XSD 元素

最新推荐文章于 2025-08-10 21:48:21 发布

转载最新推荐文章于 2025-08-10 21:48:21 发布 · 478 阅读

文章标签：

#schema #xml #文档 #encoding #components #file

The <any> element enables us to extend the XML document with elements not specified by the schema!
<any>元素可以使我们在XML文档中添加没有被schema 定义过的新元素从而扩充XML文档。

The <any> Element
<any>元素

The <any> element enables us to extend the XML document with elements not specified by the schema.
<any>元素可以使我们在XML文档中添加没有被schema 定义过的新元素从而扩充XML文档。

The following example is a fragment from an XML schema called "family.xsd". It shows a declaration for the "person" element. By using the <any> element we can extend (after <lastname>) the content of "person" with any element:
下面的例子是名为"family.xsd"的一份XML schema片段。它展示了"person"元素的声明。用上<any>元素，我们可以在"person"元素的内容里扩充任意元素（在<lastname>的后面）

<xs:element name="person">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="firstname" type="xs:string"/>

      <xs:element name="lastname" type="xs:string"/>
      <xs:any minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>

</xs:element>

Now we want to extend the "person" element with a "children" element. In this case we can do so, even if the author of the schema above never declared any "children" element.
现在我们想在"person"元素中添加"children"元素，即使这篇schema的作者从未声明过什么"children"元素，我们也可以做到。

Look at this schema file, called "children.xsd":
请看下面名为"children.xsd"的schema文件：

<?xml version="1.0" encoding="ISO-8859-1"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3schools.com"
xmlns="http://www.w3schools.com"
elementFormDefault="qualified">

<xs:element name="children">
  <xs:complexType>

    <xs:sequence>
      <xs:element name="childname" type="xs:string"
      maxOccurs="unbounded"/>
    </xs:sequence>

  </xs:complexType>
</xs:element>

</xs:schema>

The XML file below (called "Myfamily.xml"), uses components from two different schemas; "family.xsd" and "children.xsd":
下面的XML文件（叫做"Myfamily.xml"），用上了来自"family.xsd" 和"children.xsd"两篇不同schema的组件

<?xml version="1.0" encoding="ISO-8859-1"?>

<persons xmlns="http://www.microsoft.com"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:SchemaLocation="http://www.microsoft.com family.xsd
http://www.w3schools.com children.xsd">

<person>
<firstname>Hege</firstname>
<lastname>Refsnes</lastname>

<children>
  <childname>Cecilie</childname>
</children>
</person>

<person>
<firstname>Stale</firstname>

<lastname>Refsnes</lastname>
</person>

</persons>

The XML file above is valid because the schema "family.xsd" allows us to extend the "person" element with an optional element after the "lastname" element.
上述XML文件是有效的，因为"family.xsd" schema允许我们在"person"元素里的"lastname"元素后面扩充一个任意元素。

The <any> and <anyAttribute> elements are used to make EXTENSIBLE documents! They allow documents to contain additional elements that are not declared in the main XML schema.
<any> 和<anyAttribute>元素是用于制造可扩展文档的！它们允许文档含有没有在主要XML schema里声明过的其它新元素。