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<!--
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* metacatread.html
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*
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* Authors: Jivka Bojilova
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* For Details: http://www.nceas.ucsb.edu/
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* Created: 2000 April 5
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* Version: 0.01
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* File Info: '$Id: metacatread.html 881 2001-12-18 19:50:12Z berkley $'
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*
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* October Meeting SDSC, 2000
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-->
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<HTML>
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<HEAD>
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<TITLE>Metacat</TITLE>
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<link rel="stylesheet" type="text/css" href="@docrooturl@default.css">
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</HEAD>
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<BODY>
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<table width="100%">
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<tr>
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<td class="tablehead" colspan="2"><p class="label">Reading a Document
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from the Database</p></td>
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<td class="tablehead" colspan="2" align="right">
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<a href="./metacatquery.html">Back</a> | <a href="./metacattour.html">Home</a> |
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<a href="./saxparser.html">Next</a>
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</td>
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</tr>
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</table>
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<p>Metacat allows clients to read a document in several different ways,
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depending on how the client wants the document returned and how the client
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wants to specify the requested document. </p>
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<P> <img alt="architecture diagram of the Metacat read process"
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src="metadataread.gif"> </p>
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<p>The documents are requested by the <b>docid</b> servlet parameter by specifying
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the document id that you wish to read.<br>
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</p>
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<p>
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Metacat allows the dynamic transformation of read documents through the use
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of style-sets. A style-set is an xsl stylesheet or a group of stylesheets
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that are specified in a config file. The following is an example of a style-set
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config file:
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</p>
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<pre>
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<?xml version="1.0"?>
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<style-set name="knb">
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<default-style>http://http://server.domain.com/metacat/style/ascii-treeview.xsl</default-style>
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<doctype publicid="-//NCEAS//resultset//EN">
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<target publicid="-//W3C//HTML//EN">http://http://server.domain.com/metacat/style/resultset.xsl</target>
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</doctype>
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<doctype publicid="-//NCEAS//login//EN">
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<target publicid="-//W3C//HTML//EN">http://http://server.domain.com/metacat/style/login.xsl</target>
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</doctype>
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<doctype publicid="-//NCEAS//eml-dataset-2.0//EN">
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<target publicid="-//W3C//HTML//EN">http://http://server.domain.com/metacat/style/eml-dataset-display.xsl</target>
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</doctype>
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<doctype publicid="-//NCEAS//eml-dataset//EN">
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<target publicid="-//W3C//HTML//EN">http://http://server.domain.com/metacat/style/eml-dataset-display.xsl</target>
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</doctype>
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<doctype publicid="-//NCEAS//eml-resource//EN">
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<target publicid="-//W3C//HTML//EN">http://http://server.domain.com/metacat/style/eml-dataset-display.xsl</target>
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</doctype>
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<doctype publicid="-//ecoinformatics.org//eml-dataset-2.0.0beta4//EN">
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<target publicid="-//W3C//HTML//EN">http://http://server.domain.com/metacat/style/eml-dataset-display.xsl</target>
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</doctype>
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</style-set>
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</pre>
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<p>
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Whenever a read action is requested from Metacat, you can also provide a qformat parameter.
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This qformat parameter should be the name of the style-set that you wish to use
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to transform the document you are requesting. Note that the value that you set
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qformat to must equal the <style-set> name parameter.
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</p>
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<p>
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A default style-set can be set in the metacat.properties file. If qformat
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is set to 'html', Metacat will use the default. If qformat is set to 'xml',
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Metacat will return the XML document untransformed.
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</p>
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<br>
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<a href="./metacatquery.html">Back</a> | <a href="./metacattour.html">Home</a> |
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<a href="./saxparser.html">Next</a>
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</BODY>
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</HTML>
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