How to create a table from tree-like entity construct

[mirko27]

I`m creating example for Seam and ran into a problem.
I have Category and each Category has a head-category.
So Every Category has getLowers(); which gives categories
whose head category is.
How can I output all Categories?

[gavin.king]

huh?

[syberchic]

*grin* phrasing questions is an art.

They want to get all objects with (infinite levels of) children. This appears to be a generic question, I don't see how it's seam specific.