这个 XSD 限制是什么意思。具有限制的派生类型只是基类型的属性

Question

有一个基本类型“Objectnummering-e”和一个派生类型“ObjectNummering-geoBAG”。对“ObjectNummering-geoBAG”的限制提到了基本类型的属性。

我不清楚这是做什么的。对我来说，这两种类型是相同的。但他们是吗？

<complexType name="ObjectNummering-geoBAG">
   <simpleContent>
      <restriction base="BG:ObjectNummering-e">
         <attribute ref="StUF:noValue"/>
       </restriction>
   </simpleContent>
</complexType>


<complexType name="ObjectNummering-e">
   <simpleContent>
      <extension base="BG:ObjectNummering">
         <attributeGroup ref="StUF:element"/>
      </extension>
   </simpleContent>
</complexType>


<simpleType name="ObjectNummering">
    <restriction base="string">
       <length value="16"/>
    </restriction>
</simpleType>

<attributeGroup name="element">
    <attribute ref="StUF:noValue"/>
    <attribute ref="StUF:exact"/>
 </attributeGroup>

Answer 1

一如既往，回答此类问题的唯一可靠方法是查阅 W3C 规范。您的复杂类型是 'complex type with simple content'，因此相关部分是：

https://www.w3.org/TR/xmlschema-1/#declare-type，小节Complex Type Definition with simple content Schema Component

3 if the type definition ·resolved· to by the ·actual value· of the base [attribute] is a complex type definition, the {attribute uses} of that type definition, unless the alternative is chosen, in which case some members of that type definition's {attribute uses} may not be included, namely those whose {attribute declaration}'s {name} and {target namespace} are the same as one of the following: 3.1 the {name} and {target namespace} of the {attribute declaration} of an attribute use in the set per clause 1 or clause 2 above; 3.2 what would have been the {name} and {target namespace} of the {attribute declaration} of an attribute use in the set per clause 1 above but for the ·actual value· of the use [attribute] of the relevant among the [children] of being prohibited.

用简单的英语来说，这意味着复杂类型限制必须重新声明它想要保留的任何属性——它们不会自动继承。所以派生类型“ObjectNummering-geoBAG”只有 1 个属性，而不是 2 个。

这个 XSD 限制是什么意思。具有限制的派生类型只是基类型的属性

What does this XSD restriction mean. Derived type with restriction just an attribute of the base type

xsd