in reply to Update an XML node value based on one of the attribute values.

Using XML::XSH2, a wrapper around XML::LibXML: 
open file.xml ;
for //*[name()='ReferenceId'][@referenceIDType='FXDD'] set text() 'New
+ value' ;
save :b ;

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
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