# XML Schema redefine Element

Complete XML Schema Reference

## Definition and Usage

The redefine element redefines simple and complex types, groups, and attribute groups from an external schema.

### Element Information

- Parent elements: schema

### Syntax

<redefine
id=ID
schemaLocation=anyURI
any attributes
>
(annotation|(simpleType|complexType|group|attributeGroup))*
</redefine>

Attribute | Description
--- | ---
id | Optional. Specifies a unique ID for the element
schemaLocation | Required. A URI to the location of a schema document
any attributes | Optional. Specifies any other attributes with non-schema namespace

### Example 1

The following example shows a schema, Myschama2.xsd, with elements specified by the Myschama1.xsd. The pname type is redefined. According to this schema, elements constrained by the pname type must end with a "country" element:

Myschema1.xsd:
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:complexType name="pname">
<xs:sequence>
<xs:element name="firstname"/>
<xs:element name="lastname"/>
</xs:sequence>
</xs:complexType>
<xs:element name="customer" type="pname"/>
</xs:schema>
Myschema2.xsd:
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:redefine schemaLocation="Myschema1.xsd">
<xs:complexType name="pname">
<xs:complexContent>
<xs:extension base="pname">
<xs:sequence>
<xs:element name="country"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:redefine>
<xs:element name="author" type="pname"/>
</xs:schema>

Complete XML Schema Reference

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