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<!--
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* xmlindex.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: xmlindex.html 3780 2008-04-02 23:28:31Z daigle $'
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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">Indexing for Performance</p></td>
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<td class="tablehead" colspan="2" align="right">
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<a href="./saxparser.html">Back</a> | <a href="./metacattour.html">Home</a> |
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<a href="./acontrol.html">Next</a>
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</td>
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</tr>
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</table>
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<P>Metacat DB stores indeces for the current version of all documents in <i>xml_index</i>
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table. All relative and absolute paths to any node in a document are stored in
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this table. These paths are used for structured query searches to a specified
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location in an XML tree. Path expressions specified in the
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<a href="./metacatquery.html">pathquery</a> document are queried from this
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table.</p>
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<p>Indeces become necessary because relational databases are not efficient
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at querying tree structures. By slightly denormalizing the database and listing
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the tree structure in a flat table, the relational database engine can more
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effectively handle large path queries.</p>
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<p>Example: </p>
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<pre>
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<?xml version="1.0"?>
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<!DOCTYPE employee>
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<employee>
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<name>
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<first>Chad</first>
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<last>Berkley</last>
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</name>
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<address>
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<street>735 State St. Ste. 303</street>
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<city>Santa Barbara</city>
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<state>California</state>
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<zip>93101</zip>
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</address>
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<occupation>
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<title>Metadata Systems Developer</title>
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<location>
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<type>
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<grant>
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<name>DBA</name>
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<grantor>NSF</grantor>
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<PI>Jim Reichman</PI>
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<PI>Matt Jones</PI>
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<PI>Mark Schildhauer</PI>
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</grant>
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</type>
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<system>UC</system>
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<location>Santa Barbara</location>
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</location>
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</occupation>
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</employee>
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</pre>
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<p>The XML document above is logically deconstructed into all possible paths
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through the document. Each path (relative and absolute) is entered as a record
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in xml_index along with the nodeid of the deepest node. In this way, any path
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can be quickly queried. It's contents can be assertained from cross linking
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the nodeid back to the <a href="#xml_nodes">xml_nodes</a> table.
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<table border="1">
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<tr>
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<td><b>PATH</b></td><td><b>NODEID</b></td><td><b>PARENTNODEID</b></td>
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</tr>
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<tr><td>occupation/location/type/grant/grantor</td><td>200150</td><td>200145<td></tr>
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<tr><td>location/type/grant/grantor</td><td>200150</td><td>200145<td></tr>
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<tr><td>grantor</td><td>200150</td><td>200145<td></tr>
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<tr><td>location/type/grant/PI</td><td>200153</td><td>200145<td></tr>
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<tr><td>grant/PI</td><td>200153</td><td> 200145<td></tr>
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<tr><td>/employee/occupation/location/type/grant/PI</td><td>200153</td><td> 200145<td></tr>
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<tr><td>employee/occupation/location/type/grant/PI</td><td>200153</td><td> 200145<td></tr>
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<tr><td>occupation/location/type/grant/PI</td><td>200153</td><td> 200145<td></tr>
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<tr><td>type/grant/PI</td><td>200153</td><td> 200145<td></tr>
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<tr><td>PI</td><td>200153</td><td> 200145<td></tr>
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<tr><td>location/type/grant/PI</td><td>200156</td><td> 200145<td></tr>
