我希望能够为多种扩展类型指定单选类型.
例如,说我们有海,在海里有很多种鱼.所以在XML中我会写：
<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Fish本身而不是其扩展类型.
使用
element substitution group ……
原文链接：https://www.f2er.com/xml/293042.htmlXSD
<?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>
