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RE: Looking for advice on empty tag usage

From: Michael Kay <mhk@mhk.me.uk>
Date: Mon, 26 Jul 2004 17:47:58 +0100
To: "'Wilde Rebecca L SSgt HQ SSG/STS'" <Rebecca.Wilde@Gunter.AF.mil>, <xmlschema-dev@w3.org>
Message-Id: <20040726165930.80333A1D41@frink.w3.org>
I have in the past used an extra control attribute, such as
action="create|update|delete" to indicate what the recipient is expected to
do with the data. You could put this in a separate namespace to minimize the
impact on the schema describing the data itself.
Michael Kay


From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org] On
Behalf Of Wilde Rebecca L SSgt HQ SSG/STS
Sent: 26 July 2004 17:06
To: xmlschema-dev@w3.org
Subject: Looking for advice on empty tag usage


I'm working on creating an XML schema to be used with XSLT and Web Services
that interfaces with a legacy system.  On this legacy system there are
fields that accept values like "*" to signify that the user wants to clear
whatever was stored in that field before.   I would like to create something
more user friendly and intuitive (while still allowing a user to send an
asterisk to mean clear as well) and so some ideas I have come up with are:

1) Use an empty tag such as <ClearNarrative/> and then putting a group
choice of <ClearNarrative/> and <Narrative/> within my sequenced type.

2) Use an attribute to signify that the field should be cleared on the
legacy system.  Only problem is I don't see a way to use the attribute with
just listing the attribute without a value (i.e. <Narrative clear> instead
of <Narrative clear="Y">.

I cannot just assume that if <Narrative/> is sent to my Web Service that the
user wants the field cleared as some programs that interface may decide to
send all tags whether information is being passed or not.

I was wondering if there might be a best practice around on how best to
solve my problem.  Or if anyone might have some wisdom to share on this type
of situation.

Thank you in advance, 
Rebecca Wilde 
Received on Monday, 26 July 2004 12:59:32 UTC

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