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The union Element

Definition and Usage

The union element defines a simple type as a collection (union) of values from specified simple data types.

Element Information

• Parent elements: simpleType

Syntax

<union
id=ID
memberTypes="list of QNames"
any attributes
>

(annotation?,(simpleType*))

</union>

(The ? sign declares that the element can occur zero or one time inside the union element)

Example 1

This example shows a simple type that is a union of two simple types:

<xsd:element name="jeans_size">
  <xsd:simpleType>
    <xsd:union memberTypes="sizebyno sizebystring" />
  </xsd:simpleType>
</xsd:element>

<xsd:simpleType name="sizebyno">
  <xsd:restriction base="xsd:positiveInteger">
    <xsd:maxInclusive="42"/>
  </xsd:restriction>
</xsd:simpleType>

<xsd:simpleType name="sizebystring">
  <xsd:restriction base="xsd:string">
    <xsd:enumeration value="small"/>
    <xsd:enumeration value="medium"/>
    <xsd:enumeration value="large"/>
  </xsd:restriction>
</xsd:simpleType>

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