All Schema files in the OTA specification are made available according to the terms defined by the OTA License Agreement at http://www.opentravel.org/ota_downloads_form.cfm This is a generic acknowledgement response message that may be used with various OTA request messages. This simply acknowledges that the request message was received. The presence of the empty Successs element explicitly indicates that the OTA versioned message succeeded. Used in conjunction with the Success element to define one or more business errors. Errors is returned if the request was unable to be processed. Corresponds to the MessageID used in OTA_HotelRFP_RQ.xsd and OTA_HotelRFP_NotifRQ.xsd. This is a UniqueID that is associated with the request message. A collection of RFP_ID. Corresponds to the RFP_ID used in OTA_HotelRFP_RQ.xsd and OTA_HotelRFP_NotifRQ.xsd. This is a UniqueID that is associated with an individual RFP. A collection of SiteID. Corresponds to the SiteID used in OTA_HotelRFP_RQ.xsd and OTA_HotelRFP_NotifRQ.xsd. This is used to identify a particular Site in the RFP.