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RDF::Trine - An RDF Framework for Perl.

   RDF::Trine provides an RDF framework with an emphasis on extensibility, API
   stability, and the presence of a test suite. The package consists of several

   * RDF::Trine::Model - RDF model providing access to a triple store.
   * RDF::Trine::Parser - Native RDF parsers (RDF/XML, RDFa, Turtle, RDF/JSON,
     TriG, N-Triples, and N-Quads).
   * RDF::Trine::Serializer, a set of native RDF serializers for RDF/XML, Turtle,
     RDF/JSON, N-Triples, Canonical N-Triples, and N-Quads.
   * RDF::Trine::Store::DBI - A triple store for MySQL and SQLite, based on the
     Redland schema.
   * RDF::Trine::Iterator - Iterator classes for variable bindings and RDF
     statements, used by RDF::Trine::Store, RDF::Trine::Model, and RDF::Query.
   * RDF::Trine::Namespace - A convenience class for easily constructing RDF
     node objects from URI namespaces.


	To install RDF::Trine you'll need the following perl modules installed:

     * Data::UUID
     * DBI
     * DBIx::Connector
     * DBD::SQLite
     * Digest::MD5
     * Error
     * HTTP::Negotiate
     * JSON
     * LWP::UserAgent
     * List::Util
     * List::MoreUtils
     * Log::Log4perl
     * Math::BigInt
     * Math::Combinatorics
     * Scalar::Util
     * Set::Scalar
     * Text::CSV
     * Text::Table
     * Time::HiRes
     * Unicode::Escape
     * Unicode::String
     * URI
     * XML::CommonNS
     * XML::Namespace
     * XML::SAX
     * XML::LibXML
     * XML::LibXML::SAX

	The following additional modules are optional:

     * DBD::Pg
     * DBD::Mysql
     * Test::More
     * Test::Exception
     * RDF::RDFa::Parser


   To install, run:

   perl Makefile.PL
   make test
   make install


  Version 0.136 (2011-10-19)

         Removed RDF::Trine::Iterator::SAXHandler->rate method and dropped dependency on Time::HiRes.
         Consolidated bnode prefix handling in parser classes, adding support for UUID::Tiny.
     * BUG FIXES
         Fixed escaping of URIs in rdf:about attributes (patch from SADI Framework).
         Return an empty string instead of undef in RDF::Trine::Iterator->format_node_xml.
         Fixed RDF::Trine::Store::SPARQL->count_statements handling of variables.
         Fixed turtle serializer to check if numerics are in canonical form.
         Fixed mysql schema to quote index names that might contain reserved characters.
         Fix RDF::Trine::Model->get_statements to throw an error when called with arguments that aren't either undef or node objects.
         Fixed titlecase of table reference in RDF::Trine::Store::DBI::mysql->init.
         Fixed bug in use of UUID::Tiny::UUID_V1 bareword in RDF::Trine::Parser->new_bnode_prefix.
         Initial support for using Dydra as a store.
         Added RDF::Trine::Parser::Turtle->parse_node method.
         Added RDF::Trine::Node::Literal->is_canonical_lexical_form.
         Made RDF::Trine::Serializer::NTriples->statement_as_string a public method.
         RDF::Trine::Parser->parse_url_into_model now fill properly fall back on guesswork when media-type parsing fails.
         Moved as_hashref functionality from RDF::Trine::Model to RDF::Trine::Iterator::Graph.
         Added TSV serializer.
         Allow empty namespace prefix in RDF::Trine::NamespaceMap (patch from Jakob Voss).
         Added text/html media type, and added use of Module::Load::Conditional in RDF::Trine::Parser::RDFa.
         Added support of SPARQL endpoints with URL parameters like Virtuoso's 'http://example.org:8890/sparql?default-graph-uri=...' (patch from Jakob Voss).
         Updated RDF::Trine::Store::DBI to use DBIx::Connector.
     * OTHER
         Added option to sleep after each store update in Test::RDF::Trine::Store.
         Fixed code in RDF::Trine::Store::SPARQL that was causing a warning when a variable name was redefined.
         Updated RDF::Trine::Store::DBI::mysql->_add_node to return the node hash value.
         Stop RDF::Trine::Store::DBI->add_statement from unnecessarily hashing nodes multiple times (patch from tobyink).
         Moved redland store tests to developer xt directory.
         Updated t/serializer-turtle.t to be more accepting of stores returning data in varying orders.
         Removed 'or die' conditional from store tests.
         Changed test endpoint from kasei.us to myrdf.us.
         Added simple store tests for bulk_ops in Test::RDF::Trine::Store.
         Removed heavy dependency on DBI store in test cases.
         Require RDF::Redland in xt/store-redland.t.
         Add missing use of RDF::Trine::Statement::Quad.
         Conditionally load DBI store, and return Memory store from temporary_store().
         Removed dependency on Unicode::Escape.
         Made XML::LibXML an optional dependency (RDF/XML parser will not perform c14n if it is not installed)
         Updated RDF::Trine::Store::Memory to use Digest::SHA instead of Digest::MD5.
         Removed depedency on List::MoreUtils.
         Added POD for Test::RDF::Trine::Store->update_sleep.
         Added POD for RDF::Trine::Serializer::NTriples->statement_as_string.
         Removed depedency on Unicode::String and List::MoreUtils.
         Removed unnecessary use statements.

