Index: src/nongnu/cashews/rdf/Graph.java
===================================================================
RCS file: /share/darwin/darwin4/cvs/java/src/nongnu/cashews/rdf/Graph.java,v
retrieving revision 1.2
diff -u -3 -p -u -r1.2 Graph.java
--- src/nongnu/cashews/rdf/Graph.java	2005/02/01 01:05:47	1.2
+++ src/nongnu/cashews/rdf/Graph.java	2005/02/03 00:31:11
@@ -52,4 +52,35 @@ public class Graph
    */
   private Set graph;
 
+  /**
+   * Returns true if the specified object is either of type <code>Graph</code>,
+   * or a sub-type, and contains an equivalent set of triples.  If the
+   * specified object is null, false is returned.
+   *
+   * @param obj the object to compare this object with.
+   * @return true if the two objects are equivalent.
+   */
+  public boolean equals(Object obj)
+  {
+    if (obj == null)
+      return false;
+    if (getClass() == obj.getClass())
+      {
+	Graph g = (Graph) obj;
+	return graph.equals(g.getGraph());
+      }
+    else
+      return false;
+  }
+
+  /**
+   * Returns the graph of RDF triples.
+   *
+   * @return a graph of RDF triples.
+   */
+  public Set getGraph()
+  {
+    return graph;
+  }
+
 }
Index: src/nongnu/cashews/rdf/Literal.java
===================================================================
RCS file: Literal.java
diff -N Literal.java
--- /dev/null	Thu Feb  3 00:00:04 2005
+++ Literal.java	Thu Feb  3 00:31:11 2005
@@ -0,0 +1,35 @@
+/* Literal.java -- Representation of a RDF literal.
+   Copyright (C) 2005  The University of Sheffield.
+
+This file is part of the CASheW-s editor.
+
+The CASheW-s editor is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+The CASheW-s editor is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with The CASheW-s editor; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+*/
+
+package nongnu.cashews.rdf;
+
+/**
+ * <p>
+ * This interface represents an RDF literal.
+ * </p>
+ *
+ * @author Andrew John Hughes (address@hidden)
+ */
+public class Literal
+  implements RDFObject
+{
+
+}
Index: src/nongnu/cashews/rdf/RDFURI.java
===================================================================
RCS file: RDFURI.java
diff -N RDFURI.java
--- /dev/null	Thu Feb  3 00:00:04 2005
+++ RDFURI.java	Thu Feb  3 00:31:11 2005
@@ -0,0 +1,46 @@
+/* RDFURI.java -- Representation of a RDF URI.
+   Copyright (C) 2005  The University of Sheffield.
+
+This file is part of the CASheW-s editor.
+
+The CASheW-s editor is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+The CASheW-s editor is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with The CASheW-s editor; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+*/
+
+package nongnu.cashews.rdf;
+
+import java.net.URI;
+
+/**
+ * <p>
+ * This interface represents an RDF URI.
+ * </p>
+ *
+ * @author Andrew John Hughes (address@hidden)
+ * @see java.net.URI
+ */
+public class RDFURI
+  implements Subject, Predicate, RDFObject
+{
+
+  /**
+   * The URI itself.
+   *
+   * @see java.net.URI
+   * @serial the uniform resource identifier.
+   */
+  private URI uri;
+
+}