How to add two help contents in eclipse RCP application?

Question

In my application I want to add two help contents. Currently I have only one contents in my help book. To add a new one I have declared another help plugin and Tried to add that in to product dependencies. But my second help did not appear in the help book. Am i missing something here? 2 contents snapshot:

I want to do something like this

Any help on this will be appreciated.

Toc.xml

<?xml version="1.0" encoding="UTF-8"?>
<?NLS TYPE="org.eclipse.help.toc"?>

<toc label="XXX">
    <topic label="Main Topic"  href="html/maintopic.html"> 
        <topic label="Sub Topic" href="html/subtopic.html"/> 
    </topic>
    <topic label="Main Topic 2"/>
</toc>

Answer 1

Looking at the Eclipse help plug-ins they just use:

<extension point="org.eclipse.help.toc"> 
   <toc file="toc.xml" primary="true" />
</extension>

in each plugin.xml. The toc.xml is like yours.