2002-03-10 11:16:03 -05:00
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2002-03-15 20:41:58 -05:00
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2002-03-10 11:16:03 -05:00
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<title>Record Generator HOWTO</title>
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2002-03-15 20:41:58 -05:00
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2002-03-10 11:16:03 -05:00
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2002-03-15 20:41:58 -05:00
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2002-03-15 20:41:58 -05:00
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<td valign="top" align="left"><a href="http://jakarta.apache.org/index.html"><img hspace="0" vspace="0" border="0" src="images/jakarta-logo.gif"></a></td><td width="100%" valign="top" align="left" bgcolor="#ffffff"><img hspace="0" vspace="0" border="0" align="right" src="images/header.gif"></td>
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2002-03-10 11:16:03 -05:00
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<td colspan="2" bgcolor="#525d76"><span class="c1"><a class="black" href="http://www.apache.org/">www.apache.org ></a><a class="black" href="http://jakarta.apache.org/">jakarta.apache.org ></a><a href="http://jakarta.apache.org/poi/" class="black">jakarta.apache.org/poi</a></span></td>
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<a class="s1" href="../index.html">Main</a>
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<span class="s1">HSSF</span>
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<a class="s1" href="how-to.html">HOWTO</a>
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<a class="s1" href="use-case.html">Use Case</a>
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<a class="s1" href="diagrams.html">Pictorial Docs</a>
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<hr>
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<span class="s1">Contributer's Guide</span>
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<br>
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<a class="s1" href="record-generator.html">Record Generator</a>
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<title>Record Generator HOWTO</title>
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<td bgcolor="#f3dd61"><span class="title">Record Generator HOWTO</span></td>
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</table>
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<font size="-2" color="#000000">
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<p>
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<a href="mailto:"></a>
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</p>
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</font>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="100%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+1"><font face="Arial,sans-serif"><b>How to Use the Record Generator</b></font></font></td>
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</tr>
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<tr>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>History</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">
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The record generator was born from frustration with translating
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the Excel records to Java classes. Doing this manually is a time
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consuming process. It's also very easy to make mistakes.
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</p>
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<p align="justify">
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A utility was needed to take the defintition of what a
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record looked like and do all the boring stuff. Thus the
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record generator was born.
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</p>
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</td>
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</tr>
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</table>
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</div>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Capabilities</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">
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The record generator takes XML as input and produced the following
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output:
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<ul>
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<li>A Java file capabile of decoding and encoding the record.</li>
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<li>A test class with provides a fill-in-the-blanks implementation of a test case
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for ensuring the record operates as designed.</li>
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</ul>
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</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Usage</b></font></font></td>
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</tr>
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<tr>
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<td>
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<br>
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<p align="justify">
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The record generator is invoked as an Ant target (generate-records). It goes
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through looking for all files in src/records/defintitions ending with _record.xml.
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It then creates two files; the Java record definition and the Java test case template.
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</p>
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<p align="justify">
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The records themselves have the following general layout:
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</p>
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<div align="center">
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<table cellspacing="2" cellpadding="2" border="1">
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<tr>
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<td>
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<pre>
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<record id="0x1032" name="Frame" package="org.apache.poi.hssf.record">
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<description>The frame record indicates whether there is a border
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around the displayed text of a chart.</description>
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<author>Glen Stampoultzis (glens at apache.org)</author>
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<fields>
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<field type="int" size="2" name="border type">
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<const name="regular" value="0" description="regular rectangle or no border"/>
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<const name="shadow" value="1" description="rectangle with shadow"/>
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</field>
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<field type="int" size="2" name="options">
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<bit number="0" name="auto size"
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description="excel calculates the size automatically if true"/>
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<bit number="1" name="auto position"
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description="excel calculates the position automatically"/>
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</field>
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</fields>
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</record>
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</pre>
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</td>
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</tr>
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</table>
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</div>
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<p align="justify">
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Currently the type can be of type int, float or string. The 'int'
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type covers bytes, shorts and integers which is selected using a
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size of 1, 2 or 4. An additional type called varword is used to
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represent a array of word values where the first short is the length
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of the array. The string type generation is only partially
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implemented. If choosing string you must select a size of 'var'.
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</p>
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<p align="justify">
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The Java records are regenerated each time the record generator is
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run, however the test stubs are only created if the test stub does
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not already exist. What this means is that you may change test
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stubs but not the generated records.
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</p>
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</td>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>How it Works</b></font></font></td>
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</tr>
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<br>
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<p align="justify">
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The record generation works by taking an XML file and styling it
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using XLST. Given that XSLT is a little limited in some ways it was
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necessary to add a little Java code to the mix.
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</p>
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<p align="justify">
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See record.xsl, record_test.xsl, FieldIterator.java,
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RecordUtil.java, RecordGenerator.java
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</p>
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</td>
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</tr>
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</table>
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</div>
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<br>
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<div align="right">
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<table cellspacing="0" cellpadding="2" border="0" width="99%">
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<tr>
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<td bgcolor="#525D76"><font color="#ffffff" size="+0"><font face="Arial,sans-serif"><b>Limitations</b></font></font></td>
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</tr>
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<tr>
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<br>
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<p align="justify">
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The record generator does not handle all possible record types and
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is not ment to. Sometimes it's going to make more sense to generate
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the records manually. The main point of this thing is to make the
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easy stuff simple.
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</p>
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<p align="justify">
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Currently the record generator is optimized to create Excel records.
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It could be adapted to create Word records with a little poking
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around.
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</p>
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<p align="justify">
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Currently the the XSL file that generates the record calls out to
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Java objects. This would have been better done as Javascript inside
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the XSL file itself. The Java code for the record generation is
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currently quite messy with minimal comments.
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</p>
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</td>
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</table>
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</table>
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<br>
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2002-03-15 20:41:58 -05:00
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<table width="100%" border="0" cellspacing="0" cellpadding="0">
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<tbody>
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<hr noshade="" size="1">
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</td>
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<tr>
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<td align="center"><i>Copyright © 2002 Apache Software Foundation</i></td>
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<td align="right" width="100%"><a href="http://krysalis.org/"><img alt="Krysalis Logo" src="images/krysalis-compatible.png"></a><a href="http://xml.apache.org/cocoon/"><img alt="Cocoon Logo" src="images/built-with-cocoon.png"></a></td>
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