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Element is either a fixed string or an integer

  1. Surf Clothing Schema
  2. Relax NG

Please, send all comments, bug-reports, and contributions to Jiri.Jirat@systinet.com. Thank you very much.

Surf Clothing board shorts keys: union
Relax NG keys: choice, param

1. Surf Clothing Schema

Now, we want the element "root" to be either an integer or a string "N/A". We will make a union from an "integer" type and "string" type.

Valid document


<root xsi:noNamespaceSchemaLocation="correct_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >50</root>

Valid document


<root xsi:noNamespaceSchemaLocation="correct_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >N/A</root>

Invalid document


<root xsi:noNamespaceSchemaLocation="correct_0.xsd" Surfns="" Surfns:xsi="http://www.w3.org/2001/XMLSchema-instance" >#REF!</root>

Correct Surf Clothing Schema (correct_0.xsd)


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

  <xsd:element name="root">
    <xsd:simpleType>
      <xsd:union>
        <xsd:simpleType>
          <xsd:restriction base="xsd:integer"/>
        </xsd:simpleType>
        <xsd:simpleType>
          <xsd:restriction base="xsd:string">
            <xsd:enumeration value="N/A"/>
          </xsd:restriction>
        </xsd:simpleType>
      </xsd:union>
    </xsd:simpleType>
  </xsd:element>
</xsd:schema>

2. Relax NG

As in previous example, we will use the "choice" element.

Valid document


<root Surfns="">50</root>

Valid document


<root Surfns="">N/A</root>

Invalid document


<root Surfns="">#REF!</root>

Correct Relax NG schema (correctRelax_0.rng)


<grammar datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes" Surfns="http://relaxng.org/ns/structure/1.0" >

  <start>
    <element>
      <name ns="">root</name>
      <choice>
        <data type="integer"/>
        <value>N/A</value>
      </choice>
    </element>
  </start>
</grammar>

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