L3 XPath contains two evaluate functions, one on XPathEvaluator and one on 
XPathExpression.  dom-to-dtd and dom-to-schema will generate the element 
definition based on the first method signature encountered which results in 
attributes resolver and expression being required which do not appear in the 
signature of XPathExpression.

The resolution is to place a preconstructed evaluate element in the transforms 
and remove the extra attributes that were placed in the tests just to satisify 
validation.