Name
xs:extension(simple content) — Extension of a simple content model.
Synopsis
<xs:extension base = xs:QName id = xs:ID {any attributes with non-schema namespace} > Content: (xs:annotation?, ((xs:attribute | xs:attributeGroup)*, xs:anyAttribute?)) </xs:extension>
May be included in: xs:simpleContent
Description
This element is used to extend either a simple type or a simple
content complex type into a simple content complex type (i.e., the
content model of an element with a text nodes and some attributes).
The type to extend is specified in the base
attribute, and the list of the attributes to add to the content model
is given as xs:attributes
,
xs:attributeGroup
, and
xs:anyAttribute
embedded in the
xs:extension
element.
Such a derivation by extension of a simple type is the only way to create a complex type simple content content model.
Restrictions
The definition of the base type cannot be embedded in the
xs:extension
element, and the base type needs to
be a global type.
The same element name (xs:extension
) is used by
W3C XML Schema for the extension of simple content and complex
content complex types with a different content model.
Example
<xs:element name="title"> <xs:complexType> <xs:simpleContent> <xs:extension base="string255"> <xs:attribute ref="lang"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element>
Attributes
-
base
Qualified name of the base type (simple type or simple content complex type).
-
id
W3C XML Schema’s element ID.
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