General system context and registration identification refinements specific to this PlacementRequest. Placement service identification refinement details specific to this PlacementRequest. Private ADM data that shall be returned (echoed back) by the ADS in the PlacementResponse message. The ADM allows/accepts updates for the PlacementRequest message. Placement request message element. Placement response message element. Reference to the original PlacementRequest message. Message command. For example, "replace", "cancel, etc. Placement update notification message element. Placement update acknowledgement message element. Placement status notification message element. Placement status acknoweldgement message element. List ADM offered placement services request message element. List of placement service descriptions defined by a system context and a list of services within that context for which placement decisions may be provided. List ADM offered placement services response message element. Reference to a previous, original ADSRegistrationRequest message. If this attribute is ommitted then all registrations may be returned. Request active ADS registration list message element. List of active ADS registrations. Response containing active ADS registration list message element. List of placement services (via ServiceDescriptions) for which the ADS desires to provide placement decisions. ADS registration request message element. Registration response message element. Reference to a previous ADSRegistrationRequest message. ADS deregister request message element. Deregister response message element. Reference to a previously accepted ADSRegistrationRequest message. Deregistration notification message element. Deregistration acknoweledgement message element. End date and time for a group of events. Start date and time for a group of events. Event type name identifier. Placement messages local service element cross-reference linkage identifier. Placement action identifier. Placement opportunities expected count relative to the content. Placement opportunity number/identifier relative to the content. Placement opportunity type identifier. Subdivision position identifier. Common attributes required for all events. Event type identifier. Time event occurred. Origin identifier. Origin identifier. The ADS origin/target logical service identifier. Message reference. Start and end date time for the events contained within this element. A start date and time for all event elements contained within this element. A end date and time for all event elements contained within this element. Common attributes required by all placement opportunity binding types. Placement opportunity type identification. Examples are: pre-roll, post-roll, interstitial, pause, etc. Placement opportunity identification relative/within the content. Total expected placement opportunity count. Event elements base type. Normal play time (NPT) element base type. Positive or negative decimal value (e.g. -2.0 for 2x rewind, etc.). Placement count base type. Common elements in PlacementResponse and PlacementUpdateNotification. Reference to the programming/entertainment content. Copy of the element if received in the PlacementRequest message. PlacementStatusNotification only registration is supported. Omission indicates PlacementStatusNotification only registration is not supported. ADM supported options. Data that must be returned if sent. Channel identification. Current client time. Client endpoint identification. List of addressable (targeting) criteria. Container for client addressability/targeting specifics and refinements. Content provider name/identification. Content provider name and/or identification. Container for ad spot list used in a placement rotation. Desired (ideal) run-time length. Desired (ideal) placement count. Expiration date and time when the container becomes inactive. Ommision implies never. Commencement date and time when the container becomes active. Ommision implies immediate. NPT specific to the core:Content element above. Entertainment content identification. NPT scoped by (relative to) an Entertainment element. The Entertaiment element applies to all events in the choice sequence. The Entertainment element shall not appear in any child named event element. Events all relative to the static Entertainment element declaration. Container for named event element sequence. Spice event identifier. Linear avail placement opportunity specific information. Maximum run-time length. Maximum placement count. Minimum run-time length. Minimum placement count. Network identification. Normal play time. Generic opportunity information bridge. Ad type fulfillment advisory. Maximum duration for the sum of related returned placements. Minimum duration for the sum of related returned placements. Desired (ideal) duration for the sum of related returned placements. Required duration for the sum of related returned placements. Maximum placement count for the sum of related returned placements. Minimum placement count for the sum of related returned placements. Desired (ideal) placement count for the sum of related returned placements. Required specific placement count for the sum of related returned placements. Placement opportunity constraints via a combination of guidance and/or requirements. Content specifier. Container for content list used in a placement rotation. Unique identifier. Specified placement behavior. Reference to a PlacementControl element. Placement position within this placement decision. Zero indicates unspecified. Describes an individual content placement decision including an applicible content binding. Specific run-time length for the content decision. The placement engine shall pad or cut to meet this exact time. Placement constraints via a combination of guidance and/or requirements. Details about current ad content, if known. Unique identifier. Planned/recommended action. Position within the placement opportunity. Zero indicates unknown. Placement opportunity subdivision. Individual constraints via a combination of guidance and/or requirements. Specific placement count. Anticipated/calculated opportunity start date and time based on the entertainment content and the client time. The PlacementConstraints element applies to the entire PlacementDecision which may be subdivided via the list of Placement elements. Individual placements may be further controlled by their own local PlacementConstraints element. Unique identifier. Reference associating this PlacementDecision with a PlacementOpportunity element. Reference to a Service element contained locally in the PlacementResponse message. Individual placement decision description groups. Placement decision owner identifier. The OpportunityConstraints element applies to the entire PlacementOpportunity which may be subdivided via the list of PlacementControl elements. Individual PlacementControl elements may further specify their own local OpportunityConstraints element which in turn has a more limited and specific scope. Unique identifier. Reference to a specific service registration provided via the ADSRegistrationReguest message's Service element id attribute. Reference to a Service element contained locally in the PlacementRequest message. Individual placement opportunity descriptions. Placement specific event. These elements apply to all events below. If the element appears here then it should not appear in any named event anywhere below. Information reduction by using static entertainment asset and/or static spot event groupings. Events all relative to the static Spot element declaration. ADM identity origin identifier for all events contained within this element. Origin identifier for all events contained within this element. ADS identity origin identifier for all events contained within this element. Container for event element groups. Product identification. Examples: MOD, VOD, FOD, etc. Provider avail identifier. Scope fullfillment advisory. For example: National, Regional, Local, etc. Service scope. Service identifier. Overall placement course of action. Examples: preload, default, interactive, etc. Placement opportunity type identification. Examples are: pre-roll, post-roll, interstitial, pause, etc. Information for identifying a placement decision maker. Associated service system parameter descripiton for which an ADS provides placement decisions. Description of placement services for which an ADS provides placement decisions. Service specification defined by a system context and a list of services within that context. Service group identification. Session identification. Event organized and identified based on some determined criteria. NPT specific to the core:Content element above. Ad spot identification. NPT scoped by (relative to) a declared Spot element. The Spot element applies to all events in the Events element and the Spot element shall not appear in any named event within the Events element Events all relative to the static Spot element declaration. General system information. Generic event container. Addressable/target criteria element. Name of key in key/value pair. Terminal endpoint type identification. Examples are: IP, MAC, etc. Client/subscriber/target endpoint identification. Transport specfic. Event generation source. Examples include: remote, software, etc. Client/end-user/on-screen event. Window start date and time. Window end date and time. Placement opportunity scheduled time range. Zone identifier.