  Version 0.135 (2011-04-30)

         Globally changed 'base' to 'base_uri' in Trine code and API.
         Changed name of redland rdfa parser to 'librdfa' and removed associated media type and file extensions (due to librdfa bugs).
     * BUG FIXES
         Fixed bug in RDF::Trine::Store::DBI::mysql that was causing init() to remove existing data.
         Added RDF::Trine::Store::DBI->nuke method for removing store data.
         Added RDF::Trine::Model->remove_list method (patch from tobyink).
         Added RDF::Trine::Iterator->seen_count method.
         Added RDF::Trine::Model->get_sparql delegation method.
         Updated RDF::Trine::Parser->parse_url_into_model to be better at guessing media types for file: URIs.
         Updated RDF::Trine::Parser::Redland to allow the $base argument to be a URI object.
         Updated RDF::Trine::Parser->parse_url_into_model to not catch and hide exceptions thrown from calls to parse_into_model.
         Updated bin/srx2csv to handle unbound variables in results.
         Added support for 'storeclass' key in RDF::Trine::Store->new_with_config.
         Added supports method to RDF::Trine::Model, RDF::Trine::Model::Dataset, and RDF::Trine::Store classes.
         RDF::Trine::Store->new_with_string now attempts to load store classes before using them.
         Renamed RDF::Trine::Store::SPARQL->_get_iterator to get_sparql.
     * OTHER
         Added SQL file for creating the mysql backend database.
         Remove the meaningless "All rights reserved" copyright text.
         Style changes to RDF::Trine::Iterator::Bindings->print_xml.
         Updated required version of XML::SAX to 0.96.
         Updated store tests (KjetilK).
         Removed Digest::SHA1 from list of prereq modules.

  Version 0.134 (2011-03-29)

         Deprecated RDF::Trine::Iterator->count.
     * BUG FIXES
         Fixed bug in RDF::Trine::Iterator::SAXHandler on data with empty results.
         Fixed canonicalization bug in RDF::Trine::Node::Literal for xsd:decimals with no decimal point.
         Added srx2csv and srx2table scripts.
         Added API for stream parsing of srx results to RDF::Trine::Iterator::SAXHandler.
         Added RDF::Trine::Model->get_sequence method for accessing rdf:Seq structures.
         Added 'value' method to RDF::Trine::Node subclasses for accessing the primary scalar value of a node.
         Added RDF::Trine::Graph->error method to explain failures in RDF::Trine::Graph->equal.
         Updated RDF::Trine::Graph to support: subgraph testing, access to injection map, delegation to RDF::Trine::Model (patch from tobyink).
         Fixed RDF::Trine::Node::Resource->qname handling of unicode IRIs.
         Fixed RDF::Trine::Parser::NTriples->parse_file to accept filenames just like the superclass implementation.
         Fixed RDF::Trine::Parser->parse_file to open files as utf8.
         Fixed RDF::Trine::Parser->parse_url_into_model to pass through 'canonicalize' argument to actual parser method call.
         Allow 'canonicalize' argument to RDF::Trine::Iterator->from_json method.
     * OTHER
         Made diagnostic messages less noisy in t/store-hexastore-storable.t.
         Silenced an uninitialized warning in RDF::Trine::Parser::NTriples.
         Removed use of XML::SAX in RDF::Trine::Serializer subclasses.
         Added turtle parser test for file with BOM.
         Updated RDF::Trine::Store::DBI and RDF::Trine::Store::DBI::mysql to use DBI placeholders.

  Version 0.133 (2011-02-07)

     * BUG FIXES
       Fixed bug in Turtle parser that wouldn't allow a Unicode BOM in the input.
       Fixed bug in turtle serialization of blank nodes used in graph cycles (reported by tobyink).
       Fixed bug in RDF::Trine::Serializer::RDFXML that wasn't escaping XML entities in IRIs and bnode labels (github issue 3 from nichtich).
       Updated RDF::Trine::Store::Hexastore to use equal() method instead of op<==> for testing node equality.
       Updated t/parser-rdfjson.t to test bnode equality using identifier strings, not with op<==>.
       Fixed RDF/XML xmlns serialization bug when used with RDF::Trine::NamespaceMap objects.
       Added RDF::Trine::NamespaceMap class.
       Added support to populate RDF::Trine::NamespaceMap objects during RDF parsing.
       Added RDF::Trine::Model get_list and add_list methods for managing rdf:List structures.
       Added support for parsing SPARQL JSON Results format in RDF::Trine::Iterator->from_json.
       RDF::Trine::Parser subclasses now allow parse_file_into_model and parse_file being called as class methods.
       Added 'restrict' and 'extend' options to RDF::Trine::Serializer->negotiate to allow more control over content negotiation.
       Added the ability to restrict the nodes returned from the RDF::Trine::Model->objects method by node type or by literal language/datatype.
       Updated RDF::Trine::Store::SPARQL to allow bulk-update operations.
       Added string overloading to RDF::Trine::Node subclasses.
       Added text/rdf+n3 as a media type for RDF::Trine::Serializer::Turtle.
     * OTHER
       Updated conneg code setting default q-values in RDF::Trine::Serializer.
       Updated RDF::Trine::Iterator::Graph->print_xml to set utf8 binmode on the output filehandle.
       Changed required version of Module::Load::Conditional to 0.38 (based on version in debian).

