ONSGMLS

An SGML System Conforming to International Standard ISO 8879 -- Standard Generalized Markup Language

An SGML Extended Facilities system conforming to Annex A of International Standard ISO/IEC 10744 -- Hypermedia/Time-based Structuring Language

SYNOPSIS

onsgmls [ option... ] sysid...

DESCRIPTION

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 amongst 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 nsgmls 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.)

OPTIONS

The following options are available:
-aname, --activate=name
Make link type or doctype name active. Not all ESIS information is output in this case: the active LPDs are not explicitly reported, although each link attribute is qualified with its link type name; there is no information about result elements; when there are multiple link rules applicable to the current element, nsgmls always chooses the first. You cannot mix active link types and doctypes. Only one active doctype can be specified.
-bname, --bctf=name
-bname, --encoding=name
This determines the encoding used for output. If in fixed character set mode it specifies the name of an encoding; if not, it specifies the name of a BCTF.
-B, --batch-mode
Batch mode. Parse each sysid... specified on the command line separately, rather than concatenating them. This is useful mainly with -s.


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.

-csysid, --catalog=sysid
Map public identifiers and entity names to system identifiers using the catalog entry file whose system identifier is sysid. Multiple -c options are allowed. If there is a catalog entry file called catalog in the same place as the document entity, it will be searched for immediately after those specified by -c.
-C, --catalogs
The filename... arguments specify catalog files rather than the document entity. The document entity is specified by the first DOCUMENT entry in the catalog files.
-Ddirectory, --directory=directory
Search directory for files specified in system identifiers. Multiple -D options are allowed. See the description of the osfile storage manager for more information about file searching.
-e, --open-entities
Describe open entities in error messages. Error messages always include the position of the most recently opened external entity.
-Enumber, --max-errors=number
Onsgmls will exit after number errors. If number is 0, there is no limit on the number of errors. The default is 200.
-ffile, --error-file=file
Redirect errors to file. This is useful mainly with shells that do not support redirection of stderr.
-g, --open-elements
Show the generic identifiers of open elements in error messages.
-h, --help
Show a help message and exit.
-iname, --include=name
Pretend that
<!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.
-n, --error-numbers
Show message numbers in error messages.
-ooption, --option=option
Output additional information according to option:
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 subelements.
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.
data-attribute
Output the notation name and attributes for DATA attributes. Otherwise, DATA attributes are treated like CDATA attributes. For more details, see clause 4.4.3 of Annex K of ISO 8879.
comment
Output an _ command with the contents of a comment. Multiple comments in a single comment declaration will result in multiple distinct _ commands, just as if the comments were each in a separate comment declaration.
omitted
Output an o command before a command which was implied by the input document, but omitted from the actual markup. This currently affects (, ), and A commands.
tagomit
As omitted, but only for ( and ) commands.
attromit
As omitted, but only for A commands.
Multiple -o options are allowed.
-p, --only-prolog
Parse only the prolog. Onsgmls will exit after parsing the document type declaration. Implies -s.
-R, --restricted
Restrict file reading. This option is intended for use with onsgmls-based Web tools (e.g., CGI scripts) to prevent reading of arbitrary files on the Web server. With this option enabled, onsgmls will not read any local files unless they are located in a directory (or subdirectory) specified by the -D option or included in the SGML_SEARCH_PATH environment variable. As a further security precaution, this option limits filenames to the characters A-Z, a-z, 0-9, '/', '.', '_', '-' and does not allow filenames containing "..".
-s, --no-output
Suppress output. Error messages will still be printed.
-tfile, --rast-file=file
Output to file the RAST result as defined by ISO/IEC 13673:1995 (actually this isn't quite an IS yet; this implements the Intermediate Editor's Draft of 1994/08/29, with changes to implement ISO/IEC JTC1/SC18/WG8 N1777). The normal output is not produced.
-v, --version
Print the version number.
-wtype, --warning=type
Control warnings and errors. Multiple -w options are allowed. The following values of type enable warnings:
xml
Warn about constructs that are not allowed by XML. The warnings can be enabled individually.
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.
immediate-recursion
Warn about immediately recursive elements. For more details, see clause 2.2.5 of Annex K of ISO 8879.
fully-declared
Warn if the document instance fails to be fully-declared. This has the effect of changing the SGML declaration to specify IMPLYDEF ATTLIST NO ELEMENT NO ENTITY NO NOTATION NO. For more details, see clause 2.2.1 of Annex K of ISO 8879.
fully-tagged
Warn if the document instance fails to be fully-tagged. This has the effect of changing the SGML declaration to specify DATATAG NO, RANK NO, OMITTAG NO, SHORTTAG STARTTAG EMPTY NO and SHORTTAG ATTRIB OMITNAME NO. For more details, see clause 2.2.2 of Annex K of ISO 8879.
amply-tagged, amply-tagged-recursive
Warn if the document instance fails to be amply-tagged. Implicitly defined elements may be immediately recursive if -recursive is specified. This has the effect of changing the SGML declaration to specify DATATAG NO, RANK NO, OMITTAG NO, SHORTTAG ATTRIB OMITNAME NO and either IMPLYDEF ELEMENT ANYOTHER or IMPLYDEF ELEMENT YES. For more details, see clause 2.2.4 of Annex K of ISO 8879.
type-valid
Warn if the document instance fails to be type-valid. This has the effect of changing the SGML declaration to specify VALIDITY YES. For more details, see clause 2.2.3 of Annex K of ISO 8879.
entity-ref
Warn about references to non-predefined entities. This has the effect of changing the SGML declaration to specify ENTITIES REF NONE. For more details, see clause 2.3.2 of Annex K of ISO 8879.
external-entity-ref
Warn about references to external entities. This includes references to an external DTD subset. This has the effect of changing the SGML declaration to specify ENTITIES REF INTERNAL. For more details, see clause 2.3.3 of Annex K of ISO 8879.
integral
Warn if the document instance is not integrally stored. i This has the effect of changing the SGML declaration to specify ENTITIES INTEGRAL YES. For more details, see clause 2.3.1 of Annex K of ISO 8879.
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 ENTITY YES NOTATION YES. An option of -wvalid has the effect of changing the SGML declaration to specify VALIDITY TYPE and IMPLYDEF ATTLIST NO ELEMENT NO ENTITY NO NOTATION NO. If neither -wvalid nor -wno-valid are specified, then the VALIDITY and IMPLYDEF specified in the SGML declaration will be used.
no-afdr
Do not give errors when AFDR meta-DTD notation features are used in the DTD. These errors are normally produced when parsing the DTD, but suppressed when parsing meta-DTDs.
-x, --references
Show information about relevant clauses (from ISO 8879:1986) in error messages.
The following options are also supported for backwards compatibility with sgmls:
-d
Same as -wduplicate.
-l
Same as -oline.
-msysid
Same as -c.
-r
Same as -wdefault.
-u
Same as -wundef.