xsd：限制一个属性大于其他（相对验证）

Question

我正在寻找一种方法来根据伴侣属性valid-from限制输入属性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> 

我该如何实现这个目标？

Answer 1

也许最好的开始方式是做一个网页搜索或者在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

或者对 'XSD断言'​​ 搜索，'xsd assert'，'xsd co-occurrence constraint'。