RDFFilter 1.0alpha

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Date:       Mon, 13 Mar 2000 12:19:01 -0500 (EST)
From:       David Megginson <david@megginson.com>
To:         xml-dev@xml.org
Subject:    ANN: RDFFilter 1.0alpha

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I'm happy to announce the first release of RDFFilter 1.0alpha, a Java- and SAX2(beta)-based package for processing RDF documents, together with a small bundled RDF test suite. Download information is available at:

     http://www.megginson.com/Software/.

RDFFilter uses a relatively simple callback-based interface, and unlike DATAX, it doesn't build any in-memory trees, so it's suitable for use with very large documents.

The callback interface looks like this:

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  public interface RDFHandler
  {
      public static final String featureName =
	  "http://megginson.com/sax/features/rdf";
      public static final String propertyName =
	  "http://megginson.com/sax/properties/rdf-handler";

      public final static int SUBJECT_URI = 1;
      public final static int SUBJECT_URI_PATTERN = 2;
      public final static int SUBJECT_DISTRIBUTED = 3;
      public final static int SUBJECT_GENERATED = 4;

      public abstract void literalStatement (int subjectType,
					     String subject,
					     String predicate,
					     String object,
					     String language)
	  throws SAXException;

      public abstract void resourceStatement (int subjectType,
					      String subject,
					      String predicate,
					      String object)
	  throws SAXException;

      public abstract void startXMLStatement (int subjectType,
					      String subject,
					      String predicate,
					      String language)
	  throws SAXException;

      public abstract void endXMLStatement ()
	  throws SAXException;
  }

For literal XML content (parseType="Literal"), and non-RDF XML content outside of rdf:RDF, the filter uses regular SAX2 ContentHandler callbacks. There is a simple front-end for people who don't want to have to learn how to set up all the SAX2 stuff.

All the best,

David

David Megginson                 david@megginson.com
           http://www.megginson.com/

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