Matters

NG4J - Named Graphs API for Jena: "The Named Graphs API for Jena (NG4J) is an extension to the Jena Semantic Web framework for parsing, manipulating and serializing sets of Named Graphs.
NG4J V0.3 extends Jena with:
- graph-centric methods for manipulating sets of Named Graphs
- quad-centric methods for manipulating sets of Named Graphs
- viewing graphsets as Jena models and Jena graphs
- provenance-enabled Jena statements
- querying of Named Graphs with the TriQL query language
- integrated parser and serializer for the TriX syntax including XSLT syntactic extensions
- integrated parser and serializer for the TriG syntax
- in-memory or database-persisted graphset storage
- directory reader for importing existing RDF files.
- directory writer for serializing graph sets a classic RDF files.
NG4J is an exerimental implementation of the new syntaxes (TriX, TriG) and query language (TriQL) developed within the Semantic Web Interest Group. "