hcalendar-profile
vcalendar - A container for one or more events (vevent)
vevent - A container for one event
dtstart - Date/time of the start of the event
dtend - Date/time of the end of the event
duration - Length of the event
summary - Short synopsis of the event, or the title of the event, or the name of the event
uid - A globally unique identifier for the event; typically a URL is used
dtstamp - Date/time of when the document containing information about the event was created
method - Values for this property are: PUBLISH, REQUEST, REPLY, ADD, CANCEL, REFRESH, COUNTER, or DECLINECOUNTER. For example, a value of REQUEST indicates that a request is being made for the event to occur
category - Common values are: MEETING, APPOINTMENT. Note: this property may be repeated
location - Tells where the event is to be held
url - A URL to a page that contains the definitive/preferred information about an event; uid and url are typically the same
description - A more detailed synopsis of the event than that provided by summary
last-modified - Date/time the information about the event was updated
status - Values are: TENTATIVE, CONFIRMED, CANCELLED
class - Access classification of the event information; values are: PUBLIC, PRIVATE, CONFIDENTIAL