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The DiffService
service is used to show the differences between the page versions. The
configuration of this service is found in wiki-service/src/main/resources/conf/portal/configuration.xml:
Sample configuration:
<component>
<key>org.exoplatform.wiki.service.diff.DiffService</key>
<type>org.exoplatform.wiki.service.diff.DiffService</type>
</component>