Name	Flags	Card.	Type	Description & Constraints
Availability	ΣTU		Element	Availability data for an {item} Elements defined in Ancestors: id, extension
availableTime	ΣC	0..*	Element	Times the {item} is available + Rule: Cannot include start/end times when selecting all day availability.
daysOfWeek	Σ	0..*	code	mon | tue | wed | thu | fri | sat | sun Binding: Days Of Week (Required)
allDay	ΣC	0..1	boolean	Always available? i.e. 24 hour service
availableStartTime	ΣC	0..1	time	Opening time of day (ignored if allDay = true)
availableEndTime	ΣC	0..1	time	Closing time of day (ignored if allDay = true)
notAvailableTime	Σ	0..*	Element	Not available during this time due to provided reason
description	Σ	0..1	string	Reason presented to the user explaining why time not available
during	Σ	0..1	Period	Service not available during this period
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