Specifying a Set of Acceptable Values : enumeration « XML Schema « XML Tutorial

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XML Tutorial » XML Schema » enumeration 
3. 66. 1. Specifying a Set of Acceptable Values
<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
  targetNamespace="http://www.java2java.com" xmlns="http://www.java2java.com"
  elementFormDefault="qualified">

  <xsd:element name="continent">
    <xsd:simpleType>
      <xsd:restriction base="xsd:string">
        <xsd:enumeration value="Asia" />
        <xsd:enumeration value="Africa" />
        <xsd:enumeration value="Australia" />
        <xsd:enumeration value="Europe" />
        <xsd:enumeration value="North America" />
        <xsd:enumeration value="South America" />
        <xsd:enumeration value="Antartica" />
      </xsd:restriction>
    </xsd:simpleType>
  </xsd:element>
</xsd:schema>


Data.xml: The continent element can now contain any single one of these values. 
<?xml version="1.0"?>
<continent>Asia</continent>

You can use the xsd:enumeration facet with all simple types except boolean.
Each enumeration value must be unique.
Enumeration values may contain white space.
3. 66. enumeration
3. 66. 1. Specifying a Set of Acceptable Values
3. 66. 2. enumeration Constrains the value of the data type to a defined set of values
3. 66. 3. Enumeration limits a value space to a specific set of values - if a value isn't specified in the set in the schema, it isn't valid.
3. 66. 4. Enumerating A Simple Type
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