[XQuery] MS-XQ-LC1-034

Sections 2.4.3 & 2.4.4.3 & 3.2.1.2 
Editorial	

"element(po:shipto, po:address) refers to an element that has the name
po:shipto (or is in the substitution group of that element), and has the
type annotation po:address (or a subtype of that type)": We assume that
this will be fixed to not include substitution groups.