[w3c sml] [4639] Reference cycles - document-based vs. element-based

Attached is a document that discusses element-based cycles vs.
document-based cycles. I thought it might be useful prior to further
discussion on this bug.

http://www.w3.org/Bugs/Public/show_bug.cgi?id=4639

--
ginny


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Virginia Smith 
HP Software / BTO R&D
916-785-9940
8000 Foothills Blvd | Roseville | CA 95747
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