slightly OT: using Localize taskdef from within Eclipse

Hi,

the Eclipse IDE (http://www.eclipse.org) is capable of calling targets
in existing ant build files. When calling the Localize taskdef, I get
this error:

    [localize] ...Invoking XMLC precompiler taskdef
     [xmlc] Invoke XMLC on
/home/stefan/workspace/Overread/src/com/abc/overread/xmlc/template.html
    [localize] ...Invoking Javac compiler taskdef
    [localize] Compiling 25 source files to
/home/stefan/workspace/Overread/build/WEB-INF/classes
    [localize]
/home/stefan/workspace/Overread/src_generated/src_xmlc/com/abc/overread/xmlc/templateHTML.java:106: cannot access org.w3c.dom.ranges.DocumentRange
    [localize] file org/w3c/dom/ranges/DocumentRange.class not found
    [localize]         setDocument(fLazyDocument, "text/html",
"ISO-8859-1");
    [localize]         ^
    [localize] 1 error
    [localize] BUILD FAILED:
file:/home/stefan/workspace/Overread/build.xml:389: Compile failed; see
the compiler error output for details.
Total time: 6 seconds

The reason for this is IMHO the Xerces1-dependency of XMLC (the
superclass of Localize). 

When calling the Localize taskdef from the same build.xml via command
line (aka outside Eclipse) everything works fine.

Any ideas?

Kind regards,
Stefan