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57 lines
1.9 KiB
57 lines
1.9 KiB
% sgmlcmpt.sty
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%
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% (c) Copyleft 1999 J"org Knappen
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% Licence: GNU licence version 2
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% Documentation: See after \endinput
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\NeedsTeXFormat{LaTeX2e}
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\ProvidesPackage{sgmlcmpt}[1999/06/01]
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\newcommand*\amp{\&}
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\newcommand*\lt{<}
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\newcommand*\gt{>}
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\newcommand*\clmn{&}
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\endinput
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Unfortunately, one cannot embed LaTeX formulae into SGML as #PCDATA. The
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reason is, that a LaTeX formula can contain the characters "<" and "&" which
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have a special meaning in SGML.
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This little package defines four control sequences to circumvent the
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restriction:
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\lt < (less than)
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\gt > (greater than)
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\amp \& (ampersand sign)
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\clmn & (column separator)
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\gt is only provided for aesthetical reasons; the asymmetry between \lt
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and > looks ugly to the author of this package.
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The usual catcodes for >, <, and & are assumed while the package is read in.
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The following little sed script will make all your TeX formulae SGML #PCDATA
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s/</\\lt /g
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s/>/\\gt /g
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s/\\&/{\\amp}/g
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s/&/\\clmn /g
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Fine print
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Note the spaces inserted after \lt,\gt, and \clmn: They guarantee that the
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control words are ended properly. There shouldn't be any spaces eaten up, since
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">" and "<" are not intended to be input in text (horizontal) mode. With
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standard TeX fonts they produce surprising results anyway. Leading spaces after
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a column separator are ignored by TeX, so no problem here.
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Turning the control symbol \& into a control word \amp may cause the loss of
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significant spaces, therefore the additional group here. The group should
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cause no harm, since \& is alreday of math type "other". It may suppress
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a hypothetical ligature or kern between the ampersand sign and a following
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character in text mode depending on how many passes TeX needs in order to
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typeset the paragraph. The standard TeX fonts don't contain such ligatures
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or kerns.
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J"org Knappen, Barbarossaring 43, D-55118 Mainz, Allemagne
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Author of the Book: Schnell ans Ziel mit LaTeX2e, Oldenbourg-Verlag
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M"unchen, 1997, ISBN 3-486-24199-0.
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% /sgmlcmpt.sty
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