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This is my XPath operation:

XPathExpression source = xpath.compile("@source/text()");

I'm looping over a node list created by another XPath operation on the main document. So I'm calling source like this:

(NodeList)source.evaluate(list.item(x), XPathConstants.NODESET);

The resulting node list is always empty. Why is that?

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@source/text() is not valid: @source is an attribute, and attributes do not have child nodes - text or otherwise.

You should use simply @source.

(Seeing the XML would help, but I am assuming that list.item(x) is an XML element that can have a source attribute)

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