XSD - enumeration -Restrictions on a Set of Values of a element

Restrictions on a Set of Values

To limit the content of an XML element to a set of acceptable values, we would use the enumeration constraint.

The example below defines an element called "Color" with a restriction. The only acceptable values are: green, red, blue:

<?xml version="1.0" encoding="windows-1252" ?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.example.org"

            targetNamespace="http://www.example.org" elementFormDefault="qualified">

  <xsd:element name="SomeElement">

    <xsd:complexType>

      <xsd:sequence>

        <xsd:element name="Color" type="xsd:colorT"/>

        <xsd:element name="code" type="xsd:string"/>

      </xsd:sequence>

    </xsd:complexType>

  </xsd:element>

      <xsd:simpleType name="colorT">

      <xsd:restriction base="xsd:string">

        <xsd:enumeration value="green"/>

        <xsd:enumeration value="red"/>

        <xsd:enumeration value="blue"/>

      </xsd:restriction>

    </xsd:simpleType>

</xsd:schema>