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   RE: [xml-dev] Schema validation question

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Linda, just RELAX, and get some sleep.

start = Fruits
Fruits = element Fruits { Fruit+ }
Fruit  = element Fruit  { Apple | Orange  }
Apple  = element Name { 'Apple' }, element Abbrev { 'APL' }
Orange = element Name { 'Orange' }, element Abbrev { 'ORG' }

     <!-- invalid:

-----Original Message-----
From: Linda Grimaldi [mailto:grimlinda@earthlink.net] 
Sent: Tuesday, May 04, 2004 5:18 PM
To: xml-dev@lists.xml.org
Subject: [xml-dev] Schema validation question

I have been out of the XML world for a little while now, but someone just
asked me a question and I have to admit, it's going to keep me up tonight if
I can't come up with a better solution.  And I'm a little rusty, to boot...

The issue is one of data dependency and validation.  The goal is to enforce
a restriction on pairs of data values- if the data associated with the node
<Fruit><Name> is "Apple", then the value of the sibling node <Fruit><Abbrev>
must be "APL".  Effectively, the goal is to enforce a specific mapping from
one enum into another within an XML document. The only way my associate
could figure to capture this dependency is as follows:

<xs:complexType name="Fruit">
		<xs:documentation>Defines the valid values for fruit
		<xs:element name="APL" type="xs:token" fixed="Apple"/>
		<xs:element name="ORG" type="xs:token" fixed="Orange"/>
		<xs:element name="BAN" type="xs:token" fixed="Banana"/>
		<xs:element name="LEM" type="xs:token" fixed="Lemon"/>
		<xs:element name="GRP" type="xs:token" fixed="Grape"/>

All in all, this strikes me as a very ugly, even offensive, solution.  My
initial response was to forget about the validation- it wasn't worth it.  Is
there a way to preserve the data dependency validation without warping the
instance document as the above schema fragment would require?


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