有两套不同属性的元素：如何申报XS？

Question

我的新XML私立语言包括元素<figure>，代表插图（图片+标题）。

每当插图在本地数据库是指一些像我只想类型

<figure id="9809" width="full" />

识别图像编号9809和其相关的标题。

在另一边，如果图像来自外部的我需要一个稍微不同的语法：

<figure href="https://some-url-here" width="full">Some ad hoc catpion</figure>

到目前为止，我已经宣布，结合两种行为，像这样的元素：

  <!-- Figures -->
  <xs:simpleType name="FigureWidthEnum">
    <xs:restriction base="xs:token">
      <xs:enumeration value="center" />
      <xs:enumeration value="half" />
      <xs:enumeration value="full" />
    </xs:restriction>
  </xs:simpleType>

  <xs:element name="figure">
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="Inline">
          <xs:attribute name="href" type="URI" />
          <xs:attribute name="id" type="xs:nonNegativeInteger" />
          <xs:attribute name="width" type="FigureWidthEnum" default="full" />
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>

它工作正常，但与3个属性和类型不可能的事情全新的编辑器可以胡来我不想通过架构验证容易。例如：

<figure id="9809" width="full" href="https://some-unexpected-url">Some unexpected caption that should not be here</figure>

我想为<figure>两个完全独立的sintaxes，因为如果我可以声明具有相同名称的这两个元素：

  <xs:element name="figure">
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="Inline">
          <xs:attribute name="href" type="URI" />
          <xs:attribute name="width" type="FigureWidthEnum" default="full" />
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>

  <xs:element name="figure">
    <xs:complexType>
      <xs:attribute name="id" type="xs:nonNegativeInteger" />
      <xs:attribute name="width" type="FigureWidthEnum" default="full" />
    </xs:complexType>
  </xs:element>

事实上，这是不可能的。

是否可以以某种方式做了什么？

Answer 1

是的，这是可能的XSD 1.1，它提供专门针对这些要求旨在<xs:alternative>元件。下面是我设计你需要验证准确完整的XML架构：

<?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">

  <!-- Figures -->
  <xs:simpleType name="FigureWidthEnum">
  <xs:restriction base="xs:token">
    <xs:enumeration value="center" />
      <xs:enumeration value="half" />
      <xs:enumeration value="full" />
    </xs:restriction>
  </xs:simpleType>

  <!-- stub definition -->
  <xs:complexType name="Inline"/>

  <!-- 'figure' element is declared once, but its type has two alternatives -->
  <xs:element name="figure">

    <!-- The first alternative is selected, when the condition specified
     in 'test' attribute is true. The condition must be a boolean XPath
     expression. The '@id' returns the value of 'id' attribute. However,
     when converted to boolean, it indicates whether 'id' attribute is
     specified at all. The anonymous complexType inside <xs:alternative>
     provides the element type valid for this case.
    -->
    <xs:alternative test="@id">
      <xs:complexType>
        <xs:attribute name="id" type="xs:nonNegativeInteger" />
        <xs:attribute name="width" type="FigureWidthEnum" default="full" />
      </xs:complexType>
    </xs:alternative>

    <!-- The second alternative has no 'test' attribute. That means, it must
     be selected by default, when all other alternatives (with a specified
     test condition) do not pass. Here, the anonymous complexType inside
     <xs:alternative> defines the element type in case of reference:
     when 'href' is present.
    -->
    <xs:alternative>
      <xs:complexType mixed="true">
        <xs:complexContent>
          <xs:extension base="Inline">
            <xs:attribute name="href" type="xs:anyURI" />
            <xs:attribute name="width" type="FigureWidthEnum" default="full" />
          </xs:extension>
        </xs:complexContent>
      </xs:complexType>
    </xs:alternative>
  </xs:element>

  <!-- this element is defined just to test the whole schema in XML below -->
  <xs:element name="figures">
    <xs:complexType>
      <xs:sequence>    
        <xs:element ref="figure" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>    
    </xs:complexType>
  </xs:element>

</xs:schema>

一个完整的XML文件，此架构验证：

<?xml version="1.0" encoding="UTF-8"?>
<figures>

  <!-- passes validation -->
  <figure id="9809" width="full" />

  <!-- passes validation -->
  <figure width="full" href="https://some-unexpected-url">Some ad hoc caption</figure>

  <!-- does not pass the validation -->
  <figure id="9809" width="full" href="https://some-unexpected-url">
    Some unexpected caption that should not be here
  </figure>

</figures>

验证用的Apache Xerces的2.11.0（XSD 1.1感知）来完成。

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促销附加。这些链接可能对那些XML模式和WSDL工作有趣：FlexDoc/XML XSDDoc＆WSDLDoc - 高性能通用的XML Schema / WSDL文档发电机与图表