Added prettyprinting of attributes

CompilerGeneration.jrag

@@ -135,6 +135,11 @@ aspect GenPrettyPrinter {
 		pStream.println("      getElement(i).prettyPrint(indent,pStream);");
 		pStream.println("    }");
 		pStream.println("  }\n");
+		pStream.println("  syn String Attribute.id() = \"\";");
+		pStream.println("  eq RdfId.id() = \"Rdf:ID\";");
+		pStream.println("  public void Attribute.prettyPrint(String indent, PrintStream pStream) {");
+		pStream.println("    System.out.print(\" \"+id()+\"=\"+getValue().getSTRING_LITERAL());");
+		pStream.println("  }\n");
 		super.genPrettyPrinter(pStream);
 		pStream.println("}\n");
 	}