RE: [xml-dev] modelling the business rule "at least one of the elements"

["Paul Spencer" <xml-dev-list@boynings.co.uk>]

Have a look at the BS7666 address schema at
http://www.govtalk.gov.uk/schemasstandards/schemalibrary_schema.asp?schemaid
=244. At one point, this requires at least one of Town, Locality and
AdministrativeArea and none can be repeated. The trick is to keep your
schema deterministic.

Regards

Paul Spencer


> -----Original Message-----
> From: Joselito D. Moreno [mailto:joenmoreno@gmail.com]
> Sent: 20 November 2006 21:00
> To: xml-dev@lists.xml.org
> Subject: [xml-dev] modelling the business rule "at least one of the
> elements"
>
>
> Hi,
>
> I'm struggling with designing an XML Schema that has a conditional
> part to it.  Here's my issue:
>
> I would like to represent data, let's call it "parent" which can
> contain "at least" one of 3 elements ("child1",  "anotherchild", and
> "yetanotherchild")
>
> For example, this would be a valid "parent" element:
> <parent>
>     <child1>value of child 1</child1>
>     <anotherchild>value of anotherchild</anotherchild>
>     <yetanotherchild>value of yetanotherchild</yetanotherchild>
> </parent>
>
> This would be a valid "parent" element:
> <parent>
>     <anotherchild>value of anotherchild</anotherchild>
> </parent>
>
> This would be a valid "parent" element:
> <parent>
>     <child1>value of child 1</child1>
>     <yetanotherchild>value of yetanotherchild</yetanotherchild>
> </parent>
>
> This would be a INVALID "parent" element because there should be at
> least one of the child elements:
> <parent>
> </parent>
>
> This would be a INVALID "parent" element because the parent element
> can only contain at most 1 occurence of each kind of child element.
> <parent>
>     <child1>value of child 1</child1>
>     <yetanotherchild>value of yetanotherchild</yetanotherchild>
>     <yetanotherchild>value of yetanotherchild</yetanotherchild>
> </parent>
>
> Thanks in advance,
>
> Joen Moreno
>
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