  Version 0.132 (2010-12-23)

     * Added conditional loading of Redland parsers and stores when available using Module::Load::Conditional.
     * Added auto-initialization of DBI stores during object construction.
     * Added RDF::Trine::Store->new method to delegate to existing constructors.
     * Moved slow turtle parser tests into developer tests directory xt/.

  Version 0.131 (2010-12-07)

     * Fixed SPARQL XML Results serialization to omit unbound variables and properly declare literal languages and datatypes.
     * Copied implementations of is_numeric_type() and numeric_value() from RDF::Query::Node::Literal to RDF::Trine::Node::Literal.
     * Updated documentation to explicitly discuss inherited methods due to subclassing  (RT 63153 comment from Ivan Shmakov).
     * Updated POD for RDF::Trine::Iterator subclasses (RT 63153 comment from Ivan Shmakov).
     * Fixed RDF::Trine::Parser->guess_parser_by_filename to get RDF/XML parser class from parser_by_media_type() instead of being hardcoded.
     * Fixed RDF::Trine::Serializer::Turtle::_node_concise_string to allow call as class method.
     * Added RDF::Trine::Parser::Redland subclasses to allow calling new() with no 'name' argument.
     * Added file extensions to parser registry for RDF::Trine::Parser::Redland.
     * Added RDF::Trine::Model->as_graphviz method.
     * Added checks to avoid undefined warnings in RDF::Trine::Serializer::NTriples::Canonical (suggestion from KjetilK).
     * Set :utf8 mode on string-backed filehandles in RDF::Trine::Serializer::Turtle.
     * Attempt at patching utf8 turtle/trig parsing bug submitted by KjetilK.
     * Updated required version of Test::More to 0.88 (bugreport from @danbri).

  Version 0.130 (2010-10-18)

     * Fixed bug in RDF::Trine::Node::Literal->is_valid_lexical_form check for xsd:double.
     * Updated RDF::Trine::Iterator::Bindings->as_string to use concise turtle syntax.
     * Added RDF::Trine::Parser methods media_type(), media_types(), parser_by_media_type(), and guess_parser_by_filename().

  Version 0.129 (2010-10-04)

     * Updated Makefile.PL and RDF::Trine to require perl v5.8.3.
     * Fixed bug in promotion of temporary models from memory-backed to a SQLite-backed store.
     * Fixed RDF::Trine::Store::DBI->new to bless into backend-specific classes when passed a database handle (bug report from tobyink).
     * Updated RDF::Trine::Node::Literal to produce more accurate canonical lexical forms for xsd types.
     * Added RDF::Trine::Node::Literal->is_valid_lexical_form method.
     * Added support for special union-graph 'tag:gwilliams@cpan.org,2010-01-01:RT:ALL'.
     * Added exportable constants for UNION_GRAPH and NIL_GRAPH in RDF::Trine.

  Version 0.128 (2010-09-28)

     * Added .owl as a recognized RDF/XML file extension for the fallback parser guessing code.
     * Fixed bug in RDF::Trine::Store::SPARQL preventing access to the default graph.
     * Added new_with_config method to allow interactive configuration via rqsh.pl.
     * Updated RDF::Trine::Store::DBI->init to (partially) work if called for a new model (but the database has already been initialized).
     * Fixed call to RDF::Trine::Parser->parse_into_model in bin/rdf_store_add_file.pl.
     * Fixed call to RDF::Trine::Parser->parse_url_into_model in RDF::Trine::Store::Memory.
     * Removed RDF::Redland dependency in bin/rdf_store_add_file.pl.
     * Added introspective _config_meta method to RDF::Trine::Store subclasses to allow interactive configuration.
     * Added RDF::Trine::Store->class_by_name class method.
     * Added etag method to RDF::Trine::Model and RDF::Trine::Store::Memory to allow for HTTP caching.
     * Updated RDF::Trine::Node::Literal->canonicalize_literal_value coercion of xsd:decimal values.
     * Added optional flag to RDF::Trine::Node::Literal->new to attempt to canonicalize recognized XSD values.
     * Updated RDF::Trine::Exporter::CSV to accept a graph iterator (for serializing s,p,o as CSV).
     * Added RDF::Trine::Store::DBI->clear_restrictions method (suggestion and partial patch from tobyink).
     * Updated RDF::Trine::Store::Redland to improve efficiency (based on suggestions from Dorian Taylor).
     * Added native redland parser class and tests (patch from Dorian Taylor).
     * Added RDF::Trine::Iterator->each method (requested by tobyink).
     * Made code updates to improve performance based on profiling.
     * Updated to use URI 1.52 to allow direct usage of IRIs without unicode workarounds.
     * Added content-sniffing to fallback parser guessing code for RDF/XML and Turtle.
     * Lowered required version of redland in RDF::Trine::Parser::Redland to
     * Added RDF::Trine::Serializer->serializer_names method for listing available serializers.
     * Added as_string method to RDF::Trine::Iterator::Boolean and RDF::Trine::Iterator::Graph.

