIs.

### Configuration Changes

In maintainer mode, add all the supported compiler `-W` warning flags to the CFLAGS.

Allow `LEX` to be set to things that aren't exactly 'flex'.

### Documentation Changes

Added single triple serializing example to the tutorial to demonstrate serializing without parsing and building a `raptor_statement`.

### Other Changes

Declare several raptor functions with GCC printf-formatting attributes when using a new enough GCC.

RDF/XML parser now creates literals with `raptor_stringbuffer` so that it does a lot less copying when constructing longer literals.

Added single `raptor_statement` serializing example to demonstrate serializing alone without parsing.

## Raptor 1.4.12 Changes

Restored the order of serialized syntaxes back to the same as in Raptor 1.4.10 which Redland was relying on - asking to serialize to mime type 'application/rdf+xml' without specifying a parser name in Redland with Raptor 1.4.11 wrote it in XMP instead of RDF/XML as it used to. This happened more often with language bindings. That problem will be fixed in a future release of Redland but for now, this stops wierd things like that happening.

## Raptor 1.4.11 Changes

### General Changes

Added `raptor_get_feature_count()` to return the count of features, in preference to using the macro value `RAPTOR_FEATURE_LAST`.

Added `raptor_www_set_uri_filter()` method of the WWW class (`raptor_www`) objects to have an optional URI filter function that checks if the URL given is allowed to be retrieved, or denied entirely.

Fixed issues reported on the Redland Issue Tracker:

- #0000112: raptor_namespaces_qname_from_uri not public API?
- #0000110: strcasecmp problem under windows (raptor_rss.c does not compile)
- #0000091: guess parser should guess the syntax each time it is run, not be fixed
- #0000089: Add a NONET feature to prevent network fetches
- #0000041: Allow multiple transformation URLs in data-view:transformation property
- #0000014: bNode content written twice in rdfxml-abbrev output mode

### Documentation Changes

The Raptor Reference Manual now includes descriptions of all the parsers and serializers and the tutorial has a new section describing how to filter URIs and deny network requests.

### Parser Changes

Added functionality to prevent network requests either via setting a new feature `RAPTOR_FEATURE_NO_NET` that denies network requests during a parser operation or with a URI filter function `raptor_parser_set_uri_filter()`. This function uses `raptor_www_set_uri_filter()` internally.

Added `raptor_get_need_base_uri()` to tell if a parser requires a base URI argument. Presently the N-Triples parser is the only parser that does not require a base URI. `raptor_start_parse()` will now throw an error if no base URI is given and it is needed.

The GRDDL parser was changed to handle a list of URIs in the profile so it now can support `dataview:transformation` in XML taking a list of transformations as defined in The GRDDL profile for XHTML part of the GRDDL specification. It now also recognises Embedded RDF and HCalendar using well known XPaths and transforms them to RDF triples using well known XSLT sheet URIs.

The Guess parser now resets after each parse and does a fresh guess on the syntax based on the incoming information. Fixes Issue#0000091

The Turtle parser (and experimental N3 parser) were changed to now require base URIs as they always should have. The error messages when reporting problems with grammar tokens now return better responses. Added better memory cleanup during parser error recovery.

### Serializer Changes

The RSS 1.0 Serializer now works again.

Updated the RDF/XML Abbreviated serializer to do proper reference counting on the blank/resource nodes used as subjects and objects to prevent dual-triple generation. Fixes the reported Issue#0000014

### Other Changes

The internal SAX2 API can also prevent network fetches with the feature `RAPTOR_FEATURE_NO_NET`.

Fixed a SAX2 problem that caused parsers that use it to leak memory for 1 URI, affected RDF/XML and RSS Tag Soup.

`rapper` help and verbose message formats were tidied.

## Raptor 1.4.10 Changes

### General Changes

No parser will now generate a triple with an identifier type `RAPTOR_IDENTIFIER_TYPE_ORDINAL`. Only identifier type resource, anonymous (blank node) and literal will be generated. All serializers will convert any `RAPTOR_IDENTIFIER_TYPE_ORDINAL` type on input to type resource.

### Configuration Changes

No longer adds LDFLAGS to pkgconfig file `raptor.pc` and `raptor-config` fixing Issue#0000097.

### Parser Changes

All parsers no longer generate a triple with an identifier type `RAPTOR_IDENTIFIER_TYPE_ORDINAL`, as deprecated in 1.4.8. The replacement type generated is `RAPTOR_IDENTIFIER_TYPE_RESOURCE`.

The RSS Tag Soup (`rss-tag-soup`) parser now makes the triples appear before parser destruction. This caused odd symptoms like parsing in python returning no triples and the parser then crashing during object destruction.

