With an URIResolver is that you can create a catalog or map configuration that matchs an ID with the actual URI. So you use the id xml:hoo in you document("xml:hoo") and you set the URIResolver to return the resource id'd in the catalog. You can also ensure that non-inhouse developed XSL are coming from a place that you specify.

<catalog> <file id="xml:hoo" uri="http://hoo.com/boo/hoo.xml"/> </catalog>

you set the URIResolver like:

TransformerFactory factory = TransformerFactory.newInstance(); factory.setURIResolver(new MyURIResolver(args));

here is a simple URIResolver:

import java.io.*; import java.util.*; import javax.xml.transform.*; import javax.xml.transform.stream.*; class MyURIResolver implements URIResolver { private MyObj obj; public MyURIResolver(MyObj obj) { this.obj = obj; } public Source resolve(String href,String base) { System.out.println("href: " + href); System.out.println("base: " + base); if (href.equals("xml:hoo")) { return new StreamSource((File)this.obj.getResolvedFile(href)); } return null; } }

(Thanks to Robert Koberg)