[ECOS] How to read ecos docs given in sgml-format

[Bob Brusa]

Hi,
the make pdfa4 command that should generate pdfs from sgml when launched 
in ..opt/ecos/doc/sgml/user-guide produces a long list of errors only. 
Here is an excerpt:

jade:introduction.sgml:154:19:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:156:5:E: element "PARA" undefined
jade:introduction.sgml:156:18:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:159:20:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:161:5:E: element "PARA" undefined
jade:introduction.sgml:161:18:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:172:22:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:176:13:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:177:35:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:180:13:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:181:20:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:182:9:E: there is no attribute "LINKEND"
jade:introduction.sgml:182:25:E: element "XREF" undefined
jade:introduction.sgml:184:5:E: element "PARA" undefined
jade:introduction.sgml:185:13:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:191:13:E: element "PRODUCTNAME" undefined
jade:introduction.sgml:193:13:E: element "PRODUCTNAME" undefined

and finally it outputs:

jade -o ecos-user-guide-a4.tex -t tex -V tex-backend  -d 
../../../packages/pkgconf/ssa4.dsl#print user-guide.sgml
../../../packages/pkgconf/rules.doc:143: recipe for target 
'ecos-user-guide-a4.pdf' failed

I could not find an alternative to the above (mean - converting sgml to 
a pdf - sgml in a text editor or browser is ugly). It seems, no 
reasonable reader exists for the sgml format. This lets me wunder why 
the documentation is presented in this now arcane format. Why not 
include these files as open data text (odt) as used by e. g. OpenOffice?

Well, back to the problem: Has anybody a hint why the sgml to pdf fails?
Thanks and best regards,
Robert

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