On the cross-document skip path (a schema declares import/include/redefine
but no external document was loaded), the reference check stood down whole,
so a prefixed reference whose namespace is never imported was accepted even
though it can resolve to no component under any loading (corpus schZ011's
d:d, where namespaces a/b/c are imported but d is not).
Add undeclaredNamespaceReferenceErrors, run only on that skip path, to flag
a reference whose namespace is neither the target, the XSD or XML namespace,
nor named by any xs:import. To stay sound when the import closure is unknown,
it stands down entirely the moment any external carries a schemaLocation:
that document may transitively import the referenced namespace (corpus
schZ004 imports only a, yet a's document imports b, so b:b resolves). It
applies only when every external is location-less and the closure is
provably complete.
XSTS invalid-schemas-accepted 43 -> 39 (schZ011_a-d); valid-schemas-rejected
held at 0; no other bucket moved.
Mihaela Mihaljevic
7256df1ceb