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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML Strict//EN"><HTML><HEAD><TITLE>SP - XML support</TITLE></HEAD><BODY><H1>XML support</H1><H2>Using SP to parse XML</H2><P>To enable SP's support for <AHREF="http://www.w3.org/TR/1998/REC-xml-19980210">XML 1.0</A>:<UL><LI>Set the <SAMP>SP_CHARSET_FIXED</SAMP> environment variable to <SAMP>YES</SAMP>.<LI>Set the <SAMP>SP_ENCODING</SAMP> environment variable to <SAMP>XML</SAMP>.<LI>Set the <SAMP>SGML_CATALOG_FILES</SAMP> environment variable topoint to the file <SAMP>pubtext/xml.soc</SAMP>.<LI>Use the <SAMP>-wxml</SAMP> option.<LI>If the document is not supposed to be valid, use <SAMP>-wno-valid</SAMP>option.</UL><H2>Limitations</H2><P>SP does not enforce the following XML constraints:<UL><LI>XML constrains processing instructionswith a target matching <CODE>[Xx][Mm][Ll]</CODE>,both in terms of where they can occur and their content.<LI>XML does not allow a parameter separator that is adjacent to adelimiter to be omitted.<LI>XML has constraints on the use of <CODE>&</CODE> in parameterliterals. In SGML terms, XML says that the <b>ero</b> delimiter isrecognized in a parameter literal, and that it must be followed by anentity reference, but the entity reference is not expanded.</UL><P>Line ends are normalized using SGML conventions to a CR/LF characterpair rather than using the XML convention of a single LF character.<P>There is no support for characters outside the basic multilingual plane(ie those with scalar values greater than U+FFFF).<P>SP does not enforce XML's rules on not continuing normal processingafter an error. Applications can enforce these if they choose.<H2>Web SGML Adaptations Annex</H2><P>SP's support for SGML is based on <AHREF="http://www.ornl.gov/sgml/wg8/document/1955.htm">Annex K of ISO8879</A> (the Web SGML Adaptations Annex).The following features of Annex K are not yet implemented:<UL><LI>Checking of <SAMP>ENTITIES REF</SAMP> assertions<LI><SAMP>#IMPLIED</SAMP> document type name<LI>Implying definitions of notations and entities(<CODE>IMPLYDEF ENTITY YES</CODE> and <CODE>NOTATION YES</CODE>)<LI>SGML declarations on subdocuments<LI><SAMP>DATA</SAMP> declared value<LI>URN feature</UL><P><ADDRESS>James Clark<BR>jjc@jclark.com</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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