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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: '$Id$'
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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="./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="./metacatgetlog.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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    &lt;?xml version="1.0"?&gt;
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    &lt;style-set name="knb"&gt;
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      &lt;default-style&gt;http://http://server.domain.com/metacat/style/ascii-treeview.xsl&lt;/default-style&gt;
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      &lt;doctype publicid="-//NCEAS//resultset//EN"&gt;
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        &lt;target publicid="-//W3C//HTML//EN"&gt;http://http://server.domain.com/metacat/style/resultset.xsl&lt;/target&gt;
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      &lt;/doctype&gt;
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      &lt;doctype publicid="-//NCEAS//login//EN"&gt;
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        &lt;target publicid="-//W3C//HTML//EN"&gt;http://http://server.domain.com/metacat/style/login.xsl&lt;/target&gt;
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      &lt;/doctype&gt;
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      &lt;doctype publicid="-//NCEAS//eml-dataset-2.0//EN"&gt;
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        &lt;target publicid="-//W3C//HTML//EN"&gt;http://http://server.domain.com/metacat/style/eml-dataset-display.xsl&lt;/target&gt;
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      &lt;/doctype&gt;
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      &lt;doctype publicid="-//NCEAS//eml-dataset//EN"&gt;
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        &lt;target publicid="-//W3C//HTML//EN"&gt;http://http://server.domain.com/metacat/style/eml-dataset-display.xsl&lt;/target&gt;
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      &lt;/doctype&gt;
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      &lt;doctype publicid="-//NCEAS//eml-resource//EN"&gt;
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        &lt;target publicid="-//W3C//HTML//EN"&gt;http://http://server.domain.com/metacat/style/eml-dataset-display.xsl&lt;/target&gt;
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      &lt;/doctype&gt;
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      &lt;doctype publicid="-//ecoinformatics.org//eml-dataset-2.0.0beta4//EN"&gt;
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        &lt;target publicid="-//W3C//HTML//EN"&gt;http://http://server.domain.com/metacat/style/eml-dataset-display.xsl&lt;/target&gt;
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      &lt;/doctype&gt;
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    &lt;/style-set&gt;
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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 &lt;style-set&gt; name parameter.


      

      

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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="./metacatgetlog.html">Next</a>


      

      

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</BODY>


      

      

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</HTML>