How to check if an element exists in the XML using XPath?

Question

Below is my element hierarchy. How to check (using XPath) that AttachedXml element is present under CreditReport of Primary Consumer

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

Answer 1

Use the 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

If there is an AttachedXml in the CreditReport of primary Consumer, then it will return true().

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