Overriding XSD locations when validating an xml document with multiple xsd references

[anthony]

Hello,
I need to validate incoming xml documents against multiple xml schemas
These xsd's are all named in the incoming xml documents but their
location as specified in the incoming xml documents is not guaranteed
to be accessible within our enterprise. I need to be able to override
these locations in java code with internally available versions. I am
aware of the http://java.sun.com/xml/jaxp/properties/schemaSource
feature which can be used to override a single schema location but this
does not work for multiple schemas. Does anyone know how I can achieve
this???