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<tr><td>grant/PI</td><td>200156</td><td> 200145<td></tr>
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<tr><td>/employee/occupation/location/type/grant/PI</td><td>200156</td><td> 200145<td></tr>
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<tr><td>employee/occupation/location/type/grant/PI</td><td>200156</td><td> 200145<td></tr>
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<tr><td>occupation/location/type/grant/PI</td><td>200156</td><td> 200145<td></tr>
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<tr><td>type/grant/PI</td><td>200156</td><td> 200145<td></tr>
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<tr><td>PI</td><td> 200156</td><td> 200145<td></tr>
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<tr><td>location/type/grant/PI</td><td>200159</td><td> 200145<td></tr>
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<tr><td>grant/PI</td><td>200159</td><td> 200145
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<tr><td>/employee/occupation/location/type/grant/PI</td><td>200159</td><td> 200145<td></tr>
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<tr><td>employee/occupation/location/type/grant/PI</td><td>200159</td><td> 200145<td></tr>
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<tr><td>occupation/location/type/grant/PI</td><td>200159</td><td> 200145<td></tr>
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<tr><td>type/grant/PI</td><td>200159</td><td> 200145<td></tr>
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<tr><td>PI</td><td>200159</td><td> 200145<td></tr>
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<tr><td>occupation/location/system</td><td>200164</td><td> 200141<td></tr>
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<tr><td>system</td><td>200164</td><td> 200141<td></tr>
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<tr><td>employee/occupation/location/system</td><td>200164</td><td> 200141<td></tr>
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<tr><td>location/system</td><td>200164</td><td> 200141<td></tr>
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<tr><td>/employee/occupation/location/system</td><td>200164</td><td> 200141<td></tr>
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<tr><td>/employee/occupation/location/location</td><td>200167</td><td> 200141<td></tr>
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<tr><td>employee/occupation/location/location</td><td>200167</td><td> 200141<td></tr>
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<tr><td>occupation/location/location</td><td>200167</td><td> 200141<td></tr>
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<tr><td>location</td><td>200167</td><td> 200141<td></tr>
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<tr><td>location/location</td><td>200167</td><td> 200141<td></tr>
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<tr><td>/employee/name</td><td>200112</td><td> 200110<td></tr>
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<tr><td>name</td><td>200112</td><td> 200110<td></tr>
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<tr><td>employee/name</td><td>200112</td><td> 200110<td></tr>
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<tr><td>/employee/name/first</td><td>200114</td><td> 200112<td></tr>
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<tr><td>name/first</td><td>200114</td><td> 200112<td></tr>
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<tr><td>/employee</td><td>200110</td><td> 200109<td></tr>
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<tr><td>employee</td><td>200110</td><td> 200109<td></tr>
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<tr><td>employee/name/first</td><td>200114</td><td> 200112<td></tr>
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<tr><td>first</td><td>200114</td><td> 200112<td></tr>
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<tr><td>name/last</td><td>200117</td><td> 200112<td></tr>
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<tr><td>/employee/name/last</td><td>200117</td><td> 200112<td></tr>
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<tr><td>employee/name/last</td><td>200117</td><td> 200112<td></tr>
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<tr><td>last</td><td>200117</td><td> 200112<td></tr>
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<tr><td>employee/address</td><td>200121</td><td> 200110<td></tr>
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<tr><td>address</td><td>200121</td><td> 200110<td></tr>
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<tr><td>/employee/address</td><td>200121</td><td> 200110<td></tr>
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<tr><td>/employee/address/street</td><td>200123</td><td> 200121<td></tr>
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<tr><td>employee/address/street</td><td>200123</td><td> 200121<td></tr>
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<tr><td>address/street</td><td>200123</td><td> 200121<td></tr>
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<tr><td>street</td><td>200123</td><td> 200121<td></tr>
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<tr><td>employee/address/city</td><td>200126</td><td> 200121<td></tr>
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<tr><td>address/city</td><td>200126</td><td> 200121<td></tr>
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<tr><td>/employee/address/city</td><td>200126</td><td> 200121<td></tr>
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<tr><td>city</td><td>200126</td><td> 200121<td></tr>
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<tr><td>address/state</td><td>200129</td><td> 200121<td></tr>
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<tr><td>/employee/address/state</td><td>200129</td><td> 200121<td></tr>
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<tr><td>employee/address/state</td><td>200129</td><td> 200121<td></tr>
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<tr><td>state</td><td>200129</td><td> 200121<td></tr>
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<tr><td>employee/address/zip</td><td>200132</td><td> 200121<td></tr>
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<tr><td>zip</td><td>200132</td><td> 200121<td></tr>
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<tr><td>/employee/address/zip</td><td>200132</td><td> 200121<td></tr>
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<tr><td>address/zip</td><td>200132</td><td> 200121<td></tr>
