Use XML Catalogs in saxonb-xslt

It would be nice if the script provided in /usr/bin/saxonb-xslt would use /etc/xml/catalog and org.apache.xml.resolver so that it wouldn't hit the network each time it tries to transform XML documents with a doctype (e.g. XHTML documents).

The following script would do:
#!/bin/sh
if [-f /usr/share/java/xml-commons-resolver-1.1.jar and -f /etc/xml/catalog ]
then exec java -cp /usr/share/java/xml-commons-resolver-1.1.jar:/usr/share/java/saxonb.jar -Dxml.catalog.files=/etc/xml/catalog -Dxml.catalog.verbosity=1 net.sf.saxon.Transform -novw -r org.apache.xml.resolver.tools.CatalogResolver -x org.apache.xml.resolver.tools.ResolvingXMLReader -y org.apache.xml.resolver.tools.ResolvingXMLReader "$@"
else
exec java -classpath /usr/share/java/saxonb.jar net.sf.saxon.Transform "$@"
fi

It would probably be worth adding libxml-commons-resolver1.1-java as a suggested package in that case.