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<!--
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* metacatload.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: metacatload.html 878 2001-12-18 18:11:42Z 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">Document Loading</p></td>
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<td class="tablehead" colspan="2" align="right">
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<a href="./metacatdom.html">Back</a> | <a href="./metacattour.html">Home</a> |
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<a href="./metacatquery.html">Next</a>
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</td>
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</tr>
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</table>
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<P>Metacat Server provides functionality for inserting, updating, and deleting
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XML documents in the database. Inserted or updated documents are read, checked
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for validity, decomposed into nodes and inserted into the db. Document validity
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is checked if a valid DTD is provided.
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<P> <img alt="architecture diagram of write action" src="metadatawrite.gif">
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<P> <b>Operations</b>
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<ul>
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<li>INSERT - A new XML document is inserted into the DB with given unique
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docid. The client must specify the docid.</li>
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<li>UPDATE - A document is provided to update a document that already
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has a valid docid. The original document is archived, then overwritten.</li>
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<li>DELETE - Document is archived, and pointer in xml_documents is moved
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to xml_revisions, efectively deleting the document from public view but
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preserving the revision for the revision history.</li>
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</ul>
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<p>Insertions, updates and deletes are passed to Metacat as servlet parameters.
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The following is an example of a web form that can perform these tasks.</p>
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<pre>
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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="metacat/style/rowcol.css">
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</head>
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<body class="emlbody">
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<b>MetaCat XML Loader</b>
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<p>
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Upload, Change, or Delete an XML document using this form.
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</p>
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<form action="http://dev.nceas.ucsb.edu/metacat/servlet/metacat" method="POST">
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<strong>1. Choose an action: </strong>
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<input type="radio" name="action" value="insert" checked> Insert
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<input type="radio" name="action" value="update"> Update
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<input type="radio" name="action" value="delete"> Delete
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<input type="submit" value="Process Action">
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<br />
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<strong>2. Provide a Document ID </strong>
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<input type="text" name="docid"> (optional for Insert)
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<input type="checkbox" name="public" value="yes" checked><strong>Public Document</strong>
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<br />
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<strong>3. Provide XML text </strong> (not needed for Delete)
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<textarea name="doctext" cols="65" rows="15"></textarea>
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<strong>4. Provide DTD text for upload </strong> (optional; not needed for Delete)
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<textarea name="dtdtext" cols="65" rows="15"></textarea>
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</form>
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</body>
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</html>
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</pre>
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<p>Once inserted into the database, the document looks like the following:</p>
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<PRE><b>SQL> select * from xml_nodes where docid='NCEAS:1'</b> <br>
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NODEID NODEINDEX NODETYPE NODENAME NODEDATA PARENTNODEID ROOTNODEID DOCID
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------ --------- ---------- --------------- ---------------------- ------------ ---------- -------
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1 DOCUMENT eml-dataset 1 NCEAS:1
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2 1 ELEMENT eml-dataset 1 1 NCEAS:1
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3 1 TEXT 2 1 NCEAS:1
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4 2 ELEMENT meta_file_id 2 1 NCEAS:1
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5 1 TEXT NCEAS:1 4 1 NCEAS:1
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6 3 TEXT 2 1 NCEAS:1
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7 4 ELEMENT dataset_id 2 1 NCEAS:1
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8 1 TEXT Dist.ssd01 7 1 NCEAS:1
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9 5 TEXT 2 1 NCEAS:1
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10 6 ELEMENT title 2 1 NCEAS:1
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11 1 TEXT Insights on community 10 1 NCEAS:1
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dynamics
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12 7 TEXT 2 1 NCEAS:1
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13 8 ELEMENT originator 2 1 NCEAS:1
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14 1 ATTRIBUTE description Names and addresses of 13 1 NCEAS:1
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principal investigator
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</PRE>
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<p>If you follow the parentnodeid pointers you can recontruct this document.
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The <a href="./metacatdb.html">Metacat Database</a> section provides more details
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on the storage of XML documents.</p>
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<br>
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<a href="./metacatdom.html">Back</a> | <a href="./metacattour.html">Home</a> |
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<a href="./metacatquery.html">Next</a>
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</BODY>
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</HTML>
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