Subject: Re: [xsl] "--" question From: David Carlisle <davidc@xxxxxxxxx> Date: Mon, 7 Apr 2003 23:06:55 +0100 |
> I am guessing that in SGML a bare "--" can be considered markup. SGML comments can be embedded inside decarations so <!ENTITY nbsp " " -- a non breaking space --> for example. or even <!ENTITY -- a keyword -- nbsp -- a name --" " -- a non breaking space --> The classic one is <!---------!> which is legal SGML comment if there is a multiple of four - as if there are 4n - then this is an empty declaration with n empty comments. Otherwise it's an error as the declaration would be ill formed. XML banned nested comments so you have to have <!ENTITY nbsp " "--><!-- non breaking space --> but banned -- appearing in comments to ensure that every legal XML comment was a legal SGML one, and more generally to ensure every XML document was an (WWW-)SGML one. David XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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