Detect empty string error for prefixed namespace declarations, in the course of dropping XML 1.1 support; Detect bad prefix error for xmlns attributes
Dropped XML 1.1 support from conformance checker; Implemented namespace URL syntax check; Noted unimplemented serializability checks
Disallow non-defined xml:* attributes
Integrate attribute list checking code into one place; Use of unknown attributes is globally non-conforming
Fixed validation of special element and attribute names
Drop HTML-namespaced global attributes and repetition templates