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Editorial Team
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Asked: 2026-05-13T20:09:40+00:00

Consider this XML – <Root> <Foo> <UniqueValue>A100</UniqueValue> </Foo> <Foo> <UniqueValue>A101</UniqueValue> </Foo> <Foo> <UniqueValue>B102</UniqueValue> </Foo>

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Consider this XML –

<Root>
  <Foo>
    <UniqueValue>A100</UniqueValue>
  </Foo>
  <Foo>
    <UniqueValue>A101</UniqueValue>
  </Foo>
  <Foo>
    <UniqueValue>B102</UniqueValue>
  </Foo>
  <Foo>
    <UniqueValue>A101</UniqueValue> <!-- This should be an error -->
  </Foo>
  <Foo>
    <UniqueValue> A101 </UniqueValue> <!-- This should be an error but not critical for now -->
  </Foo>
</Root>

How do I restrict the simple type element <UniqueValue> such that its values are unique?
Also not that I don’t want to restrict to numbers.

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1 Answer

  1. Editorial Team

    Try putting a uniqueness constraint on “Root”. Note that this needs to be ont he element definition, not a type definition:

    <xsd:element name="Root" type="RootType">
  <xsd:unique name="uniqueValues">
    <xsd:selector xpath="Foo"/>
    <xsd:field xpath="UniqueValue"/>
  </xsd:unique>
</xsd:element>

    Depending on the parser you are using, you may have to switch on additional options to get this validated (e.g. “full schema validation”, identity constraint validation, etc).

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