• To: Paul Popiel <PaulP@a...>
• Subject: Re: Key constraint on optional attribute
• From: ht@i... (Henry S. Thompson)
• Date: Wed, 16 Nov 2005 15:10:37 +0000
• Cc: xml-dev@l...
• In-reply-to: <B9F4AED7AF54D511BDA600306E07B460017806D3@EXCHANGEPER> (PaulPopiel's message of "Wed, 16 Nov 2005 10:19:39 +0800")
• References: <B9F4AED7AF54D511BDA600306E07B460017806D3@EXCHANGEPER>
• User-agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.17 (Jumbo Shrimp, linux)

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Paul Popiel writes:

> is there anyway of placing a key constraint on an optional attribute?

That's what 'unique' constraints are for -- not required to be
present, but required to be unique _when_ present.

If that's not what you meant, more details of your document type and
requirements are needed. . .

ht
- -- 
 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: ht@i...
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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    • From: Paul Popiel <PaulP@a...>

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