Scripting: Docs on Keywords

Jose

What I need:
Documentation on keywords like "params" that can be use in the scripts.

More details:
When writing a script in birt one can use params["someParameter"].value to get the value of that report parameter or imputParams for a data set paramater. Is there a list of all the keywords that can be used? Also, a list of the functions that a keyword might have, e.g., value or text for params.

Note: I am refering to params as a keyword which is probably the wrong way to name it.

Thank you very much for any help.