XML/HTML DOM in Ada

["Peter Hend�n" <phenden@tdab.com>]

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I have been thinking about implementing the DOM in Ada. The
with'ing problem makes separating the type definitions difficult.
Of course one could make everything a Node (as is indeed
allowed according to the DOM rec.), but this makes information
and implementation hiding just as "jumbled" as declaring all
node types in one package.

My current method is that I make all node types (derived from
base type Node (is new Controlled with private)) have primitive
operations that take an in out DerivedFromNode, and use
Volan's generic package Forward (described in
http://home.bluemarble.net/~jvolan/WithingProblem/FAQ.html)
to construct forwarding references to other Node types.

While this solution is straight forward:-) and relatively easy to
implement, I don't really like the fact that the user needs to
know about two access types for each node type as well as
nowing to use the conversion operator (+) at the proper times.

Has anyone else given this any thought? Am I over the top here?
Is there a better way?

Regards,
Peter
--
Peter Hend�n           http://www.algonet.se/~phenden
ICQ: 14672398
Teknisk Dokumentation AB          http://www.tdab.com