[err4nt]

Any JSON-compatible data (and even some JavaScript data formats beyond strict JSON types) can be converted to an XML representation, have real XPath queries run on it, and the original matching data returned as the results.

We use this to great effect exploring and sifting through data in web browsers, where many different pieces of software may be storing various things globally, but you don't always know where to look.

(The advantage to this approach is that both XML and XPath are specified standards)