SGML HELP!!!!! PLEASE?????

[J Horacio MG <homega@vlc.servicom.es>]

My apologies, I know I shouldn't try to call the attention with caps
etc., but I've tried this question a couple of times and seem to get no
response so far:

{I'm writing some docs on SGML, but I'm having some trouble when
converting them with sgml-tools, and I too am a bit confused with it, is
there any mailing list on the subject (ie. SGML)?

Also, what's the difference between Debiandoc-SGML, Linuxdoc-SGML and
Docbook?}

An example of the sgml doc (linuxdoc) and the errors log is attached to
this mail.  Also, if I try with a debiandoc (eg. the file
/usr/doc/debiandoc-sgml/debiandoc-sgml.sgml, the error log reads:

h0rus:/tmp$ sgml2html debiandoc-sgml.sgml
Processing file debiandoc-sgml.sgml
parse_data: no entity map for `©'
parse_data: no entity map for `<'
parse_data: no entity map for `>'
parse_data: no entity map for `&'
/usr/bin/sgmlsasp: can't open
`/usr/lib/sgml-tools/dist/debiandoc/html/mapping':
No existe el fichero o el directorio

(the last line reads: the file or directory doesn't exist)
and the output is an html file with just this inside:

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        Next Previous Contents

Can anyone help me or point me to the right list, please?
-- 
Horacio
homega@vlc.servicom.es
Valencia - ESPAÑA