HotelAvailCalendar, dates, Room queries, and empty Room Types

For XML developers wishing to request an availability calendar of Room Types, just get the Date Requestor correct, such as:

<AvailRequestSegment Month="07" Year="2013" RoomTypeCode="">

and also the Room Type desired. Such as:

<AvailRequestSegment Month="05" Year="2013" RoomTypeCode="CODE_HERE">.

A RoomTypeCode="QUEEN" would return a Type known as 'QUEEN'.  An empty RoomType code assumes you want all room types for the array.

Note that there is no message to return a set of availability for a ROOM, only for ROOM TYPES. This is intentional, as it's roughly industry practice. For more details on visual ways to enable Guests to plan their stay at a property, see: https://docs.bookingcenter.com/display/MYPMS/APIs+and+Web+Services+Available+From+BookingCenter