XSD 允许同一元素的 simpleType 和 complexType 内容? [英] XSD allowing both simpleType and complexType content for same element?
问题描述
我有一种情况，我有不同的 XML，它们将具有不同类型的属性.有时元素 HEADER 可能只有一个节点，或者某些 XML 可能在 HEADER 节点中包含元素并在其中包含值.
I have a situation where I have different XMLs that will have different types of properties. Sometimes the element HEADER could have just a node or some XMLs could have elements within the HEADER node and values inside.
示例 1(HEADER 仅包含文本):
Example 1 (HEADER with just text):
<Details HeaderLabel="DETAILS">
<HEADER Label="Header">2.5%</HEADER>
</Details>
示例 2(HEADER 有两个子元素):
Example 2 (HEADER with two child elements):
<Details HeaderLabel="DETAILS">
<HEADER Label="Header">
<HEAD Label="H1a">2.88%</HEAD>
<HEAD Label="H2b">3.24%</HEAD>
</HEADER>
</Details>
XSD 是这样工作的:这将验证 示例 1:
The XSD works as so: This will validate for example 1:
<xs:element name="HEADER">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="Label" type="xs:string" use="required" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
这将验证 示例 2:
<xs:element name="HEADER">
<xs:complexType>
<xs:sequence>
<xs:element maxOccurs="unbounded" name="HEAD">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="Label" type="xs:string" use="required" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Label" type="xs:string" use="required" />
</xs:complexType>
</xs:element>
我尝试使用 xs:choice 但它似乎效果不佳，或者我可能对如何在这种情况下实现选择没有清晰的了解.
I tried using xs:choice but it didn't seem to work well or maybe I don't have a clear understanding on how to implement choice in this situation.
推荐答案
在 XSD 中，你不能同时允许简单和复杂的内容，除非你愿意通过 mixed="true" 来混合元素和文本(在这种情况下不需要示例 1).您可以然后使用 XSD 1.1 断言来排除两者同时出现.
In XSD, you cannot allow both simple and complex content unless you're willing to have mix elements and text via mixed="true" (in this case Example 1 is not needed). You could then used XSD 1.1 assertions to exclude both from appearing simultaneously.
<xs:element name="HEADER">
<xs:complexType mixed="true">
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded" name="HEAD">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="Label" type="xs:string" use="required" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Label" type="xs:string" use="required" />
</xs:complexType>
</xs:element>
但是，您在这里逆流而上.相反，接受您确实有两个具有两种不同内容模型的不同实体，并以不同的方式命名不同的实体:SIMPLE_HEADER 和 COMPLEX_HEADER 浮现在脑海中.然后你可以在 Details 上使用 xs:choice/maxOccurs="unbounded" 让简单和复杂的 headers 可以自由穿插.
However, you're swimming against the current here. Instead, accept that you really have two different entities with two different content models and name the different entities differently: SIMPLE_HEADER and COMPLEX_HEADER comes to mind. Then you can use xs:choice/maxOccurs="unbounded" on Details to allow simple and complex headers to be freely interspersed.
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