XSD 元素替换组示例? [英] XSD element substitution group example?
本文介绍了XSD 元素替换组示例?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我希望能够为多个扩展类型指定单一选择类型.
I'd like to be able to specify single choice type for multiple extending types.
比如说我们有海,海里有很多种鱼.所以在 XML 中我会写:
For example, say we have the sea, in the sea there are many kinds of fishes. So in XML I will write:
<Sea name="Atlantic Ocean">
<Tuna name="tuna1" />
<Carp name="carp1" />
<Carp name="carp2" />
<Tuna name="tuna2" />
<Salmon name="salmon1" />
</Sea>
XSD
<xs:complexType name="Fish">
</xs:complexType>
<xs:complexType name="Salmon">
<xs:complexContent>
<xs:extension base="Fish">
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="Carp">
<xs:complexContent>
<xs:extension base="Fish">
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="Tuna">
<xs:complexContent>
<xs:extension base="Fish">
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="Sea">
<xs:complexContent>
<xs:extension base="GeoZone">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:choice>
<xs:element type="Fish" name="Fish" minOccurs="0"
maxOccurs="unbounded"/>
</xs:choice>
</xs:sequence>
<xs:attribute name="Name" type="xs:string" use="optional" />
</xs:extension>
</xs:complexContent>
</xs:complexType>
不幸的是,这是无效的,因为我只能添加类型 Fish
本身,而不是它的扩展类型.
Unfortunately, that is not valid, as I can only add the type Fish
itself and not its extending types.
推荐答案
使用 元素替换组...
Use an element substitution group...
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Sea">
<xs:complexType>
<xs:sequence>
<xs:element ref="FishSubGroup"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="xs:string" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="FishSubGroup" abstract="true"/>
<xs:element name="Tuna" type="FishType" substitutionGroup="FishSubGroup"/>
<xs:element name="Carp" type="FishType" substitutionGroup="FishSubGroup"/>
<xs:element name="Salmon" type="FishType" substitutionGroup="FishSubGroup"/>
<xs:complexType name="FishType">
<xs:attribute name="name" type="xs:string"/>
</xs:complexType>
</xs:schema>
XML
<?xml version="1.0" encoding="UTF-8"?>
<Sea name="Atlantic Ocean">
<Tuna name="tuna1"/>
<Carp name="carp1"/>
<Carp name="carp2"/>
<Tuna name="tuna2"/>
<Salmon name="salmon1"/>
</Sea>
这篇关于XSD 元素替换组示例?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文