9 Scheduling module

9.7 Pulse maps

In some applications, meaningful repetitions, called "pulses", occur along one or more axes. Any schedule (that is, any evsched, wand, or baton) can serve as a pulse map for any other schedule, or for any event, modscope, proscope, evgrp, modgrp, or progrp.

NOTE 290 For example, a felt beat ("tactus") in music, a change of frame in video, or a row or column of rectangles in a grid.

Different pulses may have different significance. The significance of a pulse is determined by the application's interpretation of the object of that pulse's event.

NOTE 291 In music, a pulse that represented a stressed beat would have a different object than a pulse that represented an unstressed beat. Since the object of an empty event is considered to be the event itself, different kinds of stresses in music might be represented by different element types, all of which are clients of the event element form, or by a single client element type with different values for one of its attributes.

The attribute form pulse maps (pulsemap) consists of the pulsemap attribute, which specifies schedules that establish the pulses intended to provide pulsing contexts for the event, modscope, or proscope that is the referring element or for the events, modscopes, or proscopes scheduled by the referring element.

                          <!-- Pulsemaps -->
<![ %pulsemap; [
<!attlist
-- pulsemap --    -- Pulse Maps --
                  -- Clause: 9.7 --
   (baton,event,evgrp,evsched,modgrp,modscope,progrp,proscope,wand)

   pulsemap       -- Pulse Maps --
                  -- Schedules to be used as pulse maps. --
      CDATA       -- Reference --
                  -- Reftype: (baton|evsched|wand)* --
                  -- Constraint: Pulse maps must be in same FCS as
                     referrer. --
      #IMPLIED    -- Default: none --
>
<!entity % sched "INCLUDE">
]]><!-- pulsemap -->

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