At least one child

[pawel.pabich]

Hajo,

Example of XML:
<root>
<a/>
<b/>
<c/>
</root>

I need to ensure that one of a/b/c tags is present
and every of them can appear only once and they can
appear in any order.

any idea?

thanks in advance for info

Pawel

 

[pawel.pabich]

One more thing. _at_least_ one of a/b/c tags has to be present.

Pawel

 

[Harrie]

(e-mail address removed) said the following on 2005-10-04 12:56 +0200:

I need to ensure that one of a/b/c tags is present

Are you talking about a Schema (DTD, XSD) or something else?

and every of them can appear only once and they can
appear in any order.

If they may only apear once, how can they appear in any order?

 

[pawel.pabich]

Hajo,

Soory, I am talking about schema.

Every tag can appear once, it means that following are valid:

<root>
<a/>
<b/>
</root>

<root>
<c/>
<b/>
</root>

but at least one of them has to be present.


Pawel

 

[Henry S. Thompson]

<xs:all>
<xs:element name="a" minOccurs="0"/>
<xs:element name="b" minOccurs="0"/>
<xs:element name="c" minOccurs="0"/>
</xs:all>

will get you most, but not all, of what you want -- W3C XML Schema has
no way to express the "at least one of them must be present"
constraint.

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: (e-mail address removed)
URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]

 

[pawel.pabich]

Thanks

Pawel