Doxygen, a documentation generator for C, C++, etc., has the useful
feature that it can use a tags file combined with a canonical base URL
to resolve links to documentation for other libraries.  Suppose library
B uses library A; when building documentation for B, Doxygen can use the
tags and URL for A so that references in B to classes, functions, etc.
provided by A are hyperlinked to the canonical location of the
documentation for A.

Is there any support for this kind of functionality floating around for
ocamldoc?  If not, is it something that could be added with a custom
generator without too much difficulty?

Thanks,
- Michael