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<!--
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* datafiles.html
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*
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* Authors: Chad Berkley
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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: 2001 January 23
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* Version:
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* File Info: '$ '
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*
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*
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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">Non-XML Data Files</p></td>
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<td class="tablehead" colspan="2" align="right">
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<a href="./replication.html">Back</a> | <a href="./metacattour.html">Home</a> |
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<a href="./properties.html">Next</a>
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</td>
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</tr>
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</table>
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<p><br>
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<a href="./replication.html">Back</a> | <a href="./metacattour.html">Home</a> |
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<a href="./properties.html">Next</a> </p>
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<p><br>
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</p>
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<p><u>What is an LSID:</u></p>
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<p>LSID's were designed to be a globally-recognized short identifiers for a complex
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entities that are both computer and human readable.</p>
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<p> </p>
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<p><u>Why LSID's are in Metacat:</u></p>
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<p>We chose to incorporate LSID's in metacat so as to support a globally accepted
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standard for identifying biological entities instead of using a proprietary
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scheme.
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By doing this we have exposed data and metadata stored in Metacat through
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a variety of LSID clients. Additionally, the LSID support in Metacat has
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been implemented as a series Simple Object Access Protocol (SOAP) interfaces
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with the intent of providing an easily modifiable system.</p>
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<p> </p>
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<p><u>What you get with Metacat's LSID Support:</u></p>
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<p>By enabling the Metacat LSID support you will be able to use the LSID clients
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and notation to query Metacat for data and metadata. An example of an LSID
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client is the <a href="http://lsid.sourceforge.net/">LSID Launchpad</a>. Furthermore,
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one can use the LSID notation directly in the Metacat http query to access
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data and metadata within a Metacat.
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For example, a document (tao.12039.1) stored in a Metacat available at: http://qtz.homelinux.com:9999
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can be accessed by the following http Metacat queries:</p>
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<br>
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<pre>http://qtz.homelinux.com:9999/authority/data?lsid=urn:lsid:sulphur.ecoinformatics.org:tao:12039:1</pre>
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<pre>http://qtz.homelinux.com:9999/authority/metadata?lsid=urn:lsid:sulphur.ecoinformatics.org:tao:12039:1</pre>
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<br>
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<p>The first query returns the data associated with that document and the second
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query returns the metadata. Notice that the periods in the Metacat document
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ID have been replaced with colons. Also notice the host urn attribute
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(urn:lsid:sulphur.ecoinformatics.org), this host needs to be set as a SRV record
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as DNS entry on the DNS server for ecoinformatics.org. To use LSID support
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in Metacat the Metacat administrator does need to have access to the DNS server
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for the domain hosting the Metacat so that he/she can modify the SRV record(s).
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The Metacat build.proprties LSID attributes for the above example are: </p>
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<pre>authority.context=authority</pre>
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<pre>config.lsidauthority=sulphur.ecoinformatics.org</pre>
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<p>** the SRV record for sulphur.ecoinformatics.org points to qtz.homelinux.com
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on port 9999</p>
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<p> </p>
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<p> </p>
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<p> </p>
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</BODY>
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</HTML>
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