If the application decides to terminate parsing before the xml document
is fully parsed, the application should call this method to free any
resource allocated during parsing.
If and only if that type definition is a simple type definition
with {variety} union, or a complex type definition whose {content type}
is a simple thype definition with {variety} union, then an item isomorphic
to that member of the union's {member type definitions} which actually
validated the element item's normalized value.
Validity value indicating that validation has been strictly
assessed and the element in question is invalid according to the
rules of schema validation.
Constructs an input source from just the public and system
identifiers, leaving resolution of the entity and opening of
the input stream up to the caller.
XML Information Set REC
all namespace attributes (including those named xmlns,
whose [prefix] property has no value) have a namespace URI of http://www.w3.org/2000/xmlns/