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

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开发者_JAVA百科 sender should be acknowledged with the error, if that particular value is sent.

Is it possible to specify this restriction?

I'm no regex expert, 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>

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.