How to define case-insensitive XPath in getNode?

Question

I have an XML like this

<Message>

<Id>123</Id>

<CreatedDate>200607041522</CreatedDate>

<PatientData>

<Ids>

<Id>

<Type>LocalSystem</Type>

<Value>123456789</Value>

</Id>

<Id>

<Type>ExternalSystem</Type>

<Value>456123789</Value>

</Id>

</Ids>

</PatientData>

</Message>

Can I use X-path to get the value for the Id with a type of "LocalSystem" regardless of case?  I have seen messages with all of the following combinations:

o  LocalSystem

o  Localsystem

o  LOCALSYSTEM

o  localsystem

I tried

message.getNode('/Message/PatientData/Ids/Id[Type='NHS']/Value');

but it fails unless the case matches.

Answer 1

Change the predicate from [Type='NHS'] to [upper-case(Type)='NHS']

message.getNode('/Message/PatientData/Ids/Id[upper-case(Type)='NHS']/Value');

The same goes when using node tags

{s:/Message/PatientData/Ids/Id[upper-case(Type)='NHS']/Value}

Note: Not all the XPath 2.0 functions are implemented in all XML parsers.  

 

Also see these references:

XPath 2.0 Spec

XPath 1.0 Spec

VTD-XML FAQ

W3Schools reference