Verify another kind of XML structure. #3482.

A situation analogous to this is present in the XML file causing #3482.
It turns out that VdrXml::Reader already handles this case.
Ignore leading zeros on xs:ints. Closes #3491.

This ensures that a value like "037" being set on a model attribute
which is declared in the VDR schema as xs:int will be stored as the
integer 37.