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Posted to j-users@xerces.apache.org by Rob Davis-5 <te...@robertjdavis.co.uk> on 2008/03/12 14:13:40 UTC
Using LSParser with Local DTD gives exception: Recursive entity
reference "%svg-framework.mod"
I am gettting the following exception attempting to parse an SVG XML document
and use a local copy of the SVG DTD.
org.w3c.dom.ls.LSException: Recursive entity reference "%svg-framework.mod".
(Reference path: %svg-framework.mod -> %svg-framework.mod ->
%svg-framework.mod),
[Fatal Error] svg11.dtd:73:20: Recursive entity reference
"%svg-framework.mod". (Reference path: %svg-framework.mod ->
%svg-framework.mod -> %svg-framework.mod),
exception
Recursive entity reference "%svg-framework.mod". (Reference path:
%svg-framework.mod -> %svg-framework.mod -> %svg-framework.mod),
Why has it got a problem with this - this is identical to what is on the w3c
site so it should be bugfree.
Why does it think there is recursion and why is that a problem?
Should I be setting a value on the DOMImplementation?
I have downloaded the entire SVG DTD and associated files.
Here is my code:
LocalDTDResolver localDTDResolver
= new LocalDTDResolver( new File("C:/svgdtd/svg11.dtd") );
File file = new File("C:\\file.svg");
URI localFileAsUri = file.toURI();
DOMImplementationRegistry registry =
DOMImplementationRegistry.newInstance( );
DOMImplementationLS lsImpl =
(DOMImplementationLS)registry.getDOMImplementation("LS");
LSParser parser =
lsImpl.createLSParser(DOMImplementationLS.MODE_SYNCHRONOUS,
null);
// Set options on the parser
DOMConfiguration config = parser.getDomConfig( );
config.setParameter("validate", Boolean.TRUE);
config.setParameter("resource-resolver", localDTDResolver );
org.w3c.dom.Document doc = parser.parseURI(localFileAsUri.toString());
--
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Re: BETTER SOLUTION - Re: Using LSParser with Local DTD gives exception: Recursive
entity reference "%svg-framework.mod"
Posted by Michael Glavassevich <mr...@ca.ibm.com>.
It's a different solution. Wouldn't necessarily say it's better since it
doesn't work in general [1].
Thanks.
[1] http://doctypechanger.sourceforge.net/#doc.Charset
Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org
Rob Davis-5 <te...@robertjdavis.co.uk> wrote on 04/14/2008 01:06:45 PM:
>
> Actually,
> I've found this to not work - I still get major problems. However I have
> found an alternative with
> http://doctypechanger.sourceforge.net/
>
> which works just great!!!
>
> --
> View this message in context: http://www.nabble.com/Using-LSParser-
> with-Local-DTD-gives-exception%3A-Recursive-entity-reference-%22-
> svg-framework.mod%22-tp16002292p16679031.html
> Sent from the Xerces - J - Users mailing list archive at Nabble.com.
>
>
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BETTER SOLUTION - Re: Using LSParser with Local DTD gives
exception: Recursive entity reference "%svg-framework.mod"
Posted by Rob Davis-5 <te...@robertjdavis.co.uk>.
Actually,
I've found this to not work - I still get major problems. However I have
found an alternative with
http://doctypechanger.sourceforge.net/
which works just great!!!
--
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SOLVED - Re: Using LSParser with Local DTD gives exception:
Recursive entity reference "%svg-framework.mod"
Posted by Rob Davis-5 <te...@robertjdavis.co.uk>.
SOLVED!
The problem was with the LocalDTDResolver I needed to implement.
(I need this because I do not want the software to connect to the internet
to fetch the DTD. I want to have the DTD local because I want a standalone
solution. Local validation is required because an internet connection will
not be available in my setup.)
The LocaDTDResolver was not correctly returning the correct document when
asked for by the parser. Specifically it was always returning the DTD when
actually another document module referenced by the DTD was asked for. This
resulted in duplicate declaration which caused the recursion issue. the DTD
is a document in itself that then references other files (called modules)
I solved this problem partly by first doing a google search for "Recursive
entity reference" and looking for the authoritative official Java forums and
found:
http://forum.java.sun.com/thread.jspa?threadID=5264261&tstart=90
This was not quite what I needed because it was talking about SAX. HOWEVER
the problem was the same. All I needed to do was apply it for DOM.
