> 10. An XML processor (necessarily a non-validating one) that does
 > not include the replacement text of an external parsed entity
 > in place of an entity reference must notify the application that
 > it recognized but did not read the entity (4.4.3)  [SAX does not
 > provide for this]
SAX offloads this responsibility to the application using the
EntityResolver interface.
All the best,
David
-- David Megginson david@megginson.com http://www.megginson.com/