Access to unparsed entities

Is there a consensus regarding how best to handle references to unparsed
external entities (e.g. graphics) in an XML document during transformation? 

It would be nice to have such entities stored in a table when the document
is first read in, such that an XSL transformation can read from and write
to the table, and such that the table is again written out in the
document's internal DTD subset after transformation is complete.

// Gregory Murphy <Gregory.Murphy@xxxxxxx>
// Software Engineer
// Customer Network Platform, Sun Microsystems


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