Saxon

Greetings,

I could use some help with a behavior I'm not understanding with an ExternalFunction which returns a list of nodes.

I've boiled it down to this example.

My Java code looks like this:

public class Test 
{
	private static ExtensionFunction example = new ExtensionFunction() {
		
		public QName getName() {
			return new QName("http://seastreet.com", "test");
		}

		public SequenceType getResultType() {
			return SequenceType.makeSequenceType(ItemType.ELEMENT_NODE, OccurrenceIndicator.ZERO_OR_MORE);
		}

		public SequenceType[] getArgumentTypes() {
			return new SequenceType[] {
			};
		}

		public XdmValue call(XdmValue[] arguments) throws SaxonApiException {
			StringBuffer strXml = new StringBuffer();
			strXml.append("<root>");
			strXml.append("<a>");
			strXml.append("<x>x value 1</x>");
			strXml.append("<y>y value 1</y>");
			strXml.append("<z>z value 1</z>");
			strXml.append("</a>");
			strXml.append("<a>");
			strXml.append("<x>x value 2</x>");
			strXml.append("<y>y value 2</y>");
			strXml.append("<z>z value 2</z>");
			strXml.append("</a>");
			strXml.append("</root>");

		    Processor proc = new Processor(false);
		    DocumentBuilder builder = proc.newDocumentBuilder();

		    // Load the XML document.
		    StringReader reader = new StringReader(strXml.toString());
		    XdmNode doc;
			try {
				doc = builder.build(new StreamSource(reader));
				XdmNode root = doc.children("root").iterator().next();
				Iterable<XdmNode> i = root.children();
				return new XdmValue(i);
			} catch (SaxonApiException e) {
				System.err.println("Error processing document: " + e.getMessage());
				System.err.println(strXml);
				return XdmEmptySequence.getInstance();
			}
		}
	};
	
    public static void main( String[] args ) throws SaxonApiException
    {
		Processor processor = new Processor(false);
		processor.registerExtensionFunction(example);
		XsltCompiler compiler = processor.newXsltCompiler();
		XsltExecutable stylesheet = compiler.compile(new StreamSource(new File("resources/test.xsl")));
		Serializer out = processor.newSerializer(System.out);
		out.setOutputProperty(Serializer.Property.METHOD, "xml");
		out.setOutputProperty(Serializer.Property.INDENT, "yes");
		Xslt30Transformer trans = stylesheet.load30();
		trans.transform(new StreamSource(new StringReader("<root/>")), out);
    }
}

My XSL looks like this:

<xsl:stylesheet version="1.0" 
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:sst="http://seastreet.com">
	<xsl:template match="/">
OUTPUT:
<xsl:for-each select="sst:test()">
<xsl:text>&#10;</xsl:text>
**************************
copy-of for item
<xsl:copy-of select="current()"/>
**************************
name(for item): <xsl:value-of select="name(.)"/>
**************************
for-each child:
<xsl:for-each select="./*">
<xsl:value-of select="name(.)" />: <xsl:value-of select="."/><xsl:text>&#10;</xsl:text>
</xsl:for-each>
**************************
./x: <xsl:value-of select="./x"/>
./y: <xsl:value-of select="./y"/>
./z: <xsl:value-of select="./z"/>
</xsl:for-each>
**************************
</xsl:template>
</xsl:stylesheet>
</pre>

And my output looks like this:

OUTPUT:


**************************
copy-of for item
<a>
   <x>x value 1</x>
   <y>y value 1</y>
   <z>z value 1</z>
</a>
**************************
name(for item): a
**************************
for-each child:
x: x value 1
y: y value 1
z: z value 1

**************************
./x: 
./y: 
./z: x value 1

**************************
copy-of for item
<a>
   <x>x value 2</x>
   <y>y value 2</y>
   <z>z value 2</z>
</a>
**************************
name(for item): a
**************************
for-each child:
x: x value 2
y: y value 2
z: z value 2

**************************
./x: 
./y: 
./z: x value 2
**************************

The problem is accessing the elements of the XML using xpath. Note that when I iterate over all children of the node, I see each child element and its value as I expect. When I try to obtain the value directly with xpath expressions selecting the child nodes I do not get the values I expect. Note that ./x and ./y both appear empty and ./z appears to have the value I would expect for ./x

I must be doing something basically wrong, but I can't figure out what it is.

Thanks for any help you can offer.