The RDF/XML (`rdfxml`) parser no longer crashes if a comment is seen outside an element, such as before or after the root element.

### Serializer Changes

The RDF/XML (`rdfxml`) serializer no longer crashes if the serializer is used more than once.

## Raptor 1.4.9 Changes

### Configuration and Build Changes

Now using Subversion for version control and the Raptor installation instructions explain how to get Raptor from Subversion.

configure now allows `--enable-parsers=node` and `--enable-serializers=none`. Using both is possible!

No longer require libxml2 for the RSS Tag Soup parser

Various Win32 fixes and VC build files updates from John Barstow.

### Documentation Changes

A new Raptor Tutorial was written covering using all parsing and serializing functions along with example code.

The Raptor Reference Manual now covers 100% of all functions, structs and defines with gtkdoc generated documentation.

### `rapper` utility Changes

`rapper` now uses namespaces found in parsing to give hints to the serializer as to how to format the output. The result of this is that `rapper` can be used as an RDF pretty-printer and is especially good at such things as turning flat N-Triples to RDF/XML or RDF/XML-Abbrev. such as:

    rapper -q -i ntriples -o rdfxml-abbrev example.nt

### Parser Changes

All parsers no longer generate `RAPTOR_IDENTIFIER_TYPE_PREDICATE` as the statement predicate type, as deprecated in 1.4.8. The replacement type generated is `RAPTOR_IDENTIFIER_TYPE_RESOURCE`.

The Turtle parser now has `true` and `false` boolean literals, which were accidently omiited from the parser in the 1.4.8 update.

Parsers can register capabilities for handling multiple mime types with Q values. These are then used in WWW requests for content in the `Accept:` header for HTTP. Added `raptor_parser_factory_add_mime_type` for registering, `raptor_parser_get_accept_header` to get the accept header values for the types supported by one parser.

From the previous change, the RSS parser now accepts several unregistered RSS mime types as well as the registered Atom one; the RDF/XML parser accepts unregistered mime type `text/rdf` seen occasionally; the Turtle parser accepts several experimental mime types. All unregistered or experimental types are accepted with lower Q than any registered type.

The RSS Tag Soup parser for RSS* and Atom no longer requires libxml2 (for it's XML Reader API). Internal changes mean that it will fully work on top of expat.

### Serializer Changes

The RSS/Atom serializer now uses input namespace declarations to choose namespaces on output.

Added `raptor_serialize_set_namespace_from_namespace` to set a namespace for serializing from an existing `raptor_namespace`.

Serializing to RDF/XML (or RDF/XML Abbrev) now does not double-free URI strings. Fixes Issue#0000065

RSS serializer no longer writes the XML header twice.

### IOStream Class Changes

Added `raptor_iostream_write_uri` to directly write a URI to an iostream without the need to go via a string.

Fixed bug in `raptor_iostream_write_xml_any_escaped_string` failing to write ';' after escaping U+0009 and U+000A

### Namespaces Class Changes

Added `raptor_namespaces_qname_from_uri` to do URI splitting into qname prefering to use the current in-scope namespaces before having to search.

`raptor_namespaces_format` now NULL-terminates the namespace string. Fixes Issue#0000062

Added `raptor_namespace_get_counted_prefix` to return a namespace prefix and it's length.

### QName Class Changes

Added `raptor_qname_get_namespace` to get the namespace associated with a QName.

### StringBuffer Class Changes

`raptor_stringbuffer_append_counted_string` and `raptor_stringbuffer_append_string` now Do nothing on appending a NULL string or a string of length 0. Fixes Issue#0000073

### Unicode Class Changes

`raptor_utf8_to_unicode_char` now also checks for overlong UTF-8 sequences, illegal code positions or out of range codes.

### URI Class Changes

Deprecated `raptor_uri_is_file_uri` which takes a URI string argument for new function `raptor_uri_string_is_file_uri` which more clearly says that.

Changed all URI string calloc/mallocs to add enough room for a full pointer at the string end to stop valgrind moaning on 64bit systems when looking for the end of string NUL.

`raptor_uri_set_handler` and `raptor_new_iostream_from_handler` now take const handler arguments.

### WWW Class Changes

Get the curl success status into a long, not an int which causes failure on 64 bit. Fixes Issue#0000075

WWW requests for content to parse now always send an appropriate `Accept:` header with Q values for the parser, or for the `guess` parser, all supported mime types.

### Internal Changes

Added XML element methods `raptor_xml_element_get_attributes` and `raptor_xml_element_get_attributes_count`, `raptor_xml_element_is_empty` to the SAX2 API.

