nsIMicrosummary Interface

 Add a microsummary observer to this microsummary.

 @param observer
        the microsummary observer to add

void addObserver(in nsIMicrosummaryObserver observer)

 Remove a microsummary observer from this microsummary.

 @param observer
        the microsummary observer to remove

void removeObserver(in nsIMicrosummaryObserver observer)

 Update the microsummary, first loading its generator and page content
 as necessary.  If you want know when a microsummary finishes updating,
 add an observer before calling this method.

void update()