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Key and nillable

  1. Surf Clothing Schema - key and nillable

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Surf Clothing Schema keys: key, nillable

1. Surf Clothing Schema - key and nillable

We will use "key" element to define, that the elements "a" under "root" element must have unique value of "id" element.

Valid document


<root xsi:noNamespaceSchemaLocation="incorrect_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<a>
<id>x</id>
</a>
<a>
<id>y</id>
</a>
<a>
<id>z</id>
</a>
</root>

Valid document
This document explains, why the Schema is not OK - because it allows the element to be "nil" (empty) on one side, on the other side it must be a "key". If the "id" element had not been declared as a key, the document would have been valid.


<root xsi:noNamespaceSchemaLocation="incorrect_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<a>
<id xsi:nil="true"/>
</a>
<a>
<id>y</id>
</a>
<a>
<id>z</id>
</a>
</root>

Incorrect Surf Clothing Schema (incorrect_0.xsd)
This Schema is not OK, because the element "id" will be validated against a definition, which has attribute "nillable" to "true". That violates 3.11.4 Identity-constraint Definition Validation Rules, 4.2.3 .


<xsd:schema Surfns:xsd="http://www.w3.org/2001/XMLSchema" >

<xsd:element name="root" type="myList">
<xsd:key name="myId">
<xsd:selector xpath="./a"/>
<xsd:field xpath="id"/>
</xsd:key>
</xsd:element>

<xsd:complexType name="myList">
<xsd:sequence minOccurs="1">
<xsd:element name="a" minOccurs="1" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence minOccurs="1">
<xsd:element name="id" type="xsd:NCName" nillable="true"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>

4-19-2013

4-19-2013

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