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lucrecia chiartano

Subject: XMLSchema - optional attributeGroup definition
Author: lucrecia chiartano
Date: 20 Jan 2005 06:53 AM

Hello,

Can anyone help me to find a way to reference a group of attributes as optional?
Here I describe my problem,
thanks a lot,

Lucrecia Chiartano

-----------------------

I must define within a schema a rule that allows an xml leaf-node to carry with it two attributes.
Both of them may be present or not, but if only one exists it must be a precise one (attribute1 within next examples).

(Ex1 :--> allowed <node attribute1="attr1" attribute2="attr2">nodetext</node>)
(Ex2 :--> allowed <node>nodetext</node>)
(Ex3 :--> allowed <node attribute1="attr1">nodetext</node>)
(Ex4 :--> NOT allowed <node attribute2="attr2">nodetext</node>)

If 'attribute1' and 'attribute2' where just tags instead of attributes I could bound the rule defining an optional group with a required tag ('attribute1') and an optional one ('attribute2').
But they must be attributes, and I found that they can be grouped only using the xsd:attributeGroup tag that admits not a 'minOccurs' or a 'use' attribute (and then cannot be referenced as optional).

Here's the code I'm using

<xsd:element name="tagName">
<xsd:complexType>
<xsd:simpleContent>
<xsd:extension base="xsd:string">
<xsd:attributeGroup ref="attrGroupName"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
</xsd:element>

....

<xsd:attributeGroup name="attrGroupName">
<xsd:attribute name="attr1" type="xsd:string"/>
<xsd:attribute name="attr2" type="xsd:string" use="optional"/>
</xsd:attributeGroup>

....

Ivan Pedruzzi

Subject: XMLSchema - optional attributeGroup definition
Author: Ivan Pedruzzi
Date: 25 Jan 2005 12:49 AM

Lucrecia,

As far as i know XML Schema is not capable to express the attribute
presence conditionalized on another attribute.

You need to use a different schema language like Schematron to do it.

Ivan

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