xsd：限制一個屬性大於其他（相對驗證）

Question

我正在尋找一種方法來根據伴侶屬性valid-from限制輸入屬性valid-till。

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> 
    <xs:complexType name="Data"> 
     <xs:sequence> 
     <xs:element name="material" type="Material" maxOccurs="unbounded" /> 
     </xs:sequence> 
     <xs:attribute name="id" type="xs:ID" /> 
     <xs:attribute name="valid-from" type="xs:dateTime" /> 
     <xs:attribute name="valid-till" type="xs:dateTime" /> 
    </xs:complexType> 
</xs:schema> 

我該如何實現這個目標？

Answer 1

也許最好的開始方式是做一個網頁搜索或者在Stack Overflow上搜索。看到任何或所有

• Is there any way in xml schema to let an attribute always be greater than another one in an xml element?
• Validating the child's age against the parents age in xsd
• XSD assertions conditioned by the existence of attributes
• Restrict attribute value depending on value of another attribute
• XSD: Define attributes based on the value of previous attribute
• XML schema attribute dependancies

或者對 'XSD斷言'​​ 搜索，'xsd assert'，'xsd co-occurrence constraint'。