6.12. <del> The Track Request Parameters identify properties of the track requested in either the ANNOUNCE or SUSBCRIBE REQUEST control messages.  The peers MUST close the connection if there are duplicates.  The Parameter Value Length field indicates the length of the Parameter Value. </del> <ins> Subscription hints provide a way for a subscriber to indicate, to the publisher, its preferences for receiving objects from a given track. </ins> <del> The format of "Track Request Parameter" is as follows: </del> <ins> Subscription Hints have the following structure: The "HintType" parameter identifies one of the following values: "HintValue" contains "HintValueLength" bytes, which encode attributes as specified by the HintType.  If the HintType does not need extra hint attributes, the HintValueLength is 0, and the HintValue is empty. Future versions of the specification may define more hint types as needed. In the sections below, a publisher's current state of the track is defined by the most recent group and object sequence received (or active in the cache), if available, at the time of request. </ins> 6.12.1. <del> The GROUP SEQUENCE parameter (key 0x00) identifies the group within the track to start delivering objects.  The publisher MUST start delivering the objects from the most recent group, when this parameter is omitted.  This parameter is applicable in SUBSCRIBE REQUEST message. </del> <ins> "Current" subscription hint specifies the start point for object delivery from the beginning of the current group.  Current hint type defines no further hint attributes. </ins> 6.12.2. <del> The OBJECT SEQUENCE parameter (key 0x01) identifies the object with the track to start delivering objects.  The "GROUP SEQUENCE" parameter MUST be set to identify the group under which to start delivery.  The publisher MUST start delivering from the beginning of the selected group when this parameter is omitted.  This parameter is applicable in SUBSCRIBE REQUEST message. </del> <ins> "Now" subscription hint specifies the start point for object delivery from the most recent object of the current group.  Now hint type defines no further hint attributes. </ins> 6.12.3. <ins> "RelativeStartPrevious" subscription hint specifies the start point for object delivery from an earlier group relative to the current group.  The "GroupCount" hint attribute specifies the number of groups to go back from the current group to determine the start point. 6.12.4. "RelativeStartNext" subscription hint specifies the start point for object delivery to a future group relative to the current group.  The "GroupCount" hint attribute specifies the number of groups to wait on before delivering the objects. 6.12.5. The "AbsoluteStart" subscription hint allows subscribers to specify an absolute point in the track to start delivering objects, as indicated by the "TrackOffset" hint attribute. The structure for AbsoluteStart hint value is as follows: TrackOffset: Identifies the group and the object sequence value within the track as the start point for the delivery.  TrackOffset is defined as below. "ObjectSequence" set to 0x0 implies until the end of the group identified in "GroupSequence". 6.12.6. The "AbsoluteInterval" subscription hint allows subscribers to request for range of objects by specifying values pertaining to start and end group/object sequences. The AbsoluteInterval hint value has the following structure: The end track offset of the range is exclusive. 6.13. The Track Request Parameters identify properties of the track requested in either the ANNOUNCE or SUSBCRIBE REQUEST control messages.  The peers MUST close the connection if there are duplicates.  The Parameter Value Length field indicates the length of the Parameter Value. The format of "Track Request Parameter" is as follows: 6.13.1. </ins> AUTHORIZATION INFO parameter (key 0x02) identifies track's authorization information.  This parameter is populated for cases where the authorization is required at the track level.  This