how many build.xml files and where should they go?

[Tim Singletary <ts...@vetinsite.com>]

I haven't seen much discussion about this question, but there seem to
be two very different approaches to managing build.xml files.

One approach has a single build.xml at the top of the project tree.

The other approach has many build.xml files, one in each subdirectory
in the src tree.

Why should I choose one approach over the other?  Is either approach
generally preferred?

tim