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<tr><td>employee/occupation</td><td>200136</td><td> 200110<td></tr>
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<tr><td>/employee/occupation</td><td>200136</td><td> 200110<td></tr>
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<tr><td>occupation</td><td>200136</td><td> 200110<td></tr>
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<tr><td>/employee/occupation/title</td><td>200138</td><td> 200136<td></tr>
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<tr><td>employee/occupation/title</td><td>200138</td><td> 200136<td></tr>
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<tr><td>occupation/title</td><td>200138</td><td> 200136<td></tr>
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<tr><td>title</td><td>200138</td><td> 200136<td></tr>
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<tr><td>location</td><td>200141</td><td> 200136<td></tr>
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<tr><td>employee/occupation/location</td><td>200141</td><td> 200136<td></tr>
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<tr><td>/employee/occupation/location</td><td>200141</td><td> 200136<td></tr>
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<tr><td>occupation/location</td><td>200141</td><td> 200136<td></tr>
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<tr><td>occupation/location/type</td><td>200143</td><td> 200141<td></tr>
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<tr><td>type</td><td>200143</td><td> 200141<td></tr>
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<tr><td>/employee/occupation/location/type</td><td>200143</td><td> 200141<td></tr>
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<tr><td>location/type</td><td>200143</td><td> 200141<td></tr>
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<tr><td>employee/occupation/location/type</td><td>200143</td><td> 200141<td></tr>
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<tr><td>type/grant</td><td>200145</td><td> 200143<td></tr>
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<tr><td>occupation/location/type/grant</td><td>200145</td><td> 200143<td></tr>
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<tr><td>grant</td><td>200145</td><td> 200143<td></tr>
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<tr><td>location/type/grant</td><td>200145</td><td> 200143<td></tr>
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<tr><td>/employee/occupation/location/type/grant</td><td>200145</td><td> 200143<td></tr>
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<tr><td>employee/occupation/location/type/grant</td><td>200145</td><td> 200143<td></tr>
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<tr><td>grant/name</td><td>200147</td><td> 200145<td></tr>
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<tr><td>/employee/occupation/location/type/grant/name</td><td>200147</td><td> 200145<td></tr>
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<tr><td>occupation/location/type/grant/name</td><td>200147</td><td> 200145<td></tr>
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<tr><td>name</td><td>200147</td><td> 200145<td></tr>
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<tr><td>type/grant/name</td><td>200147</td><td> 200145<td></tr>
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<tr><td>location/type/grant/name</td><td>200147</td><td> 200145<td></tr>
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<tr><td>employee/occupation/location/type/grant/name</td><td>200147</td><td> 200145<td></tr>
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<tr><td>/employee/occupation/location/type/grant/grantor</td><td>200150</td><td> 200145<td></tr>
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<tr><td>type/grant/grantor</td><td>200150</td><td> 200145<td></tr>
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<tr><td>grant/grantor</td><td>200150</td><td> 200145<td></tr>
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<tr><td>employee/occupation/location/type/grant/grantor</td><td>200150</td><td> 200145<td></tr>
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</table>
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<br>
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<a name="xml_nodes"></a>
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<p>The following is the document in xml_nodes.</p>
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<br>
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<table border="1">
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<tr>
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<td><b>nodeid</b></td><td><b>nodetype</b></td><td><b>nodename</b></td>
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<td><b>nodedata</b></td><td><b>rootnodeid</b></td><td><b>parentnodeid</b></td>
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</tr>
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<tr><td>200164</td> <td>ELEMENT </td> <td>system</td><td> </td><td>200109</td><td>200141</td> </tr>
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<tr><td>200165</td> <td>TEXT </td> <td> </td><td>UC</td><td>200109</td><td>200164</td> </tr>
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<tr><td>200166</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200141</td> </tr>
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<tr><td>200167</td> <td>ELEMENT </td> <td> location</td><td> </td><td>200109</td><td>200141</td> </tr>
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<tr><td>200168</td> <td>TEXT </td> <td> </td><td>Santa Barbara</td><td>200109</td><td>200167</td> </tr>
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<tr><td>200169</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200141</td> </tr>
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<tr><td>200170</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200136</td> </tr>
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<tr><td>200171</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200110</td> </tr>
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<tr><td>200109</td> <td>DOCUMENT </td> <td> employee</td><td> </td><td>200109</td><td> </td> </tr>
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<tr><td>200110</td> <td>ELEMENT </td> <td> employee</td><td> </td><td>200109</td><td>200109</td> </tr>
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<tr><td>200111</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200110</td> </tr>
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<tr><td>200112</td> <td>ELEMENT </td> <td> name</td><td> </td><td>200109</td><td>200110</td> </tr>
