Problem with grammar pool

[Bob Foster]

My XMLGrammarPool implementation keeps a cache of grammars, invalidating 
the cache when a grammar is modified. This works quite well when a 
document directly references a schemaLocation of, say, A.xsd. If A.xsd 
is modified and the document revalidated, the pool correctly does not 
return the cached grammar, allowing Xerces to recalculate it.

The problem arises when A.xsd includes or imports B.xsd and B.xsd is 
changed. Even though the cached grammar for B.xsd is refreshed, when the 
document is revalidated the consolidated schema representing A.xsd, 
which incorporates information from the previous version of B.xsd, still 
appears to be up-to-date and is incorrectly used for validation.

The solution would seem to be that when a schema for a given namespace 
is replaced in the cache, cache entries for all schemas depending on 
that schema should also be invalidated. Unfortunately, Xerces doesn't 
seem to provide any way to get such dependency information. AFAIK, the 
grammar pool can't tell the difference between two schemas that are used 
sequentially (independent) and one schema included by another (dependent).

Any suggestions welcome.
Bob Foster
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