142 lines
7.4 KiB
HTML
142 lines
7.4 KiB
HTML
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<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>What's new in SP?</title>
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</head>
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<body>
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<h1>
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What's new?</h1>
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This document describes user-visible changes in SP up to 1.3. Bug fixes are
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not described.
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<h2>
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Version 1.3</h2>
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Better <a href="xml.htm">support for XML</a> based on the Web SGML Adaptations
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Annex to ISO 8879.
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<p>New <a href="sx.htm">SX</a> application that converts SGML to XML.
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<p>The architecture engine has been updated to match HyTime 2nd Edition
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(This means that you must use
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<tt><?IS10744 ArcBase <i>arch</i>></tt>
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rather than
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<tt><?ArcBase <i>arch</i>></tt>.)
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<h2>
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Version 1.2</h2>
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The Extended Naming Rules TC is supported. The extensions supported in
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external concrete syntaxes have been changed for compatibility with this.
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<p>The handling of character sets in the multi-byte version is more sophisticated.
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The <a href="charset.htm">character sets</a> HTML page gives more information.
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<p>SP has built-in knowledge of many <a href="sgmldecl.htm#charset">more
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base character sets</a>.
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<p>nsgmls will report empty elements if the <tt>-oempty</tt> option is
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used.
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<p>DTD-less parsing is possible, by using the <tt>-wno-valid</tt> option
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to allow undefined elements and attributes. This allows parsing of well-formed
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XML documents, whether or not valid.
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<h2>
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Version 1.1</h2>
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There is now generalized support for <a href="archform.htm">architectural
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form processing</a>.
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<p>Documentation is now in HTML format.
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<p>A BASE catalog entry can be used to specify a base system identifier
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for resolving relative storage object identifiers occurring in the catalog.
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<p>A LITERAL storage manager is now provided.
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<p>Programs have a -E option that sets the maximum number of errors.
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<p>A DELEGATE catalog entry allows distributed resolution of public identifiers.
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<p>nsgmls has a -B (batch mode) option that allows you to parse multiple
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documents with a single invocation of nsgmls.
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<p>In nsgmls the -c option now specifies a catalog as it does in spam and
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sgmlnorm, in addition to the -m option that previously did this.
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<p>The <tt>-n</tt> option has been replaced by a
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<tt>-onotation-sysid</tt>
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which applies to nsgmls only, and a
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<tt>-wnotation-sysid</tt> which applies
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generally.
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<p>SP can be built as a DLL under Win32.
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<h2>
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Version 1.0</h2>
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The syntax of system identifiers has completely changed. The new syntax
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is based on the syntax of formal system identifiers defined in ISO/IEC
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10744 (HyTime) Technical Corrigendum 1, Annex D.
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<p>The NSGMLS_CODE environment variable has been renamed to SP_BCTF. nsgmls
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has a -b option to specify the bit combination transformation format to
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be used for output.
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<p>A list of directories in which files specified in system identifiers
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should be searched for can be specified using the environment variable
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SGML_SEARCH_PATH or the option -D.
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<p>Individual SYSTEM identifiers in external identifiers can be overridden
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using SYSTEM entries in the catalog.
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<p>The OVERRIDE catalog entry now takes a YES/NO argument. (This change
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was required for conformance to the SGML Open TR.) It applies to each entry
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individually rather than to the entire catalog.
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<p>The -w options of nsgmls and spam have been enhanced. In spam, the -w
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option takes an argument as with nsgmls. There are new warnings for minimized
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start and end tags (-wunclosed, -wempty, -wnet and -wmin-tag); for unused
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short reference maps (-wunused-maps); for unused parameter entities (-wunused-param).
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-wall now doesn't include those warnings that are about conditions that,
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in the opinion of the author, there is no reason to avoid. A warning can
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be turned off by using its name prefixed by no-; thus -wmin-tag -wno-net
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is equivalent to -wunclosed -wempty. The -w option is also used to turn
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off errors: -wno-idref replaces the -x option; -wno-significant replaces
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the -X option.
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<p>In the output of nsgmls, characters that cannot be represented in the
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encoding translation specified by the NSGMLS_BCTF environment variable
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are represented using an escape sequence of the form \#N; when N is a decimal
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integer.
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<p>In the multi-byte versions of nsgmls there are new BCTFs is8859-N for
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N = 1,...,9.
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<p>There is a -o option to nsgmls which makes it output additional information:
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-oentity outputs information about all entities; -oid distinguish attributes
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with a declared value of id; -oincluded distinguishes included subelements.
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<p>nsgmls now automatically searches for a catalog entry file called "catalog"
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in the same place as the document entity. Note that when the document entity
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is specified with a URL, this matches the behaviour of Panorama.
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<p>A catalog entry file can contain CATALOG entries specifying additional
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catalog entry files. This matches the behaviour of Panorama.
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<p>The parser can now make available to an application complete information
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about the markup of prologs and SGML declarations. It would now be possible,
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for example, to use SP to write a DTD editor. spam exploits this to a limited
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extent: if the -p option is specified twice, then parameter entity references
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between declarations will be expanded; the -mreserved option puts all reserved
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names in upper-case; with the -mshortref option short reference use declarations
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and short reference mapping declarations will be removed; attribute specification
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lists in data attribute specifications in entity declarations can be normalized
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like attribute specification lists in start-tags; with -mms it resolves
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IGNORE/INCLUDE marked sections.
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<p>nsgmls has a -C option which causes the command line filenames to be
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treated as a catalog whose DOCUMENT entry specifies the document entity.
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<p>nsgmls has a -n option which causes it to generate system identifiers
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for notations in the same way as it does for entities.
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<p>spam now has a -f option like nsgmls.
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<p>The interface between the parser and entity manager has been redesigned
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so that the entity manager can be used independently of the parser. This
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is exploited by a new program called spent that prints an entity with a
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specified system identifier on the standard output.
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<p>In most cases, a Control-Z occurring as the last byte in a file will
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be stripped. This is controlled by the zapeof attribute in formal system
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identifiers.
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<h2>
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Version 0.4</h2>
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External concrete syntaxes, character sets and capacity sets are supported
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using PUBLIC entries in catalog files. The multicode code core and reference
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syntaxes are no longer built-in. Only a few character sets are now built-in.
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<p>Within external concrete syntaxes, various useful extensions are permitted.
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In particular, an ellipsis syntax is allowed for the specification of name
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characters and single character short references. It is now practical to
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specify tens of thousands of additional name characters.
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<p>The default SGML declaration is more permissive.
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<p>nsgmls has a -x option that inhibits checking of idrefs.
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<p>nsgmls has a -w option that can enable additional warnings. In particular,
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-wmixed will warn about mixed content models that do not allow #pcdata
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everywhere.
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<p>The meaning of the f command in the output of nsgmls has changed slightly.
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It now gives the effective system identifier of the entity.
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<p>The functionality of the rast program has been merged into the nsgmls
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program and the rast program has been removed. The -t option makes nsgmls
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generate a RAST result.
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<p>spam has a -l option that uses lower-case for added names that were
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subject to upper-case substitution.
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<p>spam has a -mcurrent option that adds omitted attribute specifications
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for current attributes.
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</body>
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</html>
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