我想编写一个接受 XML 文档的模式,如下所示:
<plugin>
<label text="blabla" />
<line />
<break />
<textbox name="mytextbox" length="8" required="true" />
<checkbox name="mycheckbox" checked="true" />
<combobox name="mycombo">
<option value="one">Option One</option>
<option value="two" selected="true">Option One</option>
</combobox>
<break />
</plugin>
所以我希望插件包含集合 {combobox,checkbox,textbox,label,line,break} 的元素。我已经写了这个 XSD,但这是错误的:
<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="plugin">
<xs:complexType>
<xs:sequence>
<xs:choice>
<xs:element name="line" />
<xs:element name="break" />
<xs:element name="label">
<xs:complexType>
<xs:attribute name="text" type="xs:string" />
<xs:attribute name="bold" type="xs:boolean" />
<xs:attribute name="width" type="xs:positiveInteger" />
</xs:complexType>
</xs:element>
<xs:element name="textbox">
<xs:complexType>
<xs:attribute name="name" type="xs:string" />
<xs:attribute name="width" type="xs:positiveInteger" />
<xs:attribute name="text" type="xs:string" />
<xs:attribute name="length" type="xs:positiveInteger" />
<xs:attribute name="required" type="xs:boolean" />
</xs:complexType>
</xs:element>
<xs:element name="combobox">
<xs:complexType>
<xs:sequence>
<xs:element name="option" nillable="true" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:simpleContent msdata:ColumnName="option_Text" msdata:Ordinal="2">
<xs:extension base="xs:string">
<xs:attribute name="value" type="xs:string" />
<xs:attribute name="selected" type="xs:boolean" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="name" type="xs:string" />
<xs:attribute name="width" type="xs:positiveInteger" />
</xs:complexType>
</xs:element>
<xs:element name="checkbox">
<xs:complexType>
<xs:attribute name="name" type="xs:string" />
<xs:attribute name="checked" type="xs:boolean" />
<xs:attribute name="text" type="xs:string" />
<xs:attribute name="width" type="xs:positiveInteger" />
</xs:complexType>
</xs:element>
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element ref="plugin" />
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>
我已经使用此验证器工具对其进行了测试...
但它说:
“cvc-complex-type.2.4.d:发现以元素'line'开头的无效内容。此时不应有子元素。”
所以……怎么了?我不明白这个消息。什么子元素在什么时候?