java - What is the difference between queryvalue() and querynode()? -


when wrote line: 

this.atputifnotnil("qwerttty", profile.queryvalue("qwertty"), profile);

it throwing compile time error.
when changed querynode(), got rectified.

this.atputifnotnil("qwerttty", profile.querynode("qwertty"), profile);

i want know difference between two.


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