Many internal changes were made to the SAX2 API to finally separate XML and RDF/XML parts. The SAX2 API is now fully usable on either libxml2 or expat. That last sentence implies a lot of work, by the way.

## Raptor 1.4.8 Changes

### General Changes

A large source re-arrangement was performed. All C sources and headers that build the library are now in the src dir, general documentation in the doc dir and utilities in the utils dir. This both tidied up the mixture of files at the top level and also enabled better use with gtk-doc.

Future API change: From the next release of Raptor, `raptor_statement` predicates will return identifiers of type `RAPTOR_IDENTIFIER_TYPE_RESOURCE` instead of `RAPTOR_IDENTIFIER_TYPE_PREDICATE`. Identifiers of type `RAPTOR_IDENTIFIER_TYPE_ORDINAL` may no longer be returned in any statement position (to be confirmed).

Version Control change: Raptor will be switching to use Subversion for version control after the 1.4.8 release. Please check the Redland Subversion site for the latest status or the online Raptor installation notes for the raptor specific subversion installation information.

### Configuration Changes

The autogen.sh script for building from CVS was revamped to be more modular.

`configure` now takes an `--enable-gtk-doc` option to enable building of the documentation using the `gtk-doc` utility. It is by default enabled only if the utility is available.

Added a new configure option `--enable-serializers` (in 1.4.7) to allow the selection of the required RDF serializers from any of those supported.

`raptor-config` now has a `--options` argument to list the configured or discovered options of the library such as parsers, serializers and other choices.

### Documentation Changes

The GNOME `gtk-doc` program is now used to automatically extract documentation from source comments into reference documentation. This is then merged with templates and additional documentation to provide a reference manual for raptor as XML document which is turned into HTML along with GNOME devhelp support.

This new documentation intended to replace the libraptor manual page/web page as easier to read document with scope for better expanding with more detail of raptor including examples and tutorial information. The manual page will continue to contain the summary information for the present.

### Portability Changes

Fixed a long-standing URI resolution bug on win32 - only remove leading / if there is one present (patch from John C. Barstow)

### `rapper` utility Changes

Altered the `-g` argument to invoke the guessing parser rather than guess on file/URI name alone. This is now equivalent to choosing an input syntax of guess with `-i guess`.

Added a `--show-namespaces` long option (no short version) to show namespaces that are declared in the parsed content.

### Parser Changes

A new guessing parser was added, picking the actual parser to use at run-time based on protocol or other information.

Allow a content type returned by a protocol (such as HTTP) to enable choosing of parser at run-time. Added a new optional parser factory method `content_type_handler` to return this.

Allow parsers to handle several syntaxes rather than only 1 or 2.

Parsers can now return namespace prefix/URI declarations as they are given in the content by the means of a new handler type `raptor_namespace_handler` and parser method `raptor_set_namespace_handler`. Duplicate namespace prefix/URIs can be returned.

#### GRDDL Parser Changes

Bug fix when the entire content is in one chunk (René Puls).

#### Guessing Parser Changes

A new parser that guesses the actual parser to use at run-time based on a combination of MIME Content-Type, file or URI name and in future, iniital bytes of the content. If the Content-Type is an exact match to a known parser, it is always chosen before trying heuristics.

#### RDF/XML Parser Changes

When emitting literals, handle a datatyped empty literal. This is a post-REC errata for the revised RDF/XML recommendation. See archived example for further information.

#### RSS Tag Soup Parser Changes

Added atom 1.0 support including use of the new namespace. Atom 0.3 namespace terms are turned into new properties. Replace atom copies of Dublin Core or RSS properties with the original terms:

Atom 1.0 term | Original term
--- | ---
`atom:content` | `rss:description`
`atom:id` | `rss:link`
`atom:published` | `dc:date`
`atom:rights` | `dc:rights`
`atom:title` | `rss:title`

Apply the in-scope base URI (such as from `xml:base`) to atom 1.0 fields that take URI values: `atom:id`, `atom:icon` and `atom:logo`.

Added optional date parsing code to turn XML RSS date fields into ISO format ones, suitable for Atom and XML schema datatypes format. Will use library parsedate code from curl or INN if available.

XML RSS field `pubDate` is now turned into Dublin Core `dc:date` field in the ISO format.

XML RSS field `content` is turned into `content:encoded` in RDF triples on output with escaping.

#### Turtle Parser Changes

Updated to support Turtle version 2006-01-02 (announcement).

Switch qname, blank node and prefix definitions to SPARQL ones.

