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<!DOCTYPE HTML PUBLIC "html.dtd"><HTML><HEAD><TITLE>Presenting XML:Introducing XML:EarthWeb Inc.-</TITLE><META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW"><SCRIPT><!--function displayWindow(url, width, height) { var Win = window.open(url,"displayWindow",'width=' + width +',height=' + height + ',resizable=1,scrollbars=yes');}//--></SCRIPT></HEAD><BODY BGCOLOR="#FFFFFF" VLINK="#DD0000" TEXT="#000000" LINK="#DD0000" ALINK="#FF0000"><TD WIDTH="540" VALIGN="TOP"><!-- <CENTER><TABLE><TR><TD><FORM METHOD="GET" ACTION="http://search.itknowledge.com/excite/cgi-bin/AT-foldocsearch.cgi"><INPUT NAME="search" SIZE="20" VALUE=""><BR><CENTER><INPUT NAME="searchButton" TYPE="submit" VALUE="Glossary Search"></CENTER><INPUT NAME="source" TYPE="hidden" VALUE="local" CHECKED> <INPUT NAME="bltext" TYPE="hidden" VALUE="Back to Search"><INPUT NAME="sp" TYPE="hidden" VALUE="sp"></FORM></TD><TD><IMG SRC="http://www.itknowledge.com/images/dotclear.gif" WIDTH="15" HEIGHT="1"></TD><TD><FORM METHOD="POST" ACTION="http://search.itknowledge.com/excite/cgi-bin/AT-subscriptionsearch.cgi"><INPUT NAME="search" SIZE="20" VALUE=""><BR><CENTER><INPUT NAME="searchButton" TYPE="submit" VALUE=" Book Search "></CENTER><INPUT NAME="source" TYPE="hidden" VALUE="local" CHECKED> <INPUT NAME="backlink" TYPE="hidden" VALUE="http://search.itknowledge.com:80/excite/AT-subscriptionquery.html"><INPUT NAME="bltext" TYPE="hidden" VALUE="Back to Search"><INPUT NAME="sp" TYPE="hidden" VALUE="sp"></FORM></TD></TR></TABLE></CENTER> --><!-- ISBN=1575213346 //--><!-- TITLE=Presenting XML//--><!-- AUTHOR=Richard Light//--><!-- PUBLISHER=Macmillan Computer Publishing//--><!-- IMPRINT=Sams//--><!-- CHAPTER=01 //--><!-- PAGES=0001-0018 //--><!-- UNASSIGNED1 //--><!-- UNASSIGNED2 //--><P><CENTER><A HREF="0014-0017.html">Previous</A> | <A HREF="../ewtoc.html">Table of Contents</A> | <A HREF="../ch02/0019-0022.html">Next</A></CENTER></P><A NAME="PAGENUM-18"><P>Page 18</P></A><P>Also, because the client receives only HTML, she is unable to do morethan browse it. The original database records might contain structuredinformation that could be usefully processed on the client's machine, but the conversionto HTML loses this structure.</P><TABLE BGCOLOR="#FFFF99"><TR><TD>Note:</TD></TR><TR><TD><BLOCKQUOTE>The W3C's Document Object Model (DOM) initiative will,when implemented, allow more efficient interaction between clients andservers, including the remote editing of HTML documents. However, there isnothing in the requirements draft for DOM that suggests that it will apply todata formats other than HTML, XML, and CSS (Cascading Style Sheets).</BLOCKQUOTE></TD></TR></TABLE><P>Finally, it is worth pointing out that HTML pages are not really pullingtheir weight in relation to search and retrieval. The approach adopted by mostWeb search engines is to ignore the markup and simply treat each page asunstructured free text. The result is that most Web searches generate a very largenumber of hits, most of them irrelevant to the original inquiry. The only wayaround this has been to use classical indexing methods by embedding metadatainto the Web pages themselves or by setting up parallel resource discoverysystems.</P><H3><A NAME="ch01_ 22">Summary</A></H3><P>In this chapter, you learned about markup and generalized markup. Youthen made a whistle-stop tour through the main highlights of StandardGeneralized Markup Language (SGML), which is a classic generalized markup scheme.</P><P>Next, you turned your attention to the current markup language of theWeb, HTML, and looked at it in a new light—as an SGML application.Finally, you saw some areas in which HTML appears to be struggling to meet thedemands that the Web is placing on it.</P><P>Armed with this background, you can now go on to meet a new markuplanguage—XML.</P><P><CENTER><A HREF="0014-0017.html">Previous</A> | <A HREF="../ewtoc.html">Table of Contents</A> | <A HREF="../ch02/0019-0022.html">Next</A></CENTER></P></TD></TR></TABLE></BODY></HTML>⌨️ 快捷键说明
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