  Version 0.127 (2010-08-30)

     * Removed redundant prerequisite for XML::LibXML::SAX from Makefile.PL.
     * RDF::Trine::Model->bounded_description now catches and ignores UnimplementedError exceptions.
     * Added heuristics support for TriG, RDF/JSON, and N-Quads to RDF::Trine::Parser->parse_url_into_model.
     * Added ability to specify the base URI for serializing RDF/XML and Turtle (patch from KjetilK).

  Version 0.126 (2010-08-16)

     * Fixed N-Triples serialization escaping bug for strings whose only escapable character is '\'.
     * Fixed typo in handling of RDF::Trine::Node::Formula extension.
     * RDF::Trine::Model->new will now return a temporary model when called with no arguments.
     * Updated get_pattern methods in Model and Store classes to return VariableBindings objects.
     * Updated DBI backend to allow no-op adding of the nil node.
     * Updated SPARQL backend to use SPARQL 1.1 Update and Aggregate operations.
     * Updated Memory and Hexastore backends to support 'graph' key in _new_with_config().
     * Improved error messages in N-Triples and N-Quads parsers.
     * Fixed column naming bug in RDF::Trine::Store::DBI->get_contexts.
     * Added begin_bulk_ops() and end_bulk_ops() hint methods to RDF::Trine::Model.
     * Updated RDF::Trine::Parser to call begin_bulk_ops() and end_bulk_ops() on model object.
     * Updated DBI backend to use transactions when bulk_ops hints are used.
     * Added '==' and 'eq' overloading to RDF::Trine::Graph class.
     * Updated RDF::Trine::Model->bounded_description to traverse backwards links across blank nodes.

  Version 0.125 (2010-07-29)

     * Fixed hash collision bug in RDF::Trine::Store::DBI handling of literals with values '' and '0'.
     * Added RDF::Trine::VariableBindings class (ported from RDF::Query).
     * Iterators constructed from SPARQL XML Results format now return variable bindings objects.
     * Turtle serialization to strings now only declares prefixes that are used in the data.
     * Added media types and URIs for N-Quads parser and serializer.
     * Added RDF::Trine::Statement->rdf_compatible method (patch from tobyink).
     * Changed RDF::Trine::Model node methods (subjects, predicates, objects) to use quad semantics and accept a graph parameter.
     * Add documentation for new_with_object.
     * Add documentation for the hashref config.
     * Improved efficiency of counting quad patterns in RDF::Trine::Store::DBI.
     * Fixed bug in N-Triples serializer (was serializing quads).
     * Added %format_uris registry for parsers and serializers.
     * Added RDF::Trine::Model::as_string method.
     * Require XML::LibXML 1.70.
     * Removed unused variable in RDF::Trine::Parser::RDFXML.
     * Added character encoding declaration to RDF::Trine::Iterator::Bindings->print_xml.
     * Added character encoding declaration to RDF::Trine::Iterator::Boolean->print_xml.

  Version 0.124 (2010-06-21)

     * Updated quality value heuristics in RDF::Trine::Serializer::negotiate to prefer turtle if no accept headers are supplied.
     * Added ability for RDF::Trine::Store::Memory to load RDF files by URI in _new_with_string.
     * Added default implementation of RDF::Trine::Serializer::serialize_iterator_to_file.
     * RDF::Trine::Serializer::negotiate now slightly prefers turtle.
     * Added RDF::Trine::Iterator->count method.
     * Fixed RDF::Trine::Iterator::Bindings::as_string to respect $max_result_size argument.
     * RDF::Trine::Iterator::Bindings::as_string now returns unescaped strings.
     * Added ability to access the number of rows returned from RDF::Trine::Iterator::Bindings::as_string.
     * Updated RDF::Trine::Parser::parse_url_into_model to fall back on file extension heuristics if the media-type based parse fails.
     * Updated RDF::Trine::Parser::RDFJSON to throw an error if input isn't valid JSON.
     * Updated RDF::Trine::Model to throw an error if not passed a store object.
     * Added RDF::Trine::Model::Dataset for constructing views over a model, and RDF::Trine::Model->dataset_model constructor method.
     * Fixed bug in handling of quads in RDF::Trine::Model::get_pattern and RDF::Trine::Store::get_pattern.
     * Updated RDF::Trine::Store::DBI and RDF::Trine::Store::Memory to not return the default (nil) context from get_contexts.
     * Fixed bug in RDF::Trine::Store::Memory::_get_statements_quad that would infinite loop after removing statements.
     * RDF::Trine::Store doesn't load RDF::Redland (now only checks if it is already loaded).
     * Fixed bug in RDF::Trine::Store subclasses registering their class names in %STORE_CLASSES.
     * Added missing use of Encode to RDF::Trine::Store::Redland.
     * Made $RDF::Trine::Store::Redland::NIL_TAG globally accessible.
     * Added bin/rdf_transcode.pl for (streaming) conversion between RDF serialization formats.
     * Updated POD tests to not use taint mode (and synced between R::T and R::Q).
     * Changed test data in t/iterator-thaw.t.
     * Removed RDF::Core as a prerequisite in META.yml.
     * Added default implementation of RDF::Trine::Serializer::serialize_iterator_to_file.
     * RDF::Trine::Serializer::negotiate now slightly prefers turtle.

