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
   components:

   * RDF::Trine::Model - RDF model providing access to a triple store.
   * RDF::Trine::Parser - Native RDF parsers (currently for Turtle only).
   * 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.

REQUIREMENTS

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

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


  The following additional modules are optional:

     * DBD::Pg
     * DBD::Mysql
     * Test::More
     * Test::JSON
     * Test::Exception

INSTALLATION

   To install, run:

   perl Makefile.PL
   make
   make test
   make install

VERSION HISTORY

  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

   Copyright (C) 2008 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.

AUTHOR

  Gregory Williams <gwilliams@cpan.org>