How to lookup what datatype JSF tag component requires?

Kinda beginner question following on my part and not sure I'm asking this in the correct web-page speak?
I just happen to know if I have a tag such as <af:tree>, I know its value attribute requires an instance of oracle.adf.view.faces.model.TreeModel at runtime.
However how do I determine specifically the datatype that the tag-attribute requires at design time? For the majority of tags in JSF/ADF Faces this will be strings, but for tricky tags like <af:tree> how can I work this out?
The tag doco doesn't mention this. Do I need to go to the tag libraries? How would I do this in JDeveloper? Does JDeveloper provide any other help on looking this up?
Any help appreciated.
Regards,
CM.

The tagdoc for tree at
http://www.oracle.com/technology/products/jdev/htdocs/partners/addins/exchange/jsf/doc/tagdoc/core/tree.html
says about the value attribute:
"the hierarchy of tree data - must be of type oracle.adf.view.faces.model.TreeModel"
As to how I found that? Google. I find ADF documentation very hard to find any other way and often end up googling things like:
adf af:tree value site:oracle.com
Not exactly what you were looking for, I know, but hope it is of some help.

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