Check for illegal not-hexadecimal \u and \U escape values.

Fix greedy matching of long literals ("""....""") that ended on the last """ found rather than the first.

Added double and decimal constants.

Added optional +- sign to all numeric constants.

Allow \" escape inside long strings.

Take care to reset the generated `raptor_statement` language and datatype fields when not used.

### Serializer Changes

Added a new Atom 1.0 serializer (name atom) by parameterising the RSS 1.0 serializer.

Added a new Adobe XMP compatible serializer (name rdfxml-xmp) by parameterising the RDF/XML Abbreviated serializer. Patch provided by Sid Steward.

All serializers can be chosen at `configure` time from those available using configure option `--enable-serializers`.

The RSS parser and serializer can now be independently enabled or disabled. The RSS serializer no longer requires an XML parser.

### RDF/XML Serializer / XML Writer Changes

A new XML Writer feature `RAPTOR_FEATURE_WRITER_XML_VERSION` was added to allow chosing XML 1.0 (value 10) or XML 1.1 output (value 11). This feature is also accepted by serializers as an option and used by the RDF/XML and RDF/XML-Abbrev serializers.

A new XML Writer feature `RAPTOR_FEATURE_WRITER_XML_DECLARATION` was added to allow omitting the XML declaration (default true).

Added functions `raptor_xml_any_escape_string()` and `raptor_iostream_write_xml_any_escaped_string()` which take an XML version. The XML 1.0 functions give errors when attempting to write #x1-#x1f (excluding #x9, #xA, #xD) or #x7F.

### Atom 1.0 Serializer Changes

Added a new serializer using the Atom 1.0 format and namespace. This reads RDF triples in the RSS 1.0 model, along with any additional atom 1.0 properties and serializes an Atom 1.0 feed file.

### Adobe XMP Serializer Changes

Added a new serializer writing RDF/XML in the profile used by Adobe XMP. Note that this does require RDF triples to be used in a certain style; for example all triple subjects are the "current documment" giving `rdf:about=""`.

### URI Class Changes

Fix a bug when adding a default path of / to a URI in functions `raptor_new_uri_for_xmlbase()` and `raptor_new_uri_for_retrieval()`. (Bug #0000045)

raptor_uri_equals was altered to accept NULL pointers, which do not compare equal to a non-NULL URI. NULL does equal NULL.

### Internal Changes

The internal SAX2 class was extensively changed so that remaining interdependencies with the RDF/XML parser were removed and it can now be re-used for other syntaxes cleanly. Several functions were modified or added.

Removed old and hardly-tested internal support for XML entity resolution (libxml only).

Various fixes for GCC 4 warnings.

## Raptor 1.4.7 Changes

Fix a couple of crashes in the RSS tag soup parser / serializer (Dave Beckett, Suzan Foster).

`configure` now looks for the `libxslt/xslt.h` header as well as the `libxslt` library and disables XSLT and GRDDL support it if is missing. This catches systems with the libraries without headers as has happened on some OSX versions.

In serializers rdfxml and rdfxml-abbrev, report failure to serialize to RDF/XML if the predicate URI is not absolute.

## Raptor 1.4.6 Changes

Added `--with-xslt-config` configure option

Added a new parser for Gleaning Resource Descriptions from Dialects of Languages (GRDDL) which allows reading XHTML and XML as RDF triples by using profiles in the document that declare XSLT transforms from the XHTML/XML content into RDF/XML which is the RDF content. It does not support all the GRDDL styles, for example `dataview:namespaceTransformation`, or perform recursive transformations.

The turtle parser now accepts """long literals"""

XML writer feature support were added in 1.4.5 and not documented. The new functions are: `raptor_xml_writer_features_enumerate`, `raptor_xml_writer_set_feature`, `raptor_xml_writer_set_feature_string`, `raptor_xml_writer_get_feature` and `raptor_xml_writer_get_feature_string`. The three XML writer features added are \fBRAPTOR_FEATURE_WRITER_AUTO_INDENT\fR with boolean value (default true) to auto-indent the XML, \fBRAPTOR_FEATURE_WRITER_AUTO_EMPTY\fR with boolean value (default true) to automatically generate empty elements if a start/end element sequence has no content and \fBRAPTOR_FEATURE_WRITER_INDENT_WIDTH\fR with an integer value (default 2) to set the indenting level for the XML.

New build configuration and portability fixes for win32 (John Barstow)

Portability fixes for win32 - added `SIZEOF_UNSIGNED_SHORT` (Dave Viner, others)

Added a signing memory debugging system to aid checking when raptor-allocated memory is freed in another library or vice-versa enabled by `--with-memory-signing` configure option (defaults to on in maintainer mode).

