How to Write A Custom Path / Fileset

[Graham Lea]

I want to write a custom Fileset type that reads input from a file.
I don't want to support any nested elements, I just want to be able to 
do something like this:

   <libraryset id="myLibraries" file="libraries.txt"/>
and have a custom class create a fileset based on the content of 
libraries.txt.

So, I have two questions:
1. Is it possible for me to do this (i.e. define a new DataType and use 
it in a build file)?
[Or do I have to write a custom Task that creates the fileset?]

2. If the answer to 1. is 'Yes', where/what should I be extending?
[Or, if the answer is 'No', what sort of FileSet should my task be 
creating?]
       org.apache.tools.ant.ProjectComponent?
       org.apache.tools.ant.types.DataType?
       org.apache.tools.ant.types.AbstractFileSet?
       org.apache.tools.ant.types.FileSet?

Thanks very much,
Graham.
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