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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Constraints for nested elements; key and keyref
ea_6666@f... writes:
> I have several elements named 'parent' with an attribute named
> 'parentid' and subelements 'child' also with an attribute
> 'childid'. My intention (first part) is that each child is unique
> with respect to the childid in his parent and each parent is unique
> with respect to his parentid in the root element. This can be done
> by the two keys 'childKey' and 'parentKey'. The second part of my
> intention is to reference in an later section of the xml-file to the
> childs, like it is show below. The problem is to describe an
> appropiate keyref.
Sensible design, sensible question, but can't be done with the XML as
described, sorry. Chained keyrefs, which is what you need, are a
candidate requirement for a subsequent version.
Meantime, only way to win is to copy parentid on to all children, then
use two-part key and keyref.
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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