  Version 0.123 (2010-05-13)

     * Added turtle utf8 decoding for Turtle parser.
     * Added RDF::Trine::Serializer::media_types method.
     * Added RDF::Trine::Store::new_with_object method.
     * Fixed unicode encoding bug in RDF::Trine::Store::DBI.
     * RDF::Trine::Serializer::NTriples::Canonical.pm now inherits from RDF::Trine::Serializer::NTriples.
     * Cleaned up VERSION declarations.
     * Updated RDF::Trine::Parser::parse_url_into_model to fall back on file extension heuristics if the media-type based parse fails.
     * Updated RDF::Trine::Parser::RDFJSON to throw an error if input isn't valid JSON.
     * Added character decoding to RDF::Trine::Parser->parse_url_into_model.

  Version 0.122 (2010-05-05)

     * Added RDF::Trine::Model::bounded_description method.
     * Added initial implementation of a Redland-based storage class.
     * Fixed SPARQL store tests to align with recent coverage efforts.
     * Code cleanup and updates to improve test coverage.
     * Rearranged POD in RDF::Trine::Parser.
     * Fixed type in RDF::Trine::Node::Literal::_compare.

  Version 0.121 (2010-04-29)

     * Fixed URI qname code to disallow ':' in local name.
     * Added node-centric methods to RDF::Trine::Model: subjects, predicates, objects.
     * Improved POD for value canonicalization in RDF::Trine::Parser.
     * Added POD for RDF::Trine::Model::get_contexts.
     * Added POD details to RDF::Trine::Model::get_statements regarding triple and quad semantics.

  Version 0.120 (2010-04-20)

     * Added optional value canonicalization on parsing (xsd integer, decimal, and boolean).
     * RDF/XML parser now attempts to canonicalize XMLLiterals (doesn't yet canonicalize all XMLLiterals that it shold).
     * Added RDF::Trine::Node::Blank::_new constructor that doesn't validate bnode name for N-Triples conformance.
     * Performance improvements to RDF::Trine::Node::_unicode_escape.
     * Updated Turtle parser to throw error on undeclared namespace prefixes.
     * Updated Turtle serializer to produce QName literal datatypes.

  Version 0.119 (2010-04-15)

     * Fixed bug in NTriples parser handling of language literals (reported by tobyink).
     * Fixed another bug in turtle serializer that improperly serialized bnode objects 'belonging' to a parent triple (in-edge count of 1).

  Version 0.118 (2010-03-22)

     * Added RDF::Trine::Parser::TriG.
     * Added RDF::Trine::Parser::parse_file_into_model method.
     * Added RDF::Trine::Serializer::NQuads.
     * Added RDF::Trine::Serializer::negotiate constructor.
     * Added RDF::Trine::Serializer::new constructor based on requested serializer name.
     * Added RDF::Trine::Exporter::CSV for serializing variable bindings.
     * Added Text::CSV and HTTP::Negotiate to RDF::Trine prereq list.
     * Fixed exception thrown on unrecognized parser name.
     * Removed dependency list and added perlrdf link to POD in RDF::Trine and RDF::Query.
     * Updated RDF::Trine::Serializer::Turtle->new API to take %args instead of \%namespaces.
     * Updated RDF::Trine::Serializer::RDFXML to take %args and properly accept and serialize xmlns namespaces.
     * Updated RDF::Trine::Parser::RDFa to use streaming parsing (instead of materializing the graph first).
     * Updated RDF::Trine::Model::_debug to use quad semantics when getting statement iterator.
     * Updated t/parser-turtle.t to use File::Glob::bsd_glob for cases where the test directory's path contains whitespace.
     * Removed redundant parse_into_model methods from RDF::Trine::Parser subclasses.
     * Renamed examples/create_store.pl to examples/foaf_labels.pl.
     * Fixed bug in turtle serializer that improperly serialized bnode objects 'belonging' to a parent bnode.

  Version 0.117 (2010-02-04)

     * Fixed bug in RDF::Trine::Iterator::Bindings::as_json when using empty iterator.

  Version 0.116 (2010-01-31)

     * Fixed bug in RDF::Trine::Serializer::RDFXML when serializing empty models.

  Version 0.115 (2010-01-30)

     * Added N-Triples and N-Quads parsers.
     * Added RDF::Trine::Store::SPARQL::get_pattern implementation.
     * Changed RDF::Trine::Model::objects_for_predicate_list to return only a single node in scalar context.
     * Added table alias for COUNT(*) queries in RDF::Trine::Store::DBI (fix for mysql).
     * Added example of using parse_url_into_model to RDF::Trine::Parser SYNOPSIS.

