Given an select expression and a context, evaluate the XPath and return the resulting iterator.
@param xctxt The execution context.
@param contextNode The node that "." expresses.
@return A valid DTMIterator.
@throws TransformerException thrown if the active ProblemListener decidesthe error condition is severe enough to halt processing.
@throws javax.xml.transform.TransformerException
@xsl.usage experimental
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