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• field (mandatory): The metadata field to be highlighted (can also be * if all the metadata fields should be highlighted).
• maxSize (optional): Limit the number of characters displayed to only the relevant part (use metadata field as search snippet).
• snippets (optional): The maximum number of snippets that can be found in one metadata field.

'More like this' configuration

The 'more like this'-configuration element contains all the settings for displaying related items on an item display page.
Below is an example of the "more like this" configuration.

Hit highlighting technical details

The org.dspace.discovery.DiscoveryQuery object has a setter & getter for the hit highlighting configuration set in Discovery configuration. If this configuration is given the resolveToSolrQuery method located in the org.dspace.discovery.SolrServiceImpl class will use the standard Solr highlighting feature (http://wiki.apache.org/solr/HighlightingParameters). The org.dspace.discovery.DiscoverResult class has a method to set the highlighted fields for each object & field.

The rendering of search results is no longer handled by the METS format but uses a special type of list named "TYPE_DSO_LIST". Each metadata field (& fulltext if configured) is added in the DRI and IF the field contains hit higlighting the Java code will split up the string & add DRI highlights to the list. The XSL for the themes also contains special rendering XSL for the DRI; for Mirage, the changes are located in the discovery.xsl file. For themes using the old themes based on structural.xsl, look for the template matching "dri:list[@type='dsolist']".

'More like this' configuration

The 'more like this'-configuration element contains all the settings for displaying related items on an item display page.
Below is an example of the "more like this" configuration.

<property name="moreLikeThisConfiguration">
    <bean class="org.dspace.discovery.configuration.DiscoveryMoreLikeThisConfiguration">
        

<property name="moreLikeThisConfiguration">
    <bean class="org.dspace.discovery.configuration.DiscoveryMoreLikeThisConfiguration">
        <property name="similarityMetadataFields">
            <list>
                <value>dc.contributor.author</value>
                <value>dc.creator</value>
                <value>dc.subject</value>
            </list>
        </property>
        <!--The minimum number of matching terms accross the metadata fields above before an item is found as related -->
        <property name="minTermFrequency" value="5"/>
        <!--The maximum number of related items displayed-->
        <property name="max" value="3"/>
    </bean>
</property>

The property name & the bean class are mandatory. The property field names are discussed below.

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 name="max" value="3"/>
    </bean>
</property>

The property name & the bean class are mandatory. The property field names are discussed below.

• similarityMetadataFields: the metadata fields checked for similarity
• minTermFrequency: The minimum number of matching terms accross the metadata fields above before an item is found as related
• max: The maximum number of related items displayed

"More like this" technical details

The org.dspace.discovery.SearchService object has received a getRelatedItems() method. This method requires an item & the more-like-this configuration bean from above. This method is implemented in the org.dspace.discovery.SolrServiceImpl which uses the item as a query & uses the default Solr parameters for more-like-this to pass the bean configuration to solr (http://wiki.apache.org/solr/MoreLikeThis). The result will be a list of items or if none found an empty list. The rendering of this list is handled in the org.dspace.app.xmlui.aspect.discovery.RelatedItems class.

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Discovery Solr Index Maintenance

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