Fixed a few internal malloc/frees to use RAPTOR_MALLOC / RAPTOR_FREE so that the above signed memory system worked.

RDF/XML serializer: Use the maximal name when splitting a predicate.
Turn datatyped literals that are rdf:XMLLiteral into inline XML with `rdf:parseType="Literal"` rather than XML-escaped.

RDF/XML abbreviated serializer: Fix a crash when there is a NULL base URI. Use the maximal name when splitting a predicate.
Turn datatyped literals that are rdf:XMLLiteral into inline XML with `rdf:parseType="Literal"` rather than XML-escaped.

RSS tag soup parser: Fix crash with unexpected use of `alternate` attribute.
Update from Suzan Foster to reflect the latest status of the enclosure vocabulary and allow multiple common items and fields.

RSS 1.0 serializer: Added RSS enclosures serializing.

`grapper` example GTK program now stores the window width and height using gconf2.

## Raptor 1.4.5 Changes

Added a new RDF/XML with abbreviations serializer `rdfxml-abbrev` written by Steve Shepard which handles several of the abbreviations specified by the RDF/XML Syntax Specification (Revised) W3C Recommendation. It is suitable for writing small documents as there are known scaling issues.

The RSS tag soup parser was updated to work better when there is no base URI given. It also now supports reading the RSS 1.1 format and turning it into RSS 1.0 model triples.

Deprecated `raptor_ntriples_string_as_utf8_string` as rather too internal to be useful, since it only works with a parser.

More fixes to work around the broken libxml2 on Apple OSX 10.3.x with inconsistent shared libraries / headers.

Experimental and incomplete Notation 3 parser - updated to match changes to Turtle. CVS changes only, not enabled in standard builds.

## Raptor 1.4.4 Changes

Make the RSS tag soup parser handle RSS 0.9 namespace elements by turning them into RSS 1.0.

Fix a couple of crashes in the RSS 1.0 serialiser when no base URI is used.

Make `raptor_uri_to_relative_counted_uri_string` work when the base or reference URI have no paths such as like http://example.org

Added portability fixes for Win32 to get Raptor 1.4.3 building with MS Visual Studio using expat and libcurl. The RAPTOR_INTERNAL define was moved to the build configuration and defines added for integral type sizes. Patch from Dave Viner (dviner at apache dot org).

## Raptor 1.4.3 Changes

A release with the major new feature of an XML writer API. This is now used along with a new supporting XML element class to improve the existing RDF/XML serializer and to provide a new RSS 1.0 serializer.

This API it is also used by the next release of Rasqal to provide serializing of query results to XML.

The new `raptor_xml_writer` class functions added are: `raptor_new_xml_writer` (constructor), `raptor_free_xml_writer` (destructor), `raptor_xml_writer_empty_element`, `raptor_xml_writer_start_element`, `raptor_xml_writer_end_element`, `raptor_xml_writer_cdata`, `raptor_xml_writer_cdata_counted`, `raptor_xml_writer_raw`, `raptor_xml_writer_raw_counted`, `raptor_xml_writer_comment` and `raptor_xml_writer_comment_counted`.

The new `raptor_xml_element` class functions added are: `raptor_new_xml_element` (constructor), `raptor_free_xml_element` (destructor), `raptor_xml_element_get_name`, `raptor_xml_element_set_attributes`, `raptor_xml_element_declare_namespace` and `raptor_iostream_write_xml_element`.

### Parser Changes

RSS tag soup parser now works with older libxml2s (2.5.10+), including the one shipped with some Apple OSX versions that has an inconsistent header file and library.

RSS tag soup parser recognises/scores more common XML RSS file names.

RSS tag soup parser turns XML RSS `<guid isPermaLink="true">val</guid>` into RDF/XML form `<guid rdf:resource="val"/>`, leaving the non isPermaLink form to be a literal value.

A bug was found in libxml2 that causes double expanding of XML entities in RDF/XML. This has been reported but cannot be worked around from raptor. The expat XML parser can be used as an alternative, as it does not have this problem. A test was added for this bug but it will not cause the test suite ('make check') to fail.

Added additional Turtle parser tests that cover Notation 3 syntax that is not part of the Turtle language.

Added `raptor_parser_set_feature_string` and `raptor_parser_get_feature_string` methods to set/get string feature values.

### Serializer Changes

Added feature `relative_uris` for serializers. This is used by the RDF/XML serializer and enabled by default.

Added feature `start_uri` for serializers with a string value to set the start URI for serializing. Not used at present.

