XML Schema 参考手册 完整 XML Schema 参考手册 The extension element extends the elements of simpleType or complexType. 父元素： SimpleContent, complexContent (? The symbol is declared within the extension element, which can only appear zero or once, and the* symbol declares that the element can occur zero or more times. ) Attribute Description Id Optional. Specifies the unique ID of the element. Base Necessary. Specifies the built-in data type, the name of the simpleType or complexType element. Xml:lang Optional. Specifies the language used in the content. The following example extends an existing simpleType by adding attributes: The following example extends an existing complexType element by adding three elements:Definition and usage ¶
Element information ¶
Grammar ¶
<extension
id=ID
base=QName
*any attributes*
>
(annotation?,((group|all|choice|sequence)?,
((attribute|attributeGroup)*,anyAttribute?)))
</extension>
Example 1 ¶
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:simpleType name="size">
<xs:restriction base="xs:string">
<xs:enumeration value="small" />
<xs:enumeration value="medium" />
<xs:enumeration value="large" />
</xs:restriction>
</xs:simpleType>
<xs:complexType name="jeans">
<xs:simpleContent>
<xs:extension base="size">
<xs:attribute name="sex">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="male" />
<xs:enumeration value="female" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:schema>
Example 2 ¶
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="employee" type="fullpersoninfo"/>
<xs:complexType name="personinfo">
<xs:sequence>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="fullpersoninfo">
<xs:complexContent>
<xs:extension base="personinfo">
<xs:sequence>
<xs:element name="address" type="xs:string"/>
<xs:element name="city" type="xs:string"/>
<xs:element name="country" type="xs:string"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:schema>