Each plug-in that contributes an Eclipse context XML file must declare an extension to org.eclipse.help.contexts in its plug-in manifest (plugin.xml file).
For example:
    <extension point="org.eclipse.help.contexts">
        <contexts file="dtp_contexts.xml"
            plugin="org.eclipse.datatools.connectivity.ui"/>
    </extension>
        For more information about Eclipse context XML files and contributing them, see Describing and packaging context-sensitive help content in the Platform Plug-in Developer Guide.