I know that the selector of these elements has a scope relative to the element being declared, but maybe there is a way to get beyond bounds of this scope or maybe just a way to extend base element?
Here’s a working example:
- <xs:schema id="schema"
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targetNamespace="http://tempuri.org/schema.xsd"
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elementFormDefault="qualified"
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xmlns="http://tempuri.org/schema.xsd"
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xmlns:mstns="http://tempuri.org/schema.xsd"
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xmlns:xs="http://www.w3.org/2001/XMLSchema">
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<xs:element name="element" abstract="true" type="TElement"/>
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<xs:element name="local" type="TLocal" substitutionGroup="element"/>
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<xs:element name="root" type="TRoot">
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<!--declaring constraint within TRoot (root element of any document)-->
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<xs:unique name="local-name-constraint">
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<xs:selector xpath=".//mstns:local"/>
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<xs:field xpath="@name"/>
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</xs:unique>
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</xs:element>
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<xs:complexType name="TElement" abstract="true">
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</xs:complexType>
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<xs:complexType name="TRoot">
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<xs:complexContent>
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<xs:extension base="TElement">
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<xs:sequence>
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<xs:element ref="element" maxOccurs="unbounded"/>
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</xs:sequence>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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<xs:complexType name="TLocal">
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<xs:complexContent>
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<xs:extension base="TElement">
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<xs:sequence>
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<xs:element ref="element" minOccurs="0" maxOccurs="unbounded"/>
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</xs:sequence>
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<xs:attribute name="name" use="required" type="xs:string"/>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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</xs:schema>
…and XML document
- <root xmlns="http://tempuri.org/schema.xsd">
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<local name="a"/>
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<local name="b">
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<local name="a"/>
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</local>
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</root>
It works and I’ve got notified that there is a duplicate key sequence. But what if I have an extension to this schema where I declared another element:
- <root xmlns="http://tempuri.org/schema.xsd"
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xmlns:e="http://tempuri.org/ext.xsd">
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<local name="one">
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<e:extended key="next"/>
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</local>
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<local name="two">
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<local name="one"/>
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<e:extended key="next"/>
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</local>
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</root>
- <xs:schema id="ext"
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targetNamespace="http://tempuri.org/ext.xsd"
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elementFormDefault="qualified"
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xmlns="http://tempuri.org/ext.xsd"
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xmlns:mstns="http://tempuri.org/ext.xsd"
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xmlns:xs="http://www.w3.org/2001/XMLSchema"
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xmlns:base="http://tempuri.org/schema.xsd"
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>
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<xs:import namespace="http://tempuri.org/schema.xsd"
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schemaLocation="schema.xsd"/>
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<xs:element name="extended" type="TExtended" substitutionGroup="base:element">
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<xs:unique name="extended-key-constraint">
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<xs:selector xpath="I can't get to the root of the document here"/>
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<xs:field xpath="@key"/>
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</xs:unique>
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</xs:element>
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<xs:complexType name="TExtended">
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<xs:complexContent>
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<xs:extension base="base:TElement">
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<xs:sequence>
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<xs:element ref="base:element" minOccurs="0" maxOccurs="unbounded"/>
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</xs:sequence>
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<xs:attribute name="key" use="required" type="xs:string"/>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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</xs:schema>
How can I set uniqueness to the element from the schema extensions?
