href = null;
} else {
href = argument[0].evaluateItem(context).getStringValue();
}
CollectionURIResolver resolver = context.getConfiguration().getCollectionURIResolver();
SequenceIterator iter;
try {
iter = resolver.resolve(href, expressionBaseURI, context);
} catch (XPathException e) {
e.setLocator(this);
throw e;
}