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Re: XSD 1.1 assertions are a great mistery for me

• From: cmarchand@oxiane.com
• To: Michael Kay <mike@saxonica.com>
• Date: Wed, 29 Mar 2017 15:44:42 +0200

I suspect you have overlooked that the data model supplied as input to
the assertions is in effect the result of applying validation using
everything in the schema except the assertions. In consequence, the
fixed value of the @abstract attribute will be expanded, so tests like
exists(@abstract) will always be true.

Michael Kay
Saxonica

On 29 Mar 2017, at 14:20, cmarchand@oxiane.com wrote:

Hello !

I want to define a complex type that represents a parameter.
A parameter MUST have a @name
A parameter MAY have a @as
A parameter has either a @value, or a @abstract
A parameter that has a @abstract MUST have @as

I've defined this :

<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
elementFormDefault="qualified"
attributeFormDefault="unqualified"
vc:minVersion="1.1">

<xs:element name="data">
<xs:complexType>
<xs:sequence maxOccurs="unbounded">
<xs:element name="param" type="TParam"/>
</xs:sequence>
</xs:complexType>
</xs:element>

<xs:complexType name="TParam">
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="as" type="xs:string" use="optional"/>
<xs:attribute name="value" type="xs:string" use="optional"/>
<xs:attribute name="abstract" fixed="true" use="optional" />
<xs:assert test="count(@value | @abstract) eq 1" id="assert1"/>
<xs:assert test="if(exists(@abstract)) then exists(@as) else true()" id="assert2"/>
</xs:complexType>
</xs:schema>

And this file :

<data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="param.xsd">
<param name="p1" /> <!-- should fail assert1 -->
<param name="p2" value="v2"/> <!-- should be valid -->
<param name="p3" value="v3" as="xs:string"/> <!-- should be valid -->
<param name="p4" as="xs:string" abstract="true"/> <!-- should be valid -->
<param name="p5" abstract="true"/> <!-- should fail assert2 -->
<param name="p6" abstract="true" value="v6"/> <!-- should fail assert2 -->
</data>

All param except p4 are invalid.
p1 fails assert2
p2 fails assert1 & assert2
p3 fails assert2
p4 is valid
p5 fails assert2
p6 fails assert1 & assert2

I do not know what I miss... Any help will be much appreciated !

Best,
Christophe

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• References:
  • XSD 1.1 assertions are a great mistery for me
    • From: cmarchand@oxiane.com
  • Re: XSD 1.1 assertions are a great mistery for me
    • From: Michael Kay <mike@saxonica.com>