[xml] Listing possible valid attributes

[D Haley <mycae yahoo com>]

Hello,

I have been hunting around the API, but I cannot seem to find any way to obtain a list of attributes as 
specified by the DTD for a given type of node.

I am basically building a simple XML writing "helper" app and I would like to show users what their attribute 
options are. Does anyone know how I might do this, or where I should look?

Thanks.