Parameter entity refs in the internal subset using DOM

[László Bartos]

I have a problem using xerces-2_7_1: If have to print out the internal subset of XML documents, but the parameter entity refs are lost by DOM parser:

Here is the code:

 

    public static void main(String argv[]) {

        ParserWrapper parser = null;
        // create parser
        try {
            parser = (ParserWrapper)Class.forName("dom.wrappers.Xerces").newInstance();
            parser.setFeature("http://xml.org/sax/features/namespaces", false);
            parser.setFeature("http://xml.org/sax/features/validation", false);
            parser.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
            parser.setFeature("http://apache.org/xml/features/validation/schema", false);
            parser.setFeature("http://apache.org/xml/features/validation/dynamic", false);
            parser.setFeature("http://apache.org/xml/features/xinclude", false);
            parser.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
            // parse file
            Document document = parser.parse(argv[0]);
            System.out.println(document.getDoctype().getInternalSubset());
        }
        catch (Exception e) {
          e.printStackTrace(System.err);
        }
    } // main(String[])

If I set the feature "http://xml.org/sax/features/external-parameter-entities" to true, then the parameter entity is resolved by DOM. However I need the reference without resolving it. Is this a bug or a feature? Is there a better approach/workaround for that?

 

After some debugging I have found that if I add the following code into org.apache.xerces.parsers.AbstractDOMParser.startParameterEntity(String, XMLResourceIdentifier, String, Augmentations): 

 

   ...

   //append the paremeter entity reference if it was not resolved
        if (fInDTD && fInternalSubset != null && !fInDTDExternalSubset && augs != null) {
          Object skip = augs.getItem(Constants.ENTITY_SKIPPED);
          if (skip instanceof Boolean && (Boolean)skip == Boolean.TRUE) {
            fInternalSubset.append(name);
            fInternalSubset.append(";\n");
          }
        }

 

then the parameter entity ref is included in the internal subset. 

 

Can somebody confirm whether this is the only solution or there exist some better?

 

Thanks!

 

Laszlo Bartos