Address Book allows you to set four web addresses for work, home, calendar and freebusy. These addresses are defined in the 'onlineInfos ' template. The 'onlineInfos' template calls the following:
'weburl' that passes the priority for ordered display
'calendar' with type=”calendar” for calendar url and type=”freebusy” for freebusyurl ”
You may change the order in which these addresses similar to the examples illustrated above.