utput the type(s) it requested.


 <p>Additionally, a transform can indicate secondary inputs/outputs. These are not handled by
 upstream or downstream transforms, and are not restricted by type handled by transform. They can
 be anything.

 <p>It's up to each transform to manage where these files are, and to make sure that these files
 are generated before the transform is called. This is done through additional parameters
 when register the transform.

 <p>These secondary inputs/outputs allow a transform 