[xml] Environment Variables in XML are parsed by libxml2 ?

["Arijit Das" <arijit79 gmail com>]

Is there any way I can change the following DTD spec inside my XML
document from this:

<!DOCTYPE ENVCAP SYSTEM "/remote/vgsource1/arijit/Tc.Perforce/lib/envcap.dtd">


...to this =>
<!DOCTYPE ENVCAP SYSTEM "$(TCHOME)/lib/envcap.dtd">

Finally, I need to have libxml2 parse my document.

Arijit