Added new methods `raptor_serializer_features_enumerate` to list serializer features and functions to set/get serializer feature integer or strings values: `raptor_serializer_set_feature`, `raptor_serializer_get_feature`, `raptor_serializer_set_feature_string` and `raptor_serializer_get_feature_string`.

Added `raptor_serialize_set_namespace` to allow user declaration of prefix/URI namespaces pairs as serializing hints.

the RDF/XML serializer was improved using the new XML Writer class so it now uses any user-declared namespace hints in it's output and emits relative URIs whenever possible. The latter was provided by a patch from René Puls.

A new RSS 1.0 serializer was added, using the new XML Writer class and using the same structures, classes and properties as the RSS tag soup parser.

### URI class changes

Added relative URI generating code from a patch written by René Puls and provide this with two new methods `raptor_uri_to_relative_uri_string` and `raptor_uri_to_relative_counted_uri_string`.

Added `raptor_uri_print` to print a URI to a file handle.

Added methods `raptor_uri_to_string` and `raptor_uri_to_counted_string` to return a URI as newly allocated strings.

### I/O Stream Changes

Many classes gained methods to write to iostreams, supporting the new XML Writer class functionality. The added methods are: `raptor_iostream_write_namespace`, `raptor_iostream_write_ntriples_string`, `raptor_iostream_write_qname`, `raptor_iostream_write_statement_ntriples`, `raptor_iostream_write_stringbuffer`, `raptor_iostream_write_xml_element` and `raptor_iostream_write_xml_escaped_string`.

### Namespace Class Changes

Added `raptor_namespace_copy` copy constructor and `raptor_new_namespace_from_uri` constructor to build a namespace from a raptor_uri object.

Added utility function `raptor_new_namespace_parts_from_string` to decode syntax of the form `xmlns:`prefix`="`uri`"` into prefix and uri string pairs.

Added `raptor_namespaces_find_namespace_by_uri` method for namespace stack to find a declared namespace by URI. This complements `raptor_namespaces_find_namespace` which already provides searching by prefix.

### Unicode and UTF-8 Changes

Added several methods for checking characters forming parts of XML 1.0 or XML 1.1 names: `raptor_unicode_is_xml10_namestartchar`, `raptor_unicode_is_xml11_namestartchar`, `raptor_unicode_is_xml10_namechar` and `raptor_unicode_is_xml11_namechar`.

Added a function `raptor_utf8_check` to check that a string is legal UTF-8 and all the encoded Unicode characters are in the range U+0 <= character <= U+10FFFF

Added a function `raptor_xml_name_check` to check that a string is a legal XML name (1.0 or 1.1) as well as legal UTF-8.

### Other Changes

Feature support: Added `raptor_feature_value_type` to determine value of a feature - either integer (most) or string.

XML QName class: Added `raptor_qname_copy` copy constructor.

Sequence class: Added `raptor_sequence_join` to join two sequences of items, leaving one empty.

Statement class: Added `raptor_statement_copy` copy constructor and `raptor_free_statement` destructor. Previously these were internal to raptor.

The `rapper` utility was modified to add a feature form: `-f xmlns:`PREFIX`="`URI`"` allowing the setting of output serializer namespaces.

The namespace URI string constants exported by raptor are now of type unsigned char*.

## Raptor 1.4.2 Changes

Make `raptor_xml_escape_string` fail correctly when given bad UTF-8 to escape.

## Raptor 1.4.1 Changes

Fixed a buffer overrun in decoding a URI scheme in `raptor_uri` constructors such as `raptor_new_uri`.

Fixed a crash in RSS enclosures crash when the `url` attribute seen on a non-`<enclosure>` element

`raptor_xml_escape_string` return value has changed to be an int, returning <0 on failure. This allows the empty string encoding an empty string case to work and be distinguished from an error.

## Raptor 1.4.0 Changes

A release with the major new feature of providing serializing of RDF triples to syntaxes. It also added a new support class for I/O streams and had other minor fixes.

Added a Raptor Serializer class (`raptor_serializer`) with similar style to Parser (`raptor_parser`). Two serializers are provided, for RDF/XML and N-Triples. The serializing can be done to files, C `FILE*` or to strings. The raptor_iostream class that provides this also allows writing to any other form by creating a custom iostream.

