Internal subset equivalent in new schema proposals?
M.H.Kay at eng.icl.co.uk
Wed Dec 2 10:23:27 GMT 1998
>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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