How can I use TopLink for querys that have two and more tables?

I use TopLink today, and I can use one table to query, but how can I use TopLink for querys that have two and more tables?
Thank you for see and answer this question.

You can write a custom SQL query and map it to an object as needed. You can also use the Toplink query language "anyOf" or "get" commands to map two tables as long as you map them as one to one (get command) or one to many (anyOf command) in the toplink mapping workbench.
Zev.
check out oracle.toplink.expressions.Expression in the 10.1.3 API

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