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

SYNOPSIS
    onsgmls [-BCdeglprsuv] [-alinktype] [-bbctf] [-csysid...]
     [-Ddirectory] [-Emax_errors] [-ffile]
     [-iname] [-ooutput_option...] [-tfile]
     [-wwarning_type...] [sysid...]

DESCRIPTION
    onsgmls parses and validates the SGML document whose document entity is
    specified by the system identifiers [sysid...] and prints on the stan-
    dard output a simple text representation of its Element Structure
    Information Set. (This  is the information set which a structure-con-
    trolled 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, pro-
    log 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 iden-
    tifier, <OSFD>0 is used to refer to standard input.)

    The following options are available:

    -alinktype
    Make link type linktype active. Not all ESIS information is out-
    put 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, ons-
    gmls always chooses the first.

    -bbctf, -bencoding
    This determines the encoding used for output. If in fixed char-
    acter set mode it specifies the name of an encoding; if not, it
    specifies the name of a BCTF.

    -B   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
    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   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
    Search directory for files specified in system identifiers. Mul-
    tiple -D options are allowed. See the description of the osfile
    storage manager for more information about file searching.

    -e   Describe open entities in error messages. Error messages always
    include the position of  the most recently opened external
    entity.

    -Emax_errors
    onsgmls will exit after max_errors errors. If max_errors is 0,
    there is no limit on the number of errors. The default is 200.

    -ffile Redirect errors to file. This is useful mainly with shells that
    do not support redirection of stderr.

    -g   Show the generic identifiers of open elements in error messages.

    -iname 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 decla-
    ration. 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  docu-
    ment 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.

    -ooutput_option
    Output additional information according to output_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 file-
    name.

    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.

    -p   Parse only the prolog. onsgmls will exit after parsing the docu-
    ment type declaration. Implies -s.

    -s   Suppress output. Error messages will still be printed.

    -tfile Output to file the RAST result as defined by ISO/IEC 13673:1995
    (actually this isn't quite an IS yet; this implements the Inter-
    mediate Editor's Draft of 1994/08/29, with changes to implement
    ISO/IEC JTC1/SC18/WG8 N1777). The normal output is not produced.

    -v   Print the version number.

    -wtype 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.

    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 identi-
    fier 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 con-
    junction 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 spec-
    ify 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:

    -d   Same as -wduplicate.

    -l   Same as -oline.

    -msysid
    Same as -c.

    -r   Same as -wdefault.

    -u   Same as -wundef.

AUTHORS
    James Clark, Ian Castle <ian.castle@looksystems.co.uk>.