Parameter entities in the internal subset using DOM.getInternalsubset are
either resolved or skipped
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Key: XERCESJ-1114
URL: http://issues.apache.org/jira/browse/XERCESJ-1114
Project: Xerces2-J
Type: Bug
Components: DOM (HTML)
Versions: 2.7.1
Environment: Windows XP JDK 1.4
Reporter: Laszlo Bartos
I have to print out the internal subset of XML documents, but the parameter
entity refs are always resolved by DOM parser. If I set the feature
http://xml.org/sax/features/external-parameter-entities to false, then it is
resolved to empty string (so the parameter entity ref disappears).
To reproduce the problem:
1. Save this as an XML document
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE PEtest PUBLIC "-//TEST//DTD PETest XML//EN" "petest.dtd" [ <!ENTITY %
local.ent PUBLIC "-//TEST//DTD PETest Extension XML//EN" ""> %local.ent; ]>
<PETest> <front> </front> <body> </body></PETest>
2. Set the feature http://xml.org/sax/features/external-parameter-entities to
false and call the DOM parser. Here is a sample program:
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[])
Result: The getInternalSubset will return
<!ENTITY % local.ent PUBLIC "-//TEST//DTD PETest Extension XML//EN" "">
which means that the entity ref is resolved to empty string. (If I set
http://xml.org/sax/features/external-parameter-entities to true, then the
parameter entity ref is correctly resolved and returned in getInternalSubset,
however I need the reference without resolving it.)
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.
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