How using XPath-JPath in CakePHP

Hi people,
In last days i am studing about XPath-JPath,the first is for Xml the
second for JSON,and how they are work.After understanding their
functionality i was wondering if it is possible and in what way I can
use Xpath/Jpath in Cake.In particular both are used for output data of
a xml or JSON file in a smart way. If any of you has used any of these
formulas or know how to build these plz let me informed.

ty in advance,
Paulos
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