CALSCALE             TEXT
METHOD               METHOD		# Non-std. RFC2445 specifies TEXT
PRODID               TEXT
VERSION              TEXT
CATEGORIES           TEXT
CLASS                TEXT
COMMENT              TEXT
DESCRIPTION          TEXT
LOCATION             TEXT
PERCENT-COMPLETE     INTEGER
PRIORITY             INTEGER
RESOURCES            TEXT
STATUS               TEXT
SUMMARY              TEXT
COMPLETED            DATE-TIME
FREEBUSY             PERIOD
TRANSP               TEXT
TZNAME               TEXT
TZOFFSETFROM         UTC-OFFSET
TZOFFSETTO           UTC-OFFSET
TZURL                URI
TZID                 TEXT
ATTENDEE             CAL-ADDRESS
CONTACT              TEXT
ORGANIZER            CAL-ADDRESS
RELATED-TO           TEXT
URL                  URI
UID                  TEXT
EXRULE               RECUR
RRULE                RECUR
ACTION               TEXT
REPEAT               INTEGER
CREATED              DATE-TIME
DTSTAMP              DATE-TIME
LAST-MODIFIED        DATE-TIME
SEQUENCE             INTEGER
X-LIC-ERROR	     TEXT
X-LIC-CLUSTERCOUNT   INTEGER
REQUEST-STATUS       TEXT
ATTACH               ATTACH             # Non-std: URI or BINARY
GEO                  GEO                # Non-std: Two FLOATS
DTEND                DATE-TIME-DATE     # Non-std: DATE-TIME or DATE
DUE                  DATE-TIME-DATE     # Non-std: DATE-TIME or DATE
DTSTART              DATE-TIME-DATE     # Non-std: DATE-TIME or DATE
RECURRENCE-ID        DATE-TIME-DATE     # Non-std: DATE-TIME or DATE
EXDATE               DATE-TIME-DATE     # Non-std: DATE-TIME or DATE
RDATE                DATE-TIME-PERIOD   # Non-std: DATE-TIME or DATE or PERIOD
TRIGGER              TRIGGER            # Non-std: DURATION or DATE-TIME
DURATION	     DURATION 
QUERY                QUERY
