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Re: does schema support relational and logical opertors ??

From: Michael Anderson <michael@research.canon.com.au>
Date: Wed, 07 Feb 2001 08:42:40 +1100
Message-ID: <3A806FD0.F54C56F@research.canon.com.au>
To: anand awasthi <anand-awasthi@usa.net>
Cc: zvon@list.zvon.org, xerces-j-dev@xml.apache.org, xmlschema-dev@w3.org
Hi anand,

In short - No.  W3C XML Schema does not support relational and logical operators.

anand awasthi wrote:

> Hi,
> my question is that if define my schema like following :
> <attributeGroup name="trigger-attribute-group">
> <attribute name="XYZ()" value=" ((X < 20) && (Y > 400)) || (Z == 45) "/>
> <attribute name="ABC()" value="MAX(J:TT)  ==  20"/>
> </attributeGroup>
> i want functions XYZ()/ABC() to be trigeered if the condtion in value attrbute
> is true....

There have been previous posts [on the xmlschema-dev list that is.  Try to avoid
cross-posting ] suggesting the similar ideas, like can the appearance of an
element be dependent upon the appearance / value of an attribute.  The answer is
no, but I think ht may have mentioned it is likely to be a feature of an extension
to schema.  But my memory isn't that good so I'll leave it up to you to search the
old messages to confirm.

> can i parse my schmea for relational and logical operators/...does schema
> provides these
> operator supports ..

This has been asked a few times, maybe it could make an appearance in the FAQ

> or you couls pls suugest some better option....but

> definitely i dont want to
> do this in my java program...

I think you'll have to..... but I have a feeling that Schematron may do it for
you, but I'm not even a novice in Schematron so you should look for yourself

Received on Tuesday, 6 February 2001 16:42:58 UTC

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