XSD 1.0 3.3.2: an element with neither a `type` attribute nor an inline type, but
a `substitutionGroup`, takes the {type definition} of its head. PureXML defaulted
such an element to `anyType`, so an instance of it accepted any content.
`XSDParser.elementType` now resolves the head declaration through
`context.globalElements` (transitively, with a cycle guard) and uses its type.
XSTS invalid-instances-accepted 29 -> 28 (typeDef00204m: <root>Yes</root> is no
longer accepted where root substitutes a boolean head), no other bucket moved
(valid-schemas-rejected and valid-instances-rejected held at 0 across all 14383
groups). 1451 unit tests pass.
Mihaela Mihaljevic
45f2e7dbf5