  Version 0.114 (2010-01-27)

     * Added new Turtle serializer.
     * Updated RDF/XML serializer grouping of same-subject statements for bounded descriptions.
     * Updated parse_into_model parser methods to be both class and object methods.
     * Updated Parser parse_* methods to take extra %args with optional 'context' value.
     * Moved RDF::Trine::Store::Hexastore from alpha/ directory into RDF::Trine package.
     * Added Storable to list of prereq modules.
     * Added partial support for rdf:Lists to RDF::Trine::Serializer::Turtle.
     * Added RDF::Trine::Namespace::uri_value method.
     * Updated unicode encoding and escaping in ::Node, ::Node::Literal, and ::Store::DBI.
     * Added variable() shortcut function to RDF::Trine package.
     * Updated RDF::Trine::Graph to materialize statements when constructed with a graph iterator.
     * Moved get_pattern logic from ::Store to ::Model.
     * Updated ::Model::Union to work better with ::Model::get_pattern.
     * Updated Node and Statement from_sse methods to work with constant string arguments.
     * Updated code and tests for better coverage.
     * Removed unused RDF::Trine::Iterator::sfinally function.
     * Fixed bug in RDF::Trine::Graph::equals.
     * Added UnimplementedError exception class.

  Version 0.113 (2009-12-30)

     * Added RDF::Trine::Parser::RDFa implementation to connect with RDF::RDFa::Parser.
     * Added ability to pass RDF::Trine::Node::Resource values as the datatype argument to RDF::Trine::Node::Literal::new().
     * Special-cased 'xsd' in RDF::Trine::Namespace to return the RDF-version of the namespace URI (with trailing '#').
     * Added syntax shortcuts as exportable from RDF::Trine: iri(), blank(), and literal().
     * Added RDF::Trine::Serializer base class.
     * Fixed syntax error in generated RDF/XML in RDF::Trine::Serializer::RDFXML.
     * Fixed bug in RDF::Trine::Serializer::RDFXML that was dropping triples.
     * Added RDF::Trine::Parser::parse_url_into_model class method.
     * Updated parser classes' registration of parser names and media types.
     * Added RDF::Trine::Model::size method.
     * Removed ::Parser::Error package. Replaced with use of RDF::Trine::Error.
     * Convert data to utf8 encoding before hashing in RDF::Trine::Store::DBI::_mysql_hash_pp.
     * Added RDF::Trine::Model::objects_for_predicate_list method.
     * Removed RDF::Trine::Serializer::RDFXML::_split_predicate and replaced with call to $pred->qname.
     * Added RDF::Trine::Node::Resource::qname method to split an IRI into namespace and local parts.
     * Added RDF::Trine::Serializer::NTriples::Canonical (from tobyink).
     * Added RDF::Trine::Iterator::Bindings::as_statements to return a graph iterator.
     * Updated POD for ::Model::get_pattern to mention 'orderby' argument.
     * Updated ::Model::as_stream to return a graph iterator sorted by (s,p,o).
     * Updated RDF/XML serializer to merge same-subject rdf:Descriptions.

  Version 0.112 (2009-12-12)

     * Skip some failing tests when RDF::Trine::Node::Literal::XML is loaded.
     * Added RDF/XML serializer.
     * Added serialize_iterator_to_file and serialize_iterator_to_string methods to NTriples serializer.
     * Added _serialize_bounded_description method to NTriples serializer.
     * Added RDF::Trine::Parser::RDFJSON package (patch from tobyink).
     * Added RDF::Trine::Serializer::RDFJSON package (patch from tobyink).
     * Added add_hashref and as_hashref methods to RDF::Trine::Model (patch from tobyink).
     * Added tests for RDF/JSON parsing/serializing (patch from tobyink).
     * Updated RDF::Trine docs to mention the RDF/XML parser (good catch by tobyink).
     * Added logging code to RDF::Trine::Store::DBI.
     * Changed ::Store::DBI::get_statements to skip (with warning) past ill-formed statements with IDs that don't appear in any of the value tables.
     * Updated RDF::Trine::Serializer::NTriples to call as_ntriples on node objects during serialization.
     * Added as_ntriples methods to RDF::Trine::Node and subclasses for proper NTriples formatting.
     * Updated bin/rdf_store_serialize.pl to print in NTriples format.

  Version 0.111 (2009-07-14)

     * Added RDF::Trine::Graph for testing graph equality.
     * Added node_names() method to ::Statement and ::Statement::Quad.
     * Added RDF::Trine::Statement::has_blanks method.
     * Fixed bug in RDF::Trine::Namespace to allow subclassing.
     * Removed dependency on Test::JSON, List::MoreUtils, and XML::Parser.
     * Added POD to RDF::Trine::Parser.
     * RDF::Trine::Store::temporary_store now delegates to RDF::Trine::Store::DBI.
     * Removed unnecessary call to blessed() in RDF::Trine::Statement.
     * Removed unused RDF::Trine::Promise class.
     * RDF::Trine now loads RDF::Trine::Store.
     * Removed TODO labeling of tests in t/model-filter.t.