The key was getting the LocalDTDResolver figure out what the Parser wanted
from what it was asking for. Here's the code for the resolver and following
that the code that uses it to parse.
import java.io.File;
import java.net.MalformedURLException;
import java.net.URI;
import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSResourceResolver;
public class LocalDTDResolver implements LSResourceResolver {
String myLocalDTDFileAsString;
URI localDTDFileAsUri;
String myLocalDTDPath;
LSInput LSInput;
public LocalDTDResolver( String localDTDPath, String localSVGDTDFilename
) throws MalformedURLException
{
myLocalDTDPath = localDTDPath;
myLocalDTDFileAsString = localDTDPath + localSVGDTDFilename;
LSInput = new LSInput(myLocalDTDFileAsString );
}
public LSInput resolveResource(String type, String namespaceURI, String
publicId, String systemId, String baseURI)
{
//Allow the application to resolve external resources.
// the occasion where systemId == null
// is where the LSParser has finished looking at the
// DTD and is now looking at the XML document itself
// so at this point, make the systemid the same as the
// baseuri - the XML document location
if ( systemId == null )
{
System.out.println( "systemId:" + systemId );
LSInput.setSystemId( baseURI );
LSInput.setPublicId( null );
LSInput.setBaseURI( baseURI );
return LSInput;
}
if (systemId.endsWith("mydtd.dtd"))
{
return LSInput;
}
else
{
System.out.println( "myLocalDTDPath + systemId:" + myLocalDTDPath +
systemId );
LSInput.setSystemId( myLocalDTDPath + systemId );
return LSInput;
}
}
}
/*
System.out.println( "\nDEBUG" );
System.out.println( "type: " + type );
System.out.println( "namespaceURI:" + namespaceURI );
System.out.println( "publicId:" + publicId );
System.out.println( "systemId:" + systemId );
System.out.println( "baseURI:" + baseURI );
System.out.println( "\n" );
import java.io.File;
import java.io.InputStream;
import java.io.Reader;
import java.net.URI;
import org.w3c.dom.ls.LSInput;
public class LSInput implements LSInput {
private String myLocalDtdFileAsString;
public LSInput( String localDtdFileAsString )
{
setSystemId( localDtdFileAsString );
}
@Override
public String getBaseURI() {
// TODO Auto-generated method stub
return null;
}
@Override
public InputStream getByteStream() {
// TODO Auto-generated method stub
return null;
}
@Override
public boolean getCertifiedText() {
// TODO Auto-generated method stub
return false;
}
@Override
public Reader getCharacterStream() {
// TODO Auto-generated method stub
return null;
}
@Override
public String getEncoding() {
// TODO Auto-generated method stub
return null;
}
@Override
public String getPublicId() {
// TODO Auto-generated method stub
return null; //"-//W3C//DTD SVG 1.1//EN";
}
@Override
public String getStringData() {
// TODO Auto-generated method stub
return null;
}
@Override
public String getSystemId() {
// TODO Auto-generated method stub
URI localDtdFileAsUri = (new File( myLocalDtdFileAsString )).toURI();
return localDtdFileAsUri.toString();
}
@Override
public void setBaseURI(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void setByteStream(InputStream arg0) {
// TODO Auto-generated method stub
}
@Override
public void setCertifiedText(boolean arg0) {
// TODO Auto-generated method stub
}
@Override
public void setCharacterStream(Reader arg0) {
// TODO Auto-generated method stub
}
@Override
public void setEncoding(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void setPublicId(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void setStringData(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void setSystemId( String localDtdFileAsString )
{
myLocalDtdFileAsString = localDtdFileAsString;
}
}
// part based on Oreilly Java and XML book
File file = new File("C:\\myfile.svg");
URI localFileAsUri = file.toURI();
DOMImplementationRegistry registry =
DOMImplementationRegistry.newInstance( );
DOMImplementationLS lsImpl =
(DOMImplementationLS)registry.getDOMImplementation("LS");
LSParser parser =
lsImpl.createLSParser(DOMImplementationLS.MODE_SYNCHRONOUS,
null);
// Set options on the parser
DOMConfiguration config = parser.getDomConfig( );
config.setParameter("validate", Boolean.TRUE);
config.setParameter("resource-resolver", LocalDTDResolver );
org.w3c.dom.Document doc = parser.parseURI(localFileAsUri.toString());
--
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