||Interface that is used to allow validators to do attribute defaulting.
||Specialized interface that covers schema features unique to DTDs.
||Interface that defines API that Stax2 validation system exposes to the
||Interface that defines functionality exposed by the "owner" of the
content to validate (usually a stream reader or stream writer) to
validators, needed in addition to actually validatable content, for
||This interface defines method(s) needed to implement a custom validation
problem (warning, error, fatal error) handler.
||Defines the API that validator schema instances have to implement.