The new raptor_serializer class functions added are: `raptor_serializers_enumerate`, `raptor_serializer_syntax_name_check`, `raptor_new_serializer`, `raptor_free_serializer`, `raptor_serialize_start`, `raptor_serialize_start_to_filename`, `raptor_serialize_start_to_string`, `raptor_serialize_start_to_file_handle`, `raptor_serialize_statement`, `raptor_serialize_end`, `raptor_serializer_get_iostream`, `raptor_serializer_set_error_handler`, `raptor_serializer_set_warning_handler` and `raptor_serializer_get_locator`

Added a Raptor I/O stream abstraction in `raptor_iostream` class to support serializing of RDF to multiple output streams such as to filenames, to C standard I/O `FILE*` handles and to strings especially for cross-language use. A `raptor_iostream_handler` can be used to construct a user-defined iostream.

The new raptor_iostream class functions added are: `raptor_new_iostream_from_handler`, `raptor_new_iostream_to_sink`, `raptor_new_iostream_to_filename`, `raptor_new_iostream_to_file_handle`, `raptor_new_iostream_to_string`, `raptor_free_iostream`, `raptor_iostream_write_bytes`, `raptor_iostream_write_byte`, `raptor_iostream_write_end`, `raptor_iostream_write_string`, `raptor_iostream_write_counted_string`, `raptor_iostream_get_bytes_written_count`, `raptor_iostream_write_decimal` and `raptor_iostream_format_hexadecimal`.

The `rapper` utility was modified to use serializer class so that the output formats supported are now N-Triples (`-o ntriples`) - the default, and RDF/XML (`-o rdfxml`).

Raptor now exports more static namespace URI strings for general application use: `raptor_xml_namespace_uri`, `raptor_rdf_namespace_uri`, `raptor_rdf_schema_namespace_uri`, `raptor_xmlschema_datatypes_namespace_uri`, `raptor_owl_namespace_uri`, and the length `raptor_rdf_namespace_uri_len`.

The raptor_stringbuffer class gained a new method `raptor_stringbuffer_copy_to_string` which allows efficient copy-out of a constructed string.

The raptor_www class gained a new method `raptor_www_fetch_to_string` to allow retrieving of web content as a single string.

RSS tag soup parser gained support for generating triples for enclosures, after a patch from Suzan Foster. Changes made include correcting the enclosures namespace and tidying some memory leaks.

## Raptor 1.3.3 Changes

A release with major improvements along with several minor fixes.

Raptor's License was changed from LGPL 2.1/MPL 1.1 to LGPL 2.1/Apache 2

Thanks to Chris Pointon for several patches to make Raptor easier to build under Win32 which were applied, with some slight modifications.

Increased WWW content retrieval buffer size from 256 bytes to 4K since this was causing problems for even moderate size documents.

After testing raptor on a very large RDF/XML file with many `rdf:ID` values, the check for duplicate values was found to be inefficient in memory and slow. The implementation was improved to be more memory efficient and a new parser feature `check_rdf_id` was added to disable checking (default is enabled).

Added a new Unicode NFC checker to replace the functionality formally available by calling the GNOME glib function g_utf8_normalize. This new checker is done via several tables and adds approximately 50K to the object size of the library when compiled on x86. This code and tables can be disabled with configure option `--disable-nfc-check` causing all checks to succeed.

Fix the exporting of `raptor_xml_literal_datatype_uri_string` and `raptor_xml_literal_datatype_uri_string_len` as constants for use by applications. Previously raptor.h wasn't doing this correctly.

Added `raptor_calloc_memory` for allocating zeroed memory inside raptor, for use by applications passing memory in/out of raptor.

Added a new configure option `--enable-parsers` to allow the selection of the required RDF parsers from any of those supported (RDF/XML, Turtle, N-Triples, RSS tag soup).

Reorganised the sources to split parsing support from RDF/XML to support compiling without this parser.

Updated the RSS Tag Soup parser to start to handle the Atom 0.3 currently being standardised by the IETF Atom Publishing Format and Protocol working group.

Altered the Turtle parser to work with large source documents that exceeded bison limits. Thanks to Geoff Chappell for providing a fix for this.

Rewrote the URI parsing to create an internal structure and improved the relative URI resolving in preparation for future work such as potentially supporting URI canonicalisation such as proposed to be used by Atom.

## Raptor 1.3.2 Changes

A release with some minor fixes.

Added a new configure option `--with-expat-source=`DIR to allow the use of external expat source trees in either the old or newer directory structure style. (Patch from Mark Smith).

Added `raptor_alloc_memory` for handlers that need to allocate memory in the same heap as raptor uses for `raptor_free_memory`. This is mostly useful for allocating memory that is freed by raptor in error, ID and statement handlers on win32 which has separate heaps for different DLLs.

A bug was fixed where errors which happened when fetching WWW content were always printed to stderr. They are now passed to the main error routines which allows applications to retrieve them.

