sgmls: Warning at test008.sgm, line 8 at record start:
       Element "X" used in DTD but not defined
sgmls: SGML error at test008.sgm, line 9 at ">":
       Exclusion cannot apply to token "B" in content model for "CHAP"
       Element structure: GDOC BODY CHAP
sgmls: SGML error at test008.sgm, line 9 at "/":
       Undefined X start-tag GI was used in DTD; "X O O ANY" assumed
       Element structure: GDOC BODY CHAP A
