I've implemented a URIResolver that returns subtrees of existing documents.  I've noticed that Saxon is passing the entire document instead of my subtrees.  Here's the source code:
import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.URIResolver;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
public final class URIResolverProblem {
    private static String XSLT =
            "<xsl:stylesheet version=\"2.0\" xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">\n" +
            "    <xsl:output indent=\"yes\" />\n" +
            "    <xsl:strip-space elements=\"*\"/>\n" +
            "\n" +
            "    <xsl:template match=\"/\">\n" +
            "        <xsl:copy-of select=\"document('any.uri')\"/>\n" +
            "    </xsl:template>\n" +
    private static final String XML = "<root><leaf/></root>";
    public static void main(String[] args) throws TransformerException, ParserConfigurationException {
        TransformerFactory tfactory = TransformerFactory.newInstance();
        DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        tfactory.setURIResolver(new SampleResolver());
        Templates stylesheet = tfactory.newTemplates(new StreamSource(new StringReader(XSLT)));
        Transformer transformer = stylesheet.newTransformer();
        DOMSource emptySource = new DOMSource(documentBuilder.newDocument());
        transformer.transform(emptySource, new StreamResult(System.out));
    private static class SampleResolver implements URIResolver {
        private final DocumentBuilder documentBuilder;
        public SampleResolver() throws ParserConfigurationException {
            this.documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        public Source resolve(String href, String base) throws TransformerException {
            // for simplicity, ignoring href
            try {
                Document document = documentBuilder.parse(new InputSource(new StringReader(XML)));
                NodeList childNodes = document.getDocumentElement().getChildNodes();
                for (int i = childNodes.getLength() - 1; i >= 0; i--) {
                    Node childNode = childNodes.item(i);
                    if (childNode.getNodeType() == Node.ELEMENT_NODE) {
                        System.out.println("\nreturning the following node: " + childNode.getNodeName() + "\n");
                        return new DOMSource(childNode);
            } catch (Exception e) {
                throw new TransformerException(e);
            throw new TransformerException("could not find element");
here's the output:
returning the following node: leaf
<?xml version="1.0" encoding="UTF-8"?>
So, I'm returning a DOMSource consisting of the 'leaf' node, but saxon returns the 'root' node.
Any ideas?

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