  Version 0.110 (2009-03-14)

     * Added RDF::Trine::Store base class with default implementation of get_pattern().
     * Updated bin/rdf_store_add_file.pl to use the RDF::Trine parser, not Redland's parser.
     * Added POD description to RDF::Trine package.
     * Updated VERSION variables to 0.109 (forgotten during the last release).
     * Updated ::Iterator::Bindings::as_string to join lines with empty string (had been returning a list).
     * Added debug tracing code to ::Store::DBI.
     * Updated schema in ::Store::DBI::mysql to use utf8 charset and collation, and use a pkey instead of a unique.
     * RDF::Trine::Store::get_pattern now passes through optional @args (used for order-by).
     * Fixed bug in ::Store::DBI::remove_statements causing bad SQL when all nodes are undef (remove all triples).
     * ::Node::Literal::new now calls ::Node::Literal::XML::new if available and applicable.

  Version 0.109 (2008-11-14)

     * Removed incremental parsing code from RDF-Trine package.
     * Added POD to from_sse methods in ::Node and ::Statement.
     * Added parsing of variables to RDF::Trine::Node::from_sse.
     * Small changes to ::Iterator and ::Trine::Node::Literal for efficiency.
     * Whitespace updates to ::Trine::Node.
     * Added SQLite-specific ::Store::DBI subclass so that indexes are created properly.
     * Fixed bug in RDF::Trine::Iterator::Bindings::print_xml that dropped every other row.
     * Updated RDF::Trine::Node::Resource to work with URI objects.
     * rdf_parse_turtle.pl now warns on any parser error.
     * RDF::Trine::Node::Resource now escapes unicode in base URIs (now just relative URI part) before calling URI->new_abs.
     * Turtle parser now makes universal IDs for all blank node (even those with given IDs like _:xyz).
     * Fixed Unicode unescaping in Turtle parser's handling of string literals.
     * Turtle parser now doesn't modify the lexical value of numeric typed literals.
     * Fixed ::Store::DBI handling of Quads in get_statements (had been broken because RDF::Query bypasses it by using get_pattern).
     * Fixed bug in ::Iterator::Bindings::print_xml that would drop every other result.
     * Updated VERSION numbers and docs for RDF::Trine for 0.109_01 candidate release.
     * ::Store::DBI now throws an error if call to DBI->connect doesn't return a database handle.
     * ::Iterator::Bindings::as_string now returns '' when there are no rows (instead of dying).
     * Added $IGNORE_CLEANUP to ::Store::DBI to allow preventing DBI cleanup.
     * ::Store::DBI now throws an error if call to DBI->connect doesn't return a database handle.
     * ::Iterator::Bindings::as_string now returns '' when there are no rows (instead of dying).
     * Moved all debugging over to use Log::Log4perl.
     * Updated prerequisite list (removed Digest::SHA1 and XML::Parser, and added missing modules).

  Version 0.108 (2008-07-14)

     * Added NTriples serializer module.
     * Added POD to RDF::Trine::Promise.
     * Added XML::Parser to list of required modules.
     * Added a peek method to ::Iterator to support execution deferment like in ::Algebra::Service.
     * Added RDF::Trine::Promise for general computation deferment.
     * Added print_xml method to RDF::Trine::Iterator classes.
     * Added support for Postgres storage.
     * Added XML::LibXML::SAX as a prerequisite (because XML::SAX::PurePerl can't handle some RDF/XML that uses unicode).
     * Replaced RDF::Core-based RDF/XML parser with a new XML::SAX based parser.
     * Removed now unused redland-based RDF/XML test data.
     * Removed unused redland fallback code from RDF::Query::Model::RDFTrine.
     * Removed redland-based RDF/XML parser tests.
     * Updated Turtle grammar to accept uppercase language tags.
     * Fixed COLLECTION support in RDF/XML parser.
     * Fixed RDF/XML parser for nodeID, sequence, reification, and base URI handling.
     * Fixed POD in NTriples serializer.
     * Fixed RDF/XML parser to handle nodeID, arbitrary xml attributes, parseType="Literal" serialization, and base URI handling.
     * Normlized expected NTriples data in W3C RDF/XML test files.
     * Added unicode escaping to Literal and Resource sse serialization.
     * Added W3C RDF/XML data and test script.
     * Fixes to deferring XML serialization for SPARQL bindings.
     * Fixed bug in delaying XML serialization for identity hints header computation.
     * Fixed extra data following xml query results.
     * Fixed strict refs bug in print_xml in iterator classes.
     * Updated tests that started failing after the previous commit (affecting SQL-compilation).
     * Allow equality test and disjunction filters in patterns that can be compiled to SQL.
     * Fix bug in SQL compilation when restricting left-joins to specific node types (based on functions like isIRI).
     * Added support to the DBI store for filters for equality tests.
     * Mysql store schema now adds indexes.
     * Improved use of temporary RDF::Trine stores in RDF::Query tests.
     * DBI temporary stores now use an in-memory SQLite database.
     * Fixed bug in RDF::Trine::Store::DBI::mysql (calling _mysql_hash() without qualifying it in the superclass).
     * Fixed variable ordering bug in UNION to SQL handling by forcing a sorted projection order.
     * Added support to compile normalized UNION (can only be the top-level node or a child of another UNION) patterns to SQL.
     * Made SQL more standards compliant.
     * RDF::Trine::Store::DBI now auto-upgrades to mysql and postgres classes.
     * Fixed unicode escaping by replacing Unicode::Escape calls to hand-rolled code in RDF::Trine::Node.
     * RDF/XML parser now accept more than one top-level resource.
     * RDF/XML parser now accepts URI objects as base uri (not just RDF::Trine::Node::Resource objects).
     * Added tabular as_string serialization of ::Iterator::Bindings objects.
     * Added Text::Table as a prerequisite.
     * Fixed RDF/XML parser handling of strings (versus file handles).
     * Fixed Turtle parser to properly keep '+' on integer literals.
     * Fixed bindings_count so it doesn't pull a result from the stream (basing the count on binding_names).
     * Fixed bindings xml serialization whitespace formatting.
     * Cleaned up ::Iterator::Bindings::as_string serialization code.
     * Replaced use of splice() with shift() in ::Iterator::SAXHandler::pull_result.

