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Re: NamedNodeMap

From: Fred L. Drake, Jr. <fdrake@acm.org>
Date: Wed, 11 Jul 2001 14:56:45 -0400 (EDT)
Message-ID: <15180.41325.43186.533492@cj42289-a.reston1.va.home.com>
To: "Allen, Michael B (RSCH)" <Michael_B_Allen@ml.com>
Cc: "'www-dom@w3c.org'" <www-dom@w3c.org>

Allen, Michael B (RSCH) writes:
 > Is a NodeNamedMap ever used to hold anything but the Attrs of an
 > Element?

  Yes -- they are used to hold the entity and notation definitions in
the DocumentType node.

 >          Might an Attr be an entry in more than one
 > NamedNodeMap?  A simply way to implement NamedNodeMap in
 > c is to just add nextAttr and previousAtt members to Node and
 > make NamedNodeMap a struct like:
 > If the answers to the above questions are "no" I don't see a problem
 > with this technique. Do you?

  I don't think Attr nodes can appear in more than one map.
Whether or not this is a reasonable implementation approach depends
on how you handle default attributes derived from the DTD; if you
support a DTD, this may not be a good approach, especially if you
support DOM mutation.
  (And yes, I think mutation should be a separate feature from simple
read-access!  But that's a different topic.)


Fred L. Drake, Jr.  <fdrake at acm.org>
PythonLabs at Digital Creations
Received on Wednesday, 11 July 2001 14:58:49 UTC

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