onsgmls - An SGML System Conforming to International Standard ISO 8879 -- Standard Generalized Markup Language
onsgmls [-BCdeglprsuv] [-alinktype] [-bbctf] [-csysid...] [-Ddirectory] [-Emax_errors] [-ffile] [-iname] [-ooutput_option...] [-tfile] [-wwarning_type...] [sysid...]
onsgmls parses and validates the SGML document whose document entity is specified by the system identifiers [sysid...] and prints on the standard output a simple text representation of its Element Structure Information Set. (This is the information set which a structure-controlled conforming SGML application should act upon.) If more than one system identifier is specified, then the corresponding entities will be concatenated to form the document entity. Thus the document entity may be spread among several files; for example, the SGML declaration, prolog and document instance set could each be in a separate file. If no system identifiers are specified, then onsgmls will read the document entity from the standard input. A command line system identifier of - can be used to refer to the standard input. (Normally in a system identifier, <OSFD>0 is used to refer to standard input.)
The following options are available:
If -tfilename is also specified, then the specified filename will be prefixed to the sysid to make the filename for the RAST result for each sysid.
<!ENTITY % name "INCLUDE">
occurs at the start of the document type declaration subset in the SGML document entity. Since repeated definitions of an entity are ignored, this definition will take precedence over any other definitions of this entity in the document type declaration. Multiple -i options are allowed. If the SGML declaration replaces the reserved name INCLUDE then the new reserved name will be the replacement text of the entity. Typically the document type declaration will contain
<!ENTITY % name "IGNORE">
and will use %name; in the status keyword specification of a marked section declaration. In this case the effect of the option will be to cause the marked section not to be ignored.
entity Output definitions of all general entities not just for data or subdoc entities that are referenced or named in an ENTITY or ENTITIES attribute.
id Distinguish attributes whose declared value is ID.
line Output L commands giving the current line number and filename.
included Output an i command for included sub-elements.
empty Output an e command for elements which are not allowed to have an end-tag, that is those with a declared content of empty or with a content reference attribute.
notation-sysid Output an f command before an N command, if a system identifier could be generated for that notation.
nonsgml In fixed character set mode, output escape sequences for non-SGML data characters. Non-SGML data characters can result from numeric character references.
Multiple -o options are allowed.
xml Warn about constructs that are not allowed by XML.
mixed Warn about mixed content models that do not allow #pcdata anywhere.
sgmldecl Warn about various dubious constructions in the SGML declaration.
should Warn about various recommendations made in ISO 8879 that the document does not comply with. (Recommendations are expressed with ``should'', as distinct from requirements which are usually expressed with ``shall''.)
default Warn about defaulted references.
duplicate Warn about duplicate entity declarations.
undefined Warn about undefined elements: elements used in the DTD but not defined.
unclosed Warn about unclosed start and end-tags.
empty Warn about empty start and end-tags.
net Warn about net-enabling start-tags and null end-tags.
min-tag Warn about minimized start and end-tags. Equivalent to combination of unclosed, empty and net warnings.
unused-map Warn about unused short reference maps: maps that are declared with a short reference mapping declaration but never used in a short reference use declaration in the DTD.
unused-param Warn about parameter entities that are defined but not used in a DTD. Unused internal parameter entities whose text is INCLUDE or IGNORE won't get the warning.
notation-sysid Warn about notations for which no system identifier could be generated.
all Warn about conditions that should usually be avoided (in the opinion of the author). Equivalent to: mixed, should, default, undefined, sgmldecl, unused-map, unused-param, empty and unclosed.
A warning can be disabled by using its name prefixed with no-. Thus -wall -wno-duplicate will enable all warnings except those about duplicate entity declarations.
The following values for warning_type disable errors:
no-idref Do not give an error for an ID reference value which no element has as its ID. The effect will be as if each attribute declared as an ID reference value had been declared as a name.
no-significant Do not give an error when a character that is not a significant character in the reference concrete syntax occurs in a literal in the SGML declaration. This may be useful in conjunction with certain buggy test suites.
no-valid Do not require the document to be type-valid. This has the effect of changing the SGML declaration to specify VALIDITY NOASSERT and IMPLYDEF ATTLIST YES ELEMENT YES. An option of -wvalid has the effect of changing the SGML declaration to specify VALIDITY TYPE and IMPLYDEF ATTLIST NO ELEMENT NO. If neither -wvalid nor -wno-valid are specified, then the VALIDITY and IMPLYDEF specified in the SGML declaration will be used.
The following options are also supported for backward compatibility with sgmls: