sgmls: SGML error at test023.sgm, line 5 in declaration parameter 2:
       One or more parameters missing; declaration ignored
sgmls: SGML error at test023.sgm, line 8 in declaration parameter 2:
       MDC delimiter (>) expected; following text may be misinterpreted
       Element structure: DOC
sgmls: SGML error at test023.sgm, line 9 in declaration parameter 2:
       Associated element type not allowed in document instance
       Element structure: DOC
sgmls: SGML error at test023.sgm, line 10 in declaration parameter 2:
       Associated element type not allowed in document instance
       Element structure: DOC
sgmls: SGML error at test023.sgm, line 11 in declaration parameter 1:
       Map does not exist; declaration ignored
       Element structure: DOC
