binary base64 definition

[Jerry Johns <Jjohns@computerlogic.com>]

In the DTD, can I specify a type of "binary base64" for an element so that
when I write to the XML file using DOM, DOM will automatically encode the
binary data for me without parsing for control characters? If so, I assume
it will do the reverse when I read that element.

Can anyone validate my assumption about the DTD data type? Has anyone seen
an example DTD definition with this in it?

Thanks much.
Jerry