Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/dtdocbook/sgmls/TODO

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+Warn about mixed content models where #PCDATA can't occur everywhere.
+
+Perhaps there should be a configuration option saying what a control
+character is for the purpose of SHUNCHAR CONTROLS.
+
+Should the current character that is printed in error messages be
+taken from be taken from the file entity or the current entity?
+
+Refine SYS_ action.  If we distinguish DELNONCH in lexmark, lexgrp,
+lexsd, we can have separate action that ignores the following
+character as well.
+
+Should RSs in CDATA/SDATA entities be ignored as specified in 322:1-2?
+Similarily, do the rules on REs in 322:3-11 apply to CDATA/SDATA
+entities? (I don't think they count as being `in content'.)
+
+What should the entity manager do when it encounters code 13 in an
+input file? (Currently it treats it as an RE.)
+
+Document when invalid exclusions are detected.
+
+Option not to perform capacity checking.
+
+Give a warning if the recommendation of 422:1-3 is contravened.
+
+Should an empty CDATA/RCDATA marked section be allowed in the document
+type declaration subset?
+
+Include example of use of SGML_PATH in documentation.
+
+Try to detect the situation in 310:8-10 (but see 282:1-2).
+
+Resize hash tables if they become too full.
+
+Say something in the man page about message catalogues.
+
+Consider whether support for SHORTREF NONE requires further changes
+(other than disallowing short reference mapping declaration).
+
+Fake /dev/fd/N and /dev/stdin for systems that don't provide it.
+
+Improve the effficiency of the entity manager by not closing and
+reopening files.  If we run out of FILEs choose the stream with the
+fewest bytes remaining to be read, and read the rest of it into
+memory.  Each entity level will have its own read buffer.
+
+Support multi-line error messages: automatically indent after
+newline.  (We could output to a temporary file first, then copy to
+stderr replacing newlines by newline+indent).
+
+Option that says to output out of context things.
+
+Divide up formal public identifier errors.  Give these errors their
+own type code.
+
+Consider whether, when OMITTAG is NO, we need to change interpretation
+of an empty start-tag (7.4.1.1).
+
+Possibly turn errors 70 and 136 into warnings.
+
+Make things work with NORMSEP > 2.  Would need to keep track of number
+of CDATA and SDATA entities in CDATA attributes.
+
+Handle `SCOPE INSTANCE'.
+
+In entgen.c, truncate filenames for OSs that don't do this themselves.
+
+Provide an option that specifies that maximum number of errors; when
+this limit is exceeded sgmls would exit.
+
+Document non-portable assumptions in the code.
+
+Option to write out SGML declaration.  In this case make it write out
+APPINFO parameter.
+
+Allow there to be catalogs mapping public ids to filenames.
+Environment variable SGML_CATALOG containing list of filenames of
+catalogs.