How to exclude an enumeration value in XML file using XSD?

Question

Is it possible to specify the value of a tag or attribute should not be like some_value ?

I have a strange requirement, where the xsd isn't aware of the values being sent to it. The value of that particular tag can be a string with any value except one value ( say data_migration).

The sender should be acknowledged with the error, if that particular value is sent.

Is it possible to specify this restriction?

Answer 1

Use regular expressions to specify a pattern or as in your case what a pattern should not contain.

http://www.w3schools.com/schema/schema_facets.asp

Answer 2

I don't know if you can specifically exclude a value. I'm not sure if this helps, but you can create two separate enumerations and then create the union of the enumerations.

<xsd:simpleType name="IncludedEnumType">
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="pending" />
        <xsd:enumeration value="in_process" />
        <xsd:enumeration value="failed" />
        <xsd:enumeration value="unknown" />
    </xsd:restriction>
</xsd:simpleType>

<xsd:simpleType name="ExcludedEnumType">
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="data_migration" />
    </xsd:restriction>
</xsd:simpleType>

<xsd:simpleType name="CombinedEnumType">
    <xsd:union memberTypes="IncludedEnumType ExcludedEnumType" />
</xsd:simpleType>

You would use either IncludedEnumType or CombinedEnumType as necessary. Using the IncludedEnumType would obviously excluded the values in ExcludedEnumType.

This approach uses Solution 2 from this article by IBM.

Answer 3

I´m no expert on regex, but this simpleType makes everything starting with data_migration invalid.

<xs:simpleType name ="notDataMigration">
    <xs:restriction base ="xs:string">
      <xs:pattern value ="^(?!data_migration).*" />
    </xs:restriction>
  </xs:simpleType>