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public class CustomMediaItemVersionFBO extends MediaItemArticleVersionFBO {
	...
	public String getHelpTopicsId() {
	    return Activator.OH_ANCHOR_INTRODUCTION;
	}
}

In this example the ID of the actual help topic is defined statically (as public static final String) in the Activator. This is the proper location for such definitions since the Activator usually also defines namespaces, bundle and component IDs.