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Subject: Re: Worry about using lexical order for preferences.


That's a pretty important point about DOM.  We should fix our definition.
One possibility is an attribute whose values are 1, 2, 3,...  Can anyone
think of something better?



Martin W. Sachs
IBM T. J. Watson Research Center
P. O. B. 704
Yorktown Hts, NY 10598
914-784-7287;  IBM tie line 863-7287
Notes address:  Martin W Sachs/Watson/IBM
Internet address:  mwsachs @ us.ibm.com

"Moberg, Dale" <Dale_Moberg@stercomm.com> on 01/30/2001 09:30:16 AM

To:   ebxml-tp@lists.ebxml.org
Subject:  Worry about using lexical order for preferences.


One idea under consideration in TPA WG is
to use the CPP lexical order for preferences
among those elements having duplicated
capabilities (such as several possible
delivery channels and so on).

I noticed yesterday that a popular
implementation of DOM API in Java (Xerces)
has a number of methods returning
multiple elements that do not preserve
lexical order. For example, the "getAttributes"
method returns a NamedNodeMap
in which the nodes are alphabetically
ordered, so that index 0, for example,
returns the alphabetically first
attribute by name of attribute and not the
lexically first attribute (I guess
I'd better mention that lexical order here
just means the order in which
it occurs in the file/stream).

So while I have not checked out every
method (and I think this will be a DOM
problem, because SAX callbacks do
follow lexical order as far as I can tell),
I am wondering whether we should
be more explicit about preference. Sorry
to add another item.

(I should also mention that
DOM implementations will probably
be popular for dealing with CPP
processing because of the need to jump around
with IDs while figuring out whether
and how the capabilities match.)

Dale Moberg

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