想象一下,我有以下复杂类型:
<xs:complexType name="pet">
<xs:sequence>
<xs:element name="add" type="xs:string" minOccurs="1" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
<xs:complexType name="pets">
<xs:sequence>
<xs:element name="dogs" type="pet" minOccurs="0" maxOccurs="1" />
<xs:element name="cats" type="pet" minOccurs="0" maxOccurs="1" />
<xs:element name="hamsters" type="pet" minOccurs="0" maxOccurs="1" />
<xs:element name="horses" type="pet" minOccurs="0" maxOccurs="1" />
</xs:sequence>
</xs:complexType>
这意味着我可以像这样指定我的xml:
<pets>
<dogs>
<add>Fido</add>
<add>Pluto</add>
</dogs>
<cats>
<add>Zorro</add>
<add>Batman</add>
</cats>
<hamsters>
<add>Bob</add>
</hamsters>
<horses>
<add>Mr Horse</add>
</horses>
</pets>
但我真正想做的是让我的架构要求至少定义了一个pet
类型。如果我将pets
类型更改为:
<xs:complexType name="pets">
<xs:choice minOccurs="1" maxOccurs="unbounded">
<xs:element name="dogs" type="pet" />
<xs:element name="cats" type="pet" />
<xs:element name="hamsters" type="pet" />
<xs:element name="horses" type="pet" />
</xs:choice>
</xs:complexType>
这种方式使其有效,因为现在要求我至少定义了一个pet
。但是,现在有多个pet
个相同类型的元素是有效的。这是我想要避免的。以下内容现在有效:
<pets>
<dogs>
<add>Pluto</add>
</dogs>
<dogs>
<add>Fido</add>
</dogs>
</pets>
那么,每种类型只能接受一个pet
元素吗?
答案 0 :(得分:0)
@ 5gon12eder的行suggested:
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="pets">
<xs:complexType>
<xs:choice>
<xs:sequence>
<xs:element name="dogs" type="pet"/>
<xs:element name="cats" type="pet" minOccurs="0"/>
<xs:element name="hamsters" type="pet" minOccurs="0"/>
<xs:element name="horses" type="pet" minOccurs="0"/>
</xs:sequence>
<xs:sequence>
<xs:element name="cats" type="pet"/>
<xs:element name="dogs" type="pet" minOccurs="0"/>
<xs:element name="hamsters" type="pet" minOccurs="0"/>
<xs:element name="horses" type="pet" minOccurs="0"/>
</xs:sequence>
<xs:sequence>
<xs:element name="hamsters" type="pet"/>
<xs:element name="dogs" type="pet" minOccurs="0"/>
<xs:element name="cats" type="pet" minOccurs="0"/>
<xs:element name="horses" type="pet" minOccurs="0"/>
</xs:sequence>
<xs:sequence>
<xs:element name="horses" type="pet"/>
<xs:element name="dogs" type="pet" minOccurs="0"/>
<xs:element name="cats" type="pet" minOccurs="0"/>
<xs:element name="hamsters" type="pet" minOccurs="0"/>
</xs:sequence>
</xs:choice>
</xs:complexType>
</xs:element>
<xs:complexType name="pet">
<xs:sequence>
<xs:element name="add" type="xs:string" minOccurs="1" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:schema>
使用xs:assert
确保至少有一个pets
的孩子:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning" vc:minVersion="1.1">
<xs:element name="pets">
<xs:complexType>
<xs:sequence>
<xs:element name="dogs" type="pet" minOccurs="0"/>
<xs:element name="cats" type="pet" minOccurs="0"/>
<xs:element name="hamsters" type="pet" minOccurs="0"/>
<xs:element name="horses" type="pet" minOccurs="0"/>
</xs:sequence>
<xs:assert test="*"/>
</xs:complexType>
</xs:element>
<xs:complexType name="pet">
<xs:sequence>
<xs:element name="add" type="xs:string" minOccurs="1" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:schema>