  Version 0.107 (2008-04-25)

     * Added Digest::SHA1 as a requirement for RDF::Trine.
     * Fixed base URI use in Turtle parser.
     * Fixed SQLite DSN in example scripts.
     * Fixed XML whitespace error in iterator-thaw.t

  Version 0.106 (2008-04-19)

     * Added a mysql-specific RDF::Trine::Store class (now uses INSERT IGNORE for efficiency).
     * SQL compiler now doesn't select statement contexts unless called via get_statements (not get_pattern).
     * RDF::Trine::Iterator::Graph::as_bindings now can be called with no arguments (uses default names).
     * Moved the nested hash join from ::Iterator to ::Iterator::Bindings.
     * Added new tests to improve coverage of node and iterator classes.
     * Added tests for binding iterator cartesian product join.
     * Pipelined the code for nested loop joins on binding iterators.
     * Added SPARQL XML Results test for identity hints in <link/> element.
     * Fixed bug in ::Model::StatementFilter to call join_steams in ::Iterator::Bindings.
     * Fixed bug in ::Iterator::Graph::as_bindings where not all arguments are ::Node::Variable objects.
     * Updated SPARQL XML Results namespace for boolean iterators.
     * Replaced XML::Twig code with new XML::SAX parser (allowing streaming parsing).
     * Moved as_sparql methods from RDF::Trine:: to RDF::Query:: classes.
     * RDF::Trine::Iterator::smap now allows overriding default construct_args (e.g. binding names).
     * Fixed RDF::Trine::Model::StatementFilter::get_pattern to project away unused variables (fixing a bug that caused joining to always fail).
     * Updated example turtle parser to accept URLs as command line arguments.
     * Turtle parser now removes dashes from the UUIDs used for blank node IDs.
     * Added support to incrementally thaw an Iterator from an IO::Socket.
     * Added RDF::Trine::Iterator::SAXHandler::rate method.
     * Added Time::HiRes as prerequisite to META.yml and Makefile.PL.
     * Updated all RDF::Trine modules to use consistent VERSION number for 0.106 release.
     * Added examples directory (and an example script) to the RDF-Trine package.
     * Removed Bloom::Filtere from the list of prerequisites (functionality has moved to RDF::Query).

  Version 0.105 (2008-03-19)

     * Removed use of File::Slurp in parser tests.

  Version 0.104 (2008-03-14)

     * Updated SPARQL XML Results namespace declaration in RDF::Trine::Iterator serialization methods.
     * Added extra_result_data methods to add data to the XML Results <link/> header tag.
     * RDF::Trine::Node::Resource now serializes to QName when passed valid namespace data.
     * Fixed xml results serialization for style.

  Version 0.103 (2008-03-10)

     * Updated to recognize (renamed) RDF::Query::Expression class.

  Version 0.102 (2008-03-07)

     * Added length() method to Materialized bindings iterator class.
     * Removed bloom filter construction from bindings iterator (RDF::Query code now does this itself).
     * Fixed escaping of backslashes in Literal node serialization.

  Version 0.101 (2008-03-04)

     * Added an RDF/XML parser based on RDF::Core::Parser.
     * Added Bloom filter support for Materialized bindings iterators.
     * Fixed IRI workaround using the URI module.
     * Turtle parser now uses Data::UUID for unique names.
     * Fixed turtle parser bug for Verb testing.
     * Added RDF::Trine::Statement::Quad::from_redland method.
     * DBI store now constrains variable node types based on position in a statement.
     * Added support for BOUND(), ISLITERAL(), ISURI() and ISIRI() functions in DBI store.

  Version 0.100 (2008-02-18)

     * Initial public release.


   Copyright (C) 2008-2010 Gregory Williams. All rights reserved.
   This program is free software; you can redistribute it and/or
   modify it under the same terms as Perl itself.


	Gregory Williams <gwilliams@cpan.org>