| BlockDescriptions | Collection of free form information about the inventory block. |
| Contacts | A collection of contacts. |
| DestinationSystemCodes | A collection of destination system codes. These are systems for which this inventory block is targeted.A collection of DestinationSystemCode. |
| Guarantee | The guarantee information to hold a reservationThe guarantee information to hold a reservation |
| HotelRef | This is used to identify the hotel to which the block applies. |
| InvBlockDates | This is used to indicate the date or date range applicable to this inventory block. |
 MarketCode | This is user specific information used for tracking and market segmentation reporting. |
| MethodInfo | This is used to indicate the reservation and billing methods for a single inventory block. |
| RoomTypes | This allows for multiple room types to be defined within an inventory block. |
| TaxInformation | Tax information for the entire group. |
| BookingStatus | Provides information as to whether the rooms are available for booking. |
| InvBlockCode | This is the group id typically used to make a booking in a central reservation system. |
| InvBlockCompanyID | This is used to identify the company or corporation associated with the inventory block, it is not a direct bill number. |
| InvBlockGroupingCode | This code identifies the inventory group that contains multiple blocks. This allows for nested blocks. |
| InvBlockLongName | This is the full name of the Inventory Block. |
| InvBlockName | This is the short name of the Inventory Block. |
| InvBlockStatusCode | This defines the status of the block. Refer to OpenTravel Code List Inventory Block Status (IBS). |
| InvBlockTypeCode | Describes the type of inventory the block is being created for. Refer to OpenTravel Code List Inventory Block Type (IBT). |
| OpportunityID | This is the identifier (i.e. opportunity) that refers back to the same block in the requesting system (e.g. a sales system or a wholesaler). |
| PMS_InvBlockID | This is used as a cross reference to the property management system (e.g. PMS Group Master Number). |
| QuoteID | This identifies a specific quote for an inventory block. |
| RestrictedBookingCodeList | This is who is allowed to book against the block. Refer to OpenTravel Code List Unique ID Type (UIT). If this attribute is not used, there are no restrictions to the booking access.List of OpenTravel Codes. |
| RestrictedViewingCodeList | This is who is allowed to view the block. Refer to OpenTravel Code List Unique ID Type (UIT). If this attribute is not used, there are no restrictions to the viewing access.List of OpenTravel Codes. |
| TransactionAction | Used to specify the action to be taken on the block (e.g., create, book, modify, cancel).To specify the type of action requested when more than one function could be handled by the message. |
| TransactionDetail | This provides the specific action to be taken on the block according to the TransactionAction attribute. |