Accessor functions were added for parts of the public `raptor_locator` structure which makes it possible to get structured error information from language bindings via Redland (Patch from Edd Dumbill). The new functions are:

- `int raptor_locator_line(raptor_locator *locator);`
- `int raptor_locator_column(raptor_locator *locator);`
- `int raptor_locator_byte(raptor_locator *locator);`
- `const char * raptor_locator_file(raptor_locator *locator);`
- `const char * raptor_locator_uri(raptor_locator *locator);`

The Unicode Normal Form C (NFC) checking via the GNOME glib library function `g_utf8_normalize` is broken, comparing the data it says is failed against other NFC checkers. It is also slower than need be since it is doing full normalizing rather than just checking for NFC, and adds a rather large dependency for just one function. A new portable checker will be added in a later release.

## Raptor 1.3.1 Changes

A release primarily to fix some win32 and portability issues.

raptor.h now includes stdarg.h

Corrected the `raptor_print_statement` declaration in raptor.h for the argument statement to have one less 'const' which matches the actual code.

Made several portability fixes for compiling natively on win32 which doesn't quite do POSIX or C99.

Changed the support for file: URIs and converting to and from filenames. It now %-escapes spaces and % characters on conversion to and from filenames with `raptor_uri_uri_string_to_filename`, `raptor_uri_uri_string_to_filename_fragment` and `raptor_uri_filename_to_uri_string`. For Win32, more tests were added and the format of URIs supported corrected to use the `file:///c:` form rather than `file://c|/`

URIs that resolve to directories now return an error when lstat is available to check.

### Parser Changes

The Turtle parser was updated to only allow language with non-datatyped literals, allow a '_' immediately after a ':' in qnames and to make a bare ':' qname work correctly.

The Turtle parser was fixed to re-initialise correctly when performing multiple parsings. The other parsers already did this correctly.

Added a warning to the RDF/XML parser for unknown `rdf:parseType` values, when parsing in lax mode - which is the default. It now tells the user when the parsing is working as 'Literal' mode by finding an unknown value. This is controlled by a new parser feature warn_other_parsetypes which is default set true in lax mode. Parser modes are controlled by the `raptor_set_parser_strict` method.

## Raptor 1.3.0 Changes

A release primarily to provide support for the new Rasqal RDF query library but with some new features and fixes.

### Parser Changes

Added a new constructor `raptor_new_parser_for_content` to guess the parser to use from hints in URIs or content, using a new utility function `raptor_guess_parser_name`.

Additional checks were added to the RDF/XML parser for RDF-namespaced names in element and attributes and if they are forbidden giving an error otherwise if unknown, giving a warning.

The Turtle parser was updated to correct the collections syntax, allow '-' in names and QNames and to add integer literals. This parser now correctly uses `raptor_generate_id` when a blank identifier name is needed.

Completed parser feature support by adding `raptor_get_feature`, `raptor_feature_from_uri`, and `raptor_features_enumerate` to get values and enable discovery of supported features at run time. `raptor_set_feature` was changed to give return a success value

Added a new method `raptor_get_mime_type` to get the MIME type of the syntax for a parser

`raptor_parse_uri_with_connection` (which is called by `raptor_parse_uri`) now sets the HTTP `Accept:` header to the MIME type of the parser in WWW requests using the new `raptor_www_set_http_accept()`.

### `rapper` changes

Added options `-f`/`--feature` for setting features and `-g`/`--guess` for guessing syntax from some content or identifiers. See rapper(1) for all rapper options.

### Utility function changes

Added `raptor_syntax_name_check` to check for valid syntax language names.

Added `raptor_free_memory` to free memory returned by raptor functions.

Added Unicode utility functions `raptor_unicode_char_to_utf8` and `raptor_utf8_to_unicode_char`.

Exported URI string `raptor_xml_literal_datatype_uri_string`.

Deprecated `raptor_print_statement_detailed` always intended to be internal.

### WWW Class changes

Added support to set the HTTP `Accept:` header for curl and libxml2 when retrieving HTTP content by the new `raptor_www_set_http_accept` method.

### New classes - Sequence and Stringbuffer

Added a utility class `raptor_sequence` providing simple sequences that can handle stacks and queues

Added a utility class `raptor_stringbuffer` for constructing strings from substrings appended or prepended.

## Raptor 0.9.0 - Raptor 1.2.0 Changes

Release notes for 1.2.0 and earlier are in the NEWS page or ChangeLog

Copyright (C) 2003-2008 Dave Beckett
Copyright (C) 2003-2005 University of Bristol