XML Schema extension element
Definition and usage
The extension element extends the elements of simpleType or complexType.
Element information
| Occurrence times | Once |
| Parent element | complexContent |
| Content | annotation、attribute、attributeGroup、anyAttribute、choice、all、sequence、group |
Grammar
<extension id=ID base=QName any attributes > (annotation?,((group|all|choice|sequence)?, ((attribute|attributeGroup)*,anyAttribute?))) </extension>
| Attribute | Paglalarawan |
|---|---|
| id | Opisyal. Tumutukoy sa tanging ID ng elemento. |
| base | Mga kinakailangan. Tumutukoy sa pangalan ng inbuild data type, simpleType o complexType elemento. |
| xml:lang | Opisyal. Tumutukoy sa wika na ginamit sa nilalaman. |
（Ang ? simbolo ay idinisenyo sa loob ng extension elemento, ang elemento na ito ay maaaring lumabas nang walang beses o isang beses, ang * simbolo ay idinisenyo na ang elemento na ito ay maaaring lumabas nang walang beses o marami beses.）
Mga halimbawa
Halimbawa 1
Ang halimbawa na ito ay nagdagdag ng attribute upang palawakin ang isang existing na simpleType:
<?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>
Halimbawa 2
Ang halimbawa na ito ay nagdagdag ng tatlong elemento upang palawakin ang isang existing na complexType:
<?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>