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<tr><td>200113</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200112</td> </tr>
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<tr><td>200114</td> <td>ELEMENT </td> <td> first</td><td> </td><td>200109</td><td>200112</td> </tr>
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<tr><td>200115</td> <td>TEXT </td> <td> </td><td>Chad</td><td>200109</td><td>200114</td> </tr>
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<tr><td>200116</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200112</td> </tr>
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<tr><td>200117</td> <td>ELEMENT </td> <td> last</td><td> </td><td>200109</td><td>200112</td> </tr>
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<tr><td>200118</td> <td>TEXT </td> <td> </td><td>Berkley</td><td>200109</td><td>200117</td> </tr>
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<tr><td>200119</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200112</td> </tr>
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<tr><td>200120</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200110</td> </tr>
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<tr><td>200121</td> <td>ELEMENT </td> <td> address</td><td> </td><td>200109</td><td>200110</td> </tr>
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<tr><td>200122</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200121</td> </tr>
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<tr><td>200123</td> <td>ELEMENT </td> <td> street</td><td> </td><td>200109</td><td>200121</td> </tr>
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<tr><td>200124</td> <td>TEXT </td> <td> </td><td>735 State St. Ste. 303</td><td>200109</td><td>200123</td> </tr>
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<tr><td>200125</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200121</td> </tr>
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<tr><td>200126</td> <td>ELEMENT </td> <td> city</td><td> </td><td>200109</td><td>200121</td> </tr>
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<tr><td>200127</td> <td>TEXT </td> <td> </td><td>Santa Barbara</td><td>200109</td><td>200126</td> </tr>
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<tr><td>200128</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200121</td> </tr>
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<tr><td>200129</td> <td>ELEMENT </td> <td> state</td><td> </td><td>200109</td><td>200121</td> </tr>
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<tr><td>200130</td> <td>TEXT </td> <td> </td><td>California</td><td>200109</td><td>200129</td> </tr>
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221
|
<tr><td>200131</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200121</td> </tr>
|
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222
|
<tr><td>200132</td> <td>ELEMENT </td> <td> zip</td><td> </td><td>200109</td><td>200121</td> </tr>
|
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223
|
<tr><td>200133</td> <td>TEXT </td> <td> </td><td>93101</td><td>200109</td><td>200132</td> </tr>
|
|
224
|
<tr><td>200134</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200121</td> </tr>
|
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225
|
<tr><td>200135</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200110</td> </tr>
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|
226
|
<tr><td>200136</td> <td>ELEMENT </td> <td> occupation</td><td> </td><td>200109</td><td>200110</td> </tr>
|
|
227
|
<tr><td>200137</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200136</td> </tr>
|
|
228
|
<tr><td>200138</td> <td>ELEMENT </td> <td> title</td><td> </td><td>200109</td><td>200136</td> </tr>
|
|
229
|
<tr><td>200139</td> <td>TEXT </td> <td> </td><td>Metadata Systems Developer</td><td>200109</td><td>200138</td> </tr>
|
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230
|
<tr><td>200140</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200136</td> </tr>
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|
231
|
<tr><td>200141</td> <td>ELEMENT </td> <td> location</td><td> </td><td>200109</td><td>200136</td> </tr>
|
|
232
|
<tr><td>200142</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200141</td> </tr>
|
|
233
|
<tr><td>200143</td> <td>ELEMENT </td> <td> type</td><td> </td><td>200109</td><td>200141</td> </tr>
|
|
234
|
<tr><td>200144</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200143</td> </tr>
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|
235
|
<tr><td>200145</td> <td>ELEMENT </td> <td> grant</td><td> </td><td>200109</td><td>200143</td> </tr>
|
|
236
|
<tr><td>200146</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
237
|
<tr><td>200147</td> <td>ELEMENT </td> <td> name</td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
238
|
<tr><td>200148</td> <td>TEXT </td> <td> </td><td>DBA</td><td>200109</td><td>200147</td> </tr>
|
|
239
|
<tr><td>200149</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
240
|
<tr><td>200150</td> <td>ELEMENT </td> <td> grantor</td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
241
|
<tr><td>200151</td> <td>TEXT </td> <td> </td><td>NSF</td><td>200109</td><td>200150</td> </tr>
|
|
242
|
<tr><td>200152</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
243
|
<tr><td>200153</td> <td>ELEMENT </td> <td> PI</td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
244
|
<tr><td>200154</td> <td>TEXT </td> <td> </td><td>Jim Reichman</td><td>200109</td><td>200153</td> </tr>
|
|
245
|
<tr><td>200155</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
246
|
<tr><td>200156</td> <td>ELEMENT </td> <td> PI</td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
247
|
<tr><td>200157</td> <td>TEXT </td> <td> </td><td>Matt Jones</td><td>200109</td><td>200156</td> </tr>
|
|
248
|
<tr><td>200158</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200145</td> </tr
|
|
249
|
<tr><td>200159</td> <td>ELEMENT </td> <td> PI</td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
250
|
<tr><td>200160</td> <td>TEXT </td> <td> </td><td>Mark Schilhauer</td><td>200109</td><td>200159</td> </tr>
|
|
251
|
<tr><td>200161</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200145</td> </tr>
|
|
252
|
<tr><td>200162</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200143</td> </tr>
|
|
253
|
<tr><td>200163</td> <td>TEXT </td> <td> </td><td> </td><td>200109</td><td>200141</td> </tr>
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254
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</table>
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