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- From: "Michael Kay" <M.H.Kay@eng.icl.co.uk>
- To: <email@example.com>
- Date: Wed, 2 Dec 1998 10:18:37 -0000
>How can you represent a strictly acyclic graph using ID/IDREF?
You make the IDREF attribute optional, and use the absence of a value (the
#IMPLIED default) to indicate a node that has no "parent".
There are many other solutions, e.g. you could have a dummy element with the
special ID value of "NULL", but I can't see why one would want to.
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