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DPOKORNY / RDF-Core-0.51 / doc / RDF-Core.html 
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<TITLE>RDF::Core - An object oriented Perl module to supprt RDF.</TITLE>
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	<LI><A HREF="#name">NAME</A></LI>
	<LI><A HREF="#release">RELEASE NOTE</A></LI>
	<LI><A HREF="#modules">MODULES</A></LI>
	<LI><A HREF="#license">LICENSE</A></LI>
	<LI><A HREF="#author">AUTHOR</A></LI>
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<H1><A NAME="name">NAME</A></H1>
<P>RDF::Core - An object oriented Perl module to support RDF.</P>
<P>
<HR>
<H1><A NAME="release">RELEASE NOTE</A></H1>

RDF::Core is a pure perl implementation of RDF storage, parser and serializer.
The storage's functionality is basic - store, delete, query statements, 
where query means ask about existence or count or retrieve statements 
conforming given mask of (subject, predicate, object). Three storages are 
available - in memory, file (DB_File) and DBMS (PostgreSQL). The parser 
supports full RDF/XML syntax including aboutEach attribute. The serializer 
tries to preserve anonymous nodes and to compact xml a bit by grouping 
statements with common subject. 

<P>

Besides the basic querying, there is a query language implemented. The
query language is focused on resource, not statement and the typical
pattern is me->neighbor->child->age to express neighbour's children's
age, not (me,neighbour, him) && (him, child, it) && (it, age,
value). It contains some shortcuts to express things, that are
(possibly) expressed often, like object->rdf:type = someClass. Functions are 
another enhancement of the language. They can be used instead of
resource or property. Functions are implemented in a separated
library, so that it's easy to create new or modify existing ones.

<P>

We focus on acceptable and clean interface between parts of the module. 
Typically a storage should have it's interface on a 'statement level' 
(add statement, get statement) rather then on data elements level (add this 
value into hash_one and that into hash_two), which comes with interface based 
on lower level base.
<P>
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<H1><A NAME="modules">MODULES</A></H1>
<P>RDF::Core includes the following modules. See documentation for particular 
modules for details:</P>
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<LI><A HREF="RDF/Core/Model.pm.html"><STRONG>RDF::Core::Model</STRONG></A><BR>
Model provides interface to store RDF statements, ask about them (in a very simple manner yet) and retrieve them back.
<P></P>

<UL>

<LI><A HREF="RDF/Core/Model/Parser.pm.html"><STRONG>RDF::Core::Model::Parser</STRONG></A><BR>
Model::Parser is a simple interface object to a parser. It's purpose is to provide a prototype of object accomodating any other parser.
<P></P>

<LI><A HREF="RDF/Core/Model/Serializer.pm.html"><STRONG>RDF::Core::Model::Serializer</STRONG></A><BR>
Model::Serializer is an interface object for serializer.
<P></P>

</UL>


<LI><A HREF="RDF/Core/ModelSet.pm.html"><STRONG>RDF::Core::ModelSet</STRONG></A><BR>
An RDF model set.
<P></P>

<LI><A HREF="RDF/Core/Parser.pm.html"><STRONG>RDF::Core::Parser</STRONG></A><BR>
Generates statements from an RDF XML document.
<P></P>

<LI><A HREF="RDF/Core/Schema.pm.html"><STRONG>RDF::Core::Schema</STRONG></A><BR>
The RDF Schema access.
<P></P>

<LI><A HREF="RDF/Core/Serializer.pm.html"><STRONG>RDF::Core::Serializer</STRONG></A><BR>
Serializes RDF Model into XML.
<P></P>

<LI><A HREF="RDF/Core/Storage.pm.html"><STRONG>RDF::Core::Storage</STRONG></A><BR>
An object for storing statements. There are several implementations of Storage - in memory, in a BerkeleyDB 1.x (DB_File) files and PostgreSQL database.
<P></P>

<UL>

<LI><A HREF="RDF/Core/Storage/DB_File.pm.html"><STRONG>RDF::Core::Storage::DB_File</STRONG></A><BR>
Berkeley DB 1.x implementation of RDF::Core::Storage.
<P></P>

<LI><A HREF="RDF/Core/Storage/Memory.pm.html"><STRONG>RDF::Core::Storage::Memory</STRONG></A><BR>
An in-memory implementation of RDF::Core::Storage.
<P></P>

<LI><A HREF="RDF/Core/Storage/Postgres.pm.html"><STRONG>RDF::Core::Storage::Postgres</STRONG></A><BR>
PostgreSQL implementation of RDF::Core::Storage.
<P></P>

</UL>

<LI><A HREF="RDF/Core/Enumerator.pm.html"><STRONG>RDF::Core::Enumerator</STRONG></A><BR>
Enumerator is a result set of statements retrieved from Model
<P></P>

<UL>

<LI><A HREF="RDF/Core/Enumerator/DB_File.pm.html"><STRONG>RDF::Core::Enumerator::DB_File</STRONG></A><BR>
Enumerator that can be used with the DB_File storage.
<P></P>

<LI><A HREF="RDF/Core/Enumerator/Memory.pm.html"><STRONG>RDF::Core::Enumerator::Memory</STRONG></A><BR>
Enumerator that can be used with the Memory storage.
<P></P>

<LI><A HREF="RDF/Core/Enumerator/Postgres.pm.html"><STRONG>RDF::Core::Enumerator::Postgres</STRONG></A><BR>
Enumerator that can be used with the PostgreSQL storage.
<P></P>

</UL>

<LI><A HREF="RDF/Core/Query.pm.html"><STRONG>RDF::Core::Query</STRONG></A><BR>
Implementation of query language
<P></P>

<LI><A HREF="RDF/Core/Evaluator.pm.html"><STRONG>RDF::Core::Evaluator</STRONG></A><BR>
Evaluator gets a query object that RDF::Core::Query parsed and evaluates the query. 
<P></P>

<LI><A HREF="RDF/Core/Function.pm.html"><STRONG>RDF::Core::Function</STRONG></A><BR>
A package of functions for query language.
<P></P>

<LI><STRONG>Basic elements</STRONG><BR>
<P></P>

<UL>

<LI><A HREF="RDF/Core/NodeFactory.pm.html"><STRONG>RDF::Core::NodeFactory</STRONG></A><BR>
Produces literals and resources, generates URI for anonymous resources.
<P></P>

<LI><A HREF="RDF/Core/Node.pm.html"><STRONG>RDF::Core::Node</STRONG></A><BR>
An ancestor of RDF::Core::Resource and RDF::Core::Literal.
<P></P>

<LI><A HREF="RDF/Core/Resource.pm.html"><STRONG>RDF::Core::Resource</STRONG></A><BR>
A resource for RDF statement.
<P></P>

<LI><A HREF="RDF/Core/Literal.pm.html"><STRONG>RDF::Core::Literal</STRONG></A><BR>
A literal value for RDF statement.
<P></P>

<LI><A HREF="RDF/Core/Statement.pm.html"><STRONG>RDF::Core::Statement</STRONG></A><BR>
An RDF statement.
<P></P>

</UL>

</UL>
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<H1><A NAME="license">LICENSE</A></H1>
<P>This package is subject to the MPL (or the GPL alternatively).</P>
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<H1><A NAME="author">AUTHOR</A></H1>
<P>Ginger Alliance, <A HREF="mailto:rdf@gingerall.cz">rdf@gingerall.cz</A></P>
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