Indicates what sort of output is being generated by this template.

Possible values:

"document"
the template generates a separate document file
"included"
the template was called from a different template to generate a piece of the document being generated by the caller
"frameset"
the template generates an HTML frameset file (e.g. index.html)
"none"
the template generates no output
Note:
Additionally, the template may call other templates to do something else (e.g. to generate all documents loaded in the frames).