ACN2 = http://www.w3.org/namespaces/2000/15-meeting/ACNov2000
ACN2Fields = $(ACN2)/Fields
ACN2Arrive = $(ACN2)/_plan_to_arrive
(______) 
    |-hasEmail-> mailto:joe@a.com
    `-registers-> (______)
                     |-ACN2Arrive-> (______)
                     |                |-date:str-> [10001115]
                     |                `-type-> (date:Date)
                     |-ACN2Depart-> (______)
                     |                |-date:str-> [10001117]
                     |                `-type-> (date:Date)
                    type
                     V
                  (ACN2) -fields-> (ACN2Fields)    
(reg:Meeting) <-type-|               |-li-> (ACN2Arrive) -type-> (Property)
             <-start-|               |        |-domain-> (ACN2)
               <-end-|               |        |-range-> (date:Date)
            <-cutoff-|               |        `-string-> [plan to arrive]
             <-blurb-|               `-li-> (ACN2Depart) -type-> (Property)
               <-end-|                        |-domain-> (ACN2)
            <-cutoff-'                        |-range-> (date:Date)
                                              `-string-> [plan to depart]