[DFDL-WG] Issue 163: Expressions returning ES - type of error when expression returns wrong type.

I reviewed section 23. The last paragraph of 23.3 is inconsistent with the rest of the section. Suggested revised wording: The result of evaluating the expression must be a single atomic value of the type expected by the context, and it is a schema definition error otherwise. Some XPath expressions naturally return a sequence of values, and in this case it is also schema definition error if an expression returns a sequence containing more than one item. If the expression returns an empty sequence it will be treated as returning *nil*. -- Mike Beckerle | OGF DFDL WG Co-Chair Tel: 781-330-0412