我试图用minOccurs和maxOccurs限制 choice 元素中的元素,但它看起来不像它正在工作。
我创造了一个选择并试图限制" person"至少发生1次,"地址"到1出现最小值,但是当我尝试验证一个包含2个出现的" person"和#34;地址"出现,我使用的验证器(Xerces)说它有效。
我想做的是正确的吗? 有没有办法强制在选择中出现一个元素?
以下是我的XSD和XML:
mySchema.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="family">
<xs:complexType>
<xs:choice maxOccurs="unbounded">
<xs:element name="person" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="age" type="xs:int"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="address" type="xs:string" minOccurs="1"/>
</xs:choice>
</xs:complexType>
</xs:element>
instance.xml
<?xml version="1.0" encoding="UTF-8"?>
<family>
<person>
<name> Kurtis </name>
<firstname> John </firstname>
<age> 35 </age>
</person>
<person>
<name> Kurtis </name>
<firstname> Helena </firstname>
<age> 33 </age>
</person>
</family>
提前感谢您的回答!
答案 0 :(得分:3)
实际上<xs:element name="person" maxOccurs="1">
应该是不必要的,<xs:element name="person">
应该是enougn。
<xs:choice maxOccurs="unbounded">
是两个人被评价为好的原因,只需尝试<xs:choice>
。
在<xs:element name="address" type="xs:string" minOccurs="1"/>
中,您应该添加maxOccurs属性<xs:element name="address" type="xs:string" minOccurs="1" maxOccurs="unbounded" />
编辑:
你可以做这样的事情:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="family">
<xs:complexType>
<!-- Choice between one "person" element and one or more "address" element. They cannot occur simultaneously because of choice -->
<xs:choice>
<xs:element name="person">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="age" type="xs:int"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="address" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>
在这种情况下,一个人的xml将验证
<?xml version="1.0" encoding="UTF-8"?>
<family xsi:noNamespaceSchemaLocation="Untitled4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<person>
<name>String</name>
<firstname>String</firstname>
<age>0</age>
</person>
</family>
或包含许多地址元素的xml将验证
<?xml version="1.0" encoding="UTF-8"?>
<family xsi:noNamespaceSchemaLocation="Untitled4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<address>a</address>
<address>b</address>
<address>c</address>
</family>
带有两个人的XML不会像一个人和一些地址元素那样验证XML(因为选择结构)。
如果您需要在一个XML中同时包含person和address元素,则应将选项更改为序列,如下所示
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="family">
<xs:complexType>
<xs:sequence>
<!-- Only 0 or 1 "person element might appear -->
<xs:element name="person" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="age" type="xs:int"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- followed by many "address" elements -->
<xs:element name="address" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
所以,例如以下xml将验证
<?xml version="1.0" encoding="UTF-8"?>
<family xsi:noNamespaceSchemaLocation="Untitled4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<person>
<name>String</name>
<firstname>String</firstname>
<age>0</age>
</person>
<address>String</address>
<address>String</address>
<address>String</address>
</family>
以及
<?xml version="1.0" encoding="UTF-8"?>
<family xsi:noNamespaceSchemaLocation="Untitled4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<address>String</address>
<address>String</address>
<address>String</address>
</family>
我之前的例子中可能只有0或1个“person”元素,并且它必须是所有元素中的第一个,因为序列强制执行此顺序。
如果您需要地址元素可以在person元素之前,则需要将模型更改为all。但不幸的是,在这个模型中你不能有更多的元素出现,所以你应该将地址元素“包装”到另一个元素中,如
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="family">
<xs:complexType>
<xs:all>
<!-- Only 0 or 1 "person element might appear -->
<xs:element name="person" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string"/>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="age" type="xs:int"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- or many "address" elements packed into "addresses" element-->
<xs:element name="addresses">
<xs:complexType>
<xs:sequence>
<xs:element name="address" type="xs:string" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
</xs:schema>
在这种情况下,以下XML将验证
示例1
<?xml version="1.0" encoding="UTF-8"?>
<family xsi:noNamespaceSchemaLocation="Untitled4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<person>
<name>String</name>
<firstname>String</firstname>
<age>0</age>
</person>
<addresses>
<address>String</address>
<address>String</address>
<address>String</address>
</addresses>
</family>
示例2
<?xml version="1.0" encoding="UTF-8"?>
<family xsi:noNamespaceSchemaLocation="Untitled4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<addresses>
<address>String</address>
<address>String</address>
<address>String</address>
</addresses>
<person>
<name>String</name>
<firstname>String</firstname>
<age>0</age>
</person>
</family>
示例3
<?xml version="1.0" encoding="UTF-8"?>
<family xsi:noNamespaceSchemaLocation="Untitled4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<addresses>
<address>String</address>
<address>String</address>
<address>String</address>
</addresses>
</family>