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<title>DependSet Task</title>
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<h2>DependSet</h2>

A task to manage arbitrary dependencies between files.

<h3>Description</h3>

<p>
The dependset task compares a set of source files with a set of target
files.  If any of the source files is more recent than any of
the target files, all of the target files are removed.  
</p>
<p>
Source files and target files are specified via nested <a
href="../CoreTypes/fileset.html">FileSets</a> and/or nested <a
href="../CoreTypes/filelist.html">FileLists</a>.  Arbitrarily many
source and target filesets/filelists may be specified, but at 
least one filelist/fileset is required for both sources and targets.
</p>
<p>
Use a FileSet when you want to use wildcard include or exclude
patterns and don't care about missing files.  Use a FileList when you
want to consider the non-existence of a file as if it were out of
date.  If there are any non-existing files in any source or target
FileList, all target files will be removed.
</p>
<p>
DependSet is useful to capture dependencies that are not or cannot be
determined algorithmically.  For example, the <code>&lt;style&gt;</code> task only
compares the source XML file and XSLT stylesheet against the target
file to determined whether to restyle the source.  Using dependset you
can extend this dependency checking to include a DTD or XSD file as
well as other stylesheets imported by the main stylesheet.
</p>

<h3>Parameters</h3>

<p>
(none)
</p>

<h3>Parameters Specified as Nested Elements</h3>

<h4>srcfileset</h4>

<p>
The nested <code>srcfileset</code> element specifies a <a
href="../CoreTypes/fileset.html">FileSet</a>. All files included in
this fileset will be compared against all files included in all of the
<code>targetfileset</code> filesets and <code>targetfilelist</code>
filelists.  Multiple <code>srcfileset</code> filesets may be specified.
</p>

<h4>srcfilelist</h4>

<p>
The nested <code>srcfilelist</code> element specifies a <a
href="../CoreTypes/filelist.html">FileList</a>. All files included in
this filelist will be compared against all files included in all of the 
<code>targetfileset</code> filesets and <code>targetfilelist</code>
filelists.  Multiple <code>srcfilelist</code> filelists may be specified.
</p>

<h4>targetfileset</h4>

<p>
The nested <code>targetfileset</code> element specifies a <a
href="../CoreTypes/fileset.html">FileSet</a>.  All files included in
this fileset will be compared against all files included in all of the
<code>srcfileset</code> filesets and <code>sourcefilelist</code>
filelists, and if any are older, they are all deleted.
Multiple <code>targetfileset</code> filesets may be specified.
</p>

<h4>targetfilelist</h4>

<p>
The nested <code>targetfilelist</code> element specifies a <a
href="../CoreTypes/filelist.html">FileList</a>.  All files included in
this filelist will be compared against all files included in all of the
<code>srcfileset</code> filesets and <code>sourcefilelist</code>
filelists, and if any are older, they are all deleted.
Multiple <code>targetfilelist</code> filelists may be specified.
</p>

<h3>Examples</h3>
<blockquote> <pre>    
    &lt;dependset&gt;
       &lt;srcfilelist
           dir   = &quot;${dtd.dir}&quot;
           files = &quot;paper.dtd,common.dtd&quot;/&gt;
       &lt;srcfilelist
           dir   = &quot;${xsl.dir}&quot;
           files = &quot;common.xsl&quot;/&gt;
       &lt;srcfilelist
           dir   = &quot;${basedir}&quot;
           files = &quot;build.xml&quot;/&gt;
       &lt;targetfileset
           dir      = &quot;${output.dir}&quot;
           includes = &quot;**/*.html&quot;/&gt;
    &lt;/dependset&gt;  </pre>
</blockquote>

<p> 
In this example derived HTML files in the ${output.dir} directory 
will be removed if any are out-of-date with respect to:</p>
<ol>
<li>the DTD of their source XML files</li>
<li>a common DTD (imported by the main DTD)</li>
<li>a subordinate XSLT stylesheet (imported by the main stylesheet), or</li>
<li>the buildfile</li>
</ol>

<p>
If any of the source files in the above example does not exist, all
target files will also be removed.  To ignore missing source files instead,
use filesets instead of filelists for the source files.
</p>

<hr>
<p align="center">Copyright &copy; 2001,2004-2005 The Apache Software Foundation.
All rights
Reserved.</p>

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