# helpKey Properties Files Extension

Each plug-in that contributes helpKey properties files must declare an extension to org.eclipse.datatools.help.helpKeyProperties in its plug-in manifest (plugin.xml file).

For example:

        <extension point="org.eclipse.datatools.help.helpKeyProperties">
            <contextIds plugin="org.eclipse.datatools.connectivity.ui"
                file="org.eclipse.datatools.connectivity.ui.contextIds.properties"/>
            <searchExpressions plugin="org.eclipse.datatools.connectivity.ui"
                file="org.eclipse.datatools.connectivity.ui.searchExpressions.properties"/>
        </extension>

The `<contextIds>` element identifies a helpKey properties file that defines help context IDs, and the UI plug-in for which it is provided.

The `<searchExpressions>` element identifies a helpKey properties file that defines context-specific help search expressions, and the UI plug-in for which it is provided.

To accommodate context-sensitive help plug-ins that serve more than one UI plug-in, the `<extension>` element can contain any number of `<contextIds>` and `<searchExpressions>` elements.

Parent topic: Context-Sensitive Help UA Plug-ins