根据 xsd 中的父母年龄验证孩子的年龄 [英] Validating the child's age against the parents age in xsd

问题描述

我有一个像下面这样的 xml

I have an xml like below

<parents>
  <mother name="MMM" age="55" />
  <children>
      <child name="CCC" gender="male" age="25" />
  </children>
</parents>

要验证母亲的年龄或孩子的年龄，我们可以像下面这样编写 xsd

To validate mother's age or Child's age we can write the xsd like below

<xs:element name="mother">
    <xs:complexType>
        <xs:attribute name="name" type="xs:string"/>
        <xs:attribute name="age">
            <xs:simpleType>
                <xs:restriction base="xs:integer">
                <xs:minInclusive value="0"/>
                <xs:maxInclusive value="120"/>
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>
</xs:element>

但是如果我要验证孩子的年龄，哪个不应该超过母亲的年龄?

But If I want to validate the child's age, which should not be more than mother's age?

推荐答案

来自 Wiki:

XSD 不提供任何工具来声明一个的值或存在属性取决于其他属性的值或存在(所谓的共现约束).

XSD provides no facilities to state that the value or presence of one attribute is dependent on the values or presence of other attributes (so-called co-occurrence constraints).

这正是您想要的:根据母亲的年龄值限制孩子的年龄值.因此，不幸的是，不可能使用 XML Schema 1.0.

And that's exactly what you want: restrict the value of child's age based on value of mother's age. So it's not possible to do with XML Schema 1.0, unfortunately.

不过，可以用 XML Schema 1.1 来做这样的事情(非常粗略的例子，只是为了展示概念):

It's possible to do with XML Schema 1.1, though, by something like this (very rough example, just to show the concept):

<xs:assert test="@age < ../../mother[@age]"/>

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