在 XSD 中嵌套来自不同命名空间的 XML 元素 [英] Nesting XML elements from different namespaces in XSD

问题描述

假设我有一个命名空间元素的 XML 架构定义，我想将其用作第二个命名空间中 XML 元素的子元素.

Assume that I have an XML schema definition for elements of a namespace that I would like to use as child elements of XML elements within a second namespace.

举个例子，假设我们有文件 foo.xsd:

As an example, suppose we have file foo.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="urn:foo-ns" targetNamespace="urn:foo-ns"
           xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

  <xs:element name="foo" type="fooType"/>

  <xs:complexType name="fooType">
    <xs:attribute name="id" use="required"/>
  </xs:complexType>

</xs:schema>

以及文件bar.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="urn:bar-ns"
           targetNamespace="urn:bar-ns"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:foo-ns="urn:foo-ns"
           elementFormDefault="qualified">

  <xs:import namespace="urn:foo-ns" schemaLocation="foo.xsd"/>

  <xs:element name="bar" type="barType"/>

  <xs:complexType name="barType">
    <xs:sequence minOccurs="0" maxOccurs="unbounded">
      <xs:element name="foo" type="foo-ns:fooType"/>
    </xs:sequence>
    <xs:attribute name="name" use="required"/>
  </xs:complexType>

</xs:schema>

然后我希望以下文件 bar.xml 是有效的 XML:

Then I would have expected the following file bar.xml to be valid XML:

<?xml version="1.0" encoding="UTF-8"?>
<bar name="myBar" xmlns="urn:bar-ns">
  <foo id="myFoo" xmlns="urn:foo-ns"/>
</bar>

然而，我的 XML 验证器抱怨 foo 元素的命名空间声明；相反，它坚持以下文件是有效的:

However, my XML validator complains about the namespace declaration of the foo element; instead it insists that the following file is valid:

<?xml version="1.0" encoding="UTF-8"?>
<bar name="myBar" xmlns="urn:bar-ns">
  <foo id="myFoo"/>
</bar>

我是否错误地声明了我的架构文件?我将如何设置 XSD 以使 bar.xml 的初始版本有效?

Am I declaring my schema files incorrectly? How would I set up the XSDs in order for the initial version of bar.xml to be valid?

推荐答案

在 bar.xsd 中，您必须引用 element 而不是 type foo 声明，如果你希望 foo 在 urn:bar-ns 命名空间中:

In bar.xsd you have to reference the element not the type declaration of foo if you wish foo to be in the urn:bar-ns namespace:

      <xs:element ref="foo-ns:foo"/>

更新了 bar.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns="urn:bar-ns"
           targetNamespace="urn:bar-ns"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:foo-ns="urn:foo-ns"
           elementFormDefault="qualified">

  <xs:import namespace="urn:foo-ns" schemaLocation="foo.xsd"/>

  <xs:element name="bar" type="barType"/>

  <xs:complexType name="barType">
    <xs:sequence minOccurs="0" maxOccurs="unbounded">
      <xs:element ref="foo-ns:foo"/>
    </xs:sequence>
    <xs:attribute name="name" use="required"/>
  </xs:complexType>

</xs:schema>

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