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Lisa FeltenSubject: Check for valid attribute values based on other attribute values at runtime?
Author: Lisa Felten
Date: 02 Oct 2009 08:20 PM
I know this is likely possible, but I'm having trouble locating a how-to guide that explains exactly what I want to do...

I have a recursively-defined complexType referenced by the root of my schema:

<xs:element name="root" type="RootNode"/>

<xs:complexType name="RootNode">
<xs:element name="sub" type="SubNode"/>
<xs:attribute name="version" type="xs:string"/>
<xs:attribute name="name" type="xs:string" use="required"/>
</xs:complexType>

<xs:complexType name="SubNode">
<xs:choice>
<xs:element name="sub" type="SubNode" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="other" type="OtherNode"/>
</xs:choice>
<xs:attribute name="type" type="SubType" use="required"/>
<xs:attribute name="id" type="xs:string" use="required"/>
</xs:complexType>


Now, I have a list of defined SubType enums but even more specifically, I want to be able to have rules regarding the "type" attribute of the SubNode. Say I have type0, type1, type2 and type3 being the valid enums. But since a SubNode can have one or more SubNode child nodes, I want to specify that a type0 SubNode should have exactly one type1 SubNode child. And that a type1 SubNode should have exactly two type2 SubNode children. And a type2 SubNode should have exactly three type3 SubNode children.

I think I have to use something outside the XML Schema spec...but what? How do I enforce these rules? Schematron? I've never used it...just heard the name.
Postnext
Ivan PedruzziSubject: Check for valid attribute values based on other attribute values at runtime?
Author: Ivan Pedruzzi
Date: 06 Oct 2009 06:07 PM

Hi Lisa,

May be using XQuery for content base validation is an option.

Ivan Pedruzzi
Stylus Studio Team
Posttop
Lisa FeltenSubject: Check for valid attribute values based on other attribute values at runtime?
Author: Lisa Felten
Date: 06 Oct 2009 07:47 PM
Thanks, Ivan.

I've since solved my problem by using an XSLT stylesheet instead of trying to use XML Schemas to validate my instance file. XSLT allows for XPath expressions, along with if/choose/when/otherwise tags which facilitate what I needed to do.
   
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