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Howto: Use DSpace Discovery The Discovery Module enables your repository to have faceted searching.
Thus a user can filter what they are looking for by grouping entries into a facet, and drill down to find the content they are interested in. 
So instead of user searching: [ wetland + "dc.author=Mitsch, William J" + dc.subject="water quality" ], they can instead do their initial search, [ wetland ], and then filter the results by attributes.

A website like Amazon, might do this to help you select a digital camera. You can reduce the results by price range, features, megapixels, manufacturer, etc.
The further the DSpace Discovery module is developed, the more useful that browsing can be to the researcher looking for items in your collections.
Checkout the projects source

  1. A Fresh Copy of the DSpace Trunk
    svn checkout {+}http://scm.dspace.org/svn/repo/dspace/trunk/+ dspace-trunk
  2. The Discovery Modulesvn checkout http://scm.dspace.org/svn/repo/modules/dspace-discovery/trunk/ dspace-discovery Reference
    For reference, look at the Dryad project {+}http://code.google.com/p/dryad/+ as that is using the discovery layer.
    http://code.google.com/p/dryad/ Overview
    Have both projects checked out to the same root projects folder. You will not have to modify dspace-discovery at all, but the patch will enable the dspace-trunk to use some features of dspace services, and include other libraries such as org.apache.solr that are needed.
    The discovery module essentially adds an additional core to solr. Existing was statistics, the new core is search. 
    To patch: 
    cd /path/to/project/dspace-trunk/dspace
    patch -p1 < /path/to/discovery-applied-to-dspace-trunk.patch
    If you name discovery-trunk anything other than that, you will have to modify dspace-trunk/dspace/pom.xml accordingly.
    Then the regular rebuild process applies. It may be necessary to do a mvn clean package.

In config/dspace-solr-search.cfg and dspace.cfg is a setting for:
solr.search.server = http://127.0.0.1:8080/solr
Adjust that if necessary.
After the patch, you will need to set solr/home. Modify /dspace/webapps/solr/WEB-INF/web.xml to use your solr/home. 
    <env-entry>
       <env-entry-name>solr/home</env-entry-name>
       <env-entry-value>/dspace/solr</env-entry-value>
       <env-entry-type>java.lang.String</env-entry-type>
    </env-entry>

Once you've restarted your {tomcat} server, and SOLR is up and running, you'll need to index your content.
[/dspace/bin/] ./dspace update-discovery-index

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