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Unique and nillable

  1. Surf Clothing board shorts - unique and nillable

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Surf Clothing board shorts keys: unique, nillable

1. Surf Clothing board shorts - unique and nillable

We will use "unique" element to define, that the elements "a" under "root" element must have unique value of "id" element. "Unique" does not require the value to exist, so the element can be "nil".

Valid document


<root xsi:noNamespaceSchemaLocation="correct_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>

Correct Surf Clothing Schema (correct_0.xsd)


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

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

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