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<table class="confluenceTable"><tbody>
<tr>
<td class="confluenceTd"><p> Module: </p></td>
<td class="confluenceTd"><p> Aggregating DataStore </p></td>
</tr>
<tr>
<td class="confluenceTd"><p> Module Maintainer: </p></td>
<td class="confluenceTd"><p> <a class="confluence-link confluence-userlink" data-username="shansen@lisasoft" href="/display/~shansen@lisasoft" data-linked-resource-id="12189770" data-linked-resource-type="userinfo" username="shansen@lisasoft" data-linked-resource-default-alias="Stefan Hansen" data-base-url="http://docs.codehaus.org">Stefan Hansen</a> </p></td>
</tr>
<tr>
<td class="confluenceTd"><p> Status: </p></td>
<td class="confluenceTd"><p> <table class="wysiwyg-macro" data-macro-name="excerpt" data-macro-parameters="atlassian-macro-output-type=INLINE" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2V4Y2VycHQ6YXRsYXNzaWFuLW1hY3JvLW91dHB1dC10eXBlPUlOTElORX0&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="RICH_TEXT"><tr><td class="wysiwyg-macro-body"><p><img class="emoticon emoticon-red-star" data-emoticon-name="red-star" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/star_red.png" alt="(red star)" title="(red star)" /><img class="emoticon emoticon-red-star" data-emoticon-name="red-star" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/star_red.png" alt="(red star)" title="(red star)" /><img class="emoticon emoticon-red-star" data-emoticon-name="red-star" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/star_red.png" alt="(red star)" title="(red star)" /><img class="emoticon emoticon-red-star" data-emoticon-name="red-star" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/star_red.png" alt="(red star)" title="(red star)" /><img class="emoticon emoticon-red-star" data-emoticon-name="red-star" border="0" src="/s/en_GB/3278/15/_/images/icons/emoticons/star_red.png" alt="(red star)" title="(red star)" /></p></td></tr></table> </p></td>
</tr>
<tr>
<td class="confluenceTd"><p> Email Help: </p></td>
<td class="confluenceTd"><p> Geotools-gt2-users@lists.sourceforge.net </p></td>
</tr>
<tr>
<td class="confluenceTd"><p> Volunteer: </p></td>
<td class="confluenceTd"><p> geotools-devel@lists.sourceforge.net </p></td>
</tr>
<tr>
<td class="confluenceTd"><p> IP Review: </p></td>
<td class="confluenceTd"><p> <a href="http://svn.geotools.org/geotools/trunk/gt/modules/plugin/Aggregating DataStore/review.txt">review.txt</a> </p></td>
</tr>
<tr>
<td class="confluenceTd"><p> Plug-in: </p></td>
<td class="confluenceTd"><p> DataStoreFactorySPI </p></td>
</tr>
</tbody></table>

<h2>Description</h2>

<p>A data store that aggregates the responses of other, cascaded WFSs in<br />
one response.</p>

<p>The datastore uses the WFS-datastore to communicate with the cascaded<br />
WFS (therefore, it is restricted to WFS 1.0). From the WFS-datastores<br />
it retrieves responses to a request and aggregates them into one<br />
response, which is then passed on.</p>

<p>So far the aggregation part of the datastore is rather limited. Apart<br />
from making sure the features match the common schema (ie. removing<br />
attributes that are not part of the schema and mapping the<br />
FeatureTypeName if necessary), they are passed on without being<br />
changed.</p>

<p>The FeatureTypes provided by the datastore are defined in a<br />
config-file as well as the configuration of the cascaded WFS. The<br />
configuration of the WFS contains at the moment the URL to the WFS,<br />
the supported FeatureTypes and the mapping of the FeatureTypeNames<br />
(This is for example necessary, if other Geoservers are cascaded).</p>

<p>The Aggregating DataStore is supposed to be used within Geoserver<br />
1.6. Hence, it has been implmented as a GeoTools 2.4.x module.</p>

<h2>Recent Development</h2>

<p>The next step is to test the datastore in real life.</p>

<h2>Module Status</h2>

<p>The project is still in an early stage. Most of the required<br />
functionality has been implemented, but so far we haven't had the<br />
opportunity to do run too many tests.</p>