如何检查xml中是否存在元素使用xpath？

发布时间：2020-12-16 08:08:05 所属栏目：百科来源：网络整理

导读：下面是我的元素层次结构。如何检查(使用xpath)AttachedXml元素存在于主消费者的CreditReport下 Consumers xmlns="http://xml.mycompany.com/XMLSchema" Consumer subjectIdentifier="Primary" DataSources Credit CreditReport AttachedXml![CDATA[ blah bla

下面是我的元素层次结构。如何检查(使用xpath)AttachedXml元素存在于主消费者的CreditReport下

<Consumers xmlns="http://xml.mycompany.com/XMLSchema">
       <Consumer subjectIdentifier="Primary">
          <DataSources>
               <Credit>
                   <CreditReport>
                      <AttachedXml><![CDATA[ blah blah]]>

使用 boolean() XPath function

The boolean function converts its
argument to a boolean as follows:

a number is true if and only if
it is neither positive or negative
zero nor NaN

a node-set is true if and only if
it is non-empty

a string is true if and only if
its length is non-zero

an object of a type other than
the four basic types is converted to a
boolean in a way that is dependent on
that type

如果主消费者的CreditReport中有AttachedXml，那么它将返回true()。

boolean(/mc:Consumers
          /mc:Consumer[@subjectIdentifier='Primary']
            //mc:CreditReport/mc:AttachedXml)

（编辑：李大同）

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