some ideas for data format and so on.

pddl-domain.lisp

(define (domain n64-zelda-majora)

    (:requirements :typing :fluents :durative-actions)

    (:types
        item cycevt location object
    )

    (:constants
        bow ocarina powder-keg goron-mask eponas-song song-of-time - item
        clock-town-south milk-road romani-ranch termina-field - location
        milk-road-unblocked recruited-by-romani saved-the-ranch - cycevt
    )

    (:functions
        (ammo-amount ?item - item)
        (cycle-event ?evt - cycevt)
        (game-clock)
    )

    (:predicates
        (at ?obj - object ?loc - location)
        (have-item ?item - item)
    )

    (:durative-action play-song-of-time
        :parameters 
            (?player)

        :duration
            (= ?duration 30)

        :condition
            (at start (and (have-item ocarina) (have-item song-of-time)))

        :effect
            (at end (and 
                (= (game-clock) (* 6 60))
                (at ?player clock-town-south)
                (forall (?i - item)   (= (ammo-amount ?i) 0))
                (forall (?e - cycevt) (not (cycle-event ?e)))
            ))
    )

    (:durative-action open-milk-road
        :parameters 
            (?player)

        :duration 
            (= ?duration 5)

        :condition
            (at start (and
                (at ?player milk-road)
                (have-item powder-keg)
                (have-item goron-mask)
                (> (ammo-amount powder-keg) 0)
                (< (game-clock) (* 54 60))
            ))

        :effect
            (and
                (at start (decrease (ammo-amount powder-keg) 1))
                (at end (cycle-event milk-road-unblocked))
            )
    )

    (:durative-action befriend-romani
        :parameters
            (?player)

        :duration 
            (= ?duration 60)

        :condition
            (at start (and
                (at ?player romani-ranch)
                (have-item bow)
                (have-item ocarina)
                (> (game-clock) (* 6 60))
                (< (game-clock) (* 18 60))
            ))

        :effect 
            (at end (and
                (have-item eponas-song)
                (cycle-event recruited-by-romani)
            ))
    )

    (:durative-action defend-ranch-from-aliens
        :parameters 
            (?player)

        :duration 
            (= ?duration (* 3 60))
            
        :condition
            (and
                (at start (cycle-event recruited-by-romani))
                (at start (at ?player romani-ranch))
                (at start (= (game-clock) (* 26 60)))
                (over all (at ?player romani-ranch))
            )
     
        :effect
            (at end (and
                (= (game-clock) (* 29.5 60))
                (cycle-event saved-the-ranch)
            ))
    )
    
    (:durative-action defend-milk-from-gormans
        :parameters 
            (?player)
        
        :duration 
            (= ?duration (* 3 60))
        
        :condition
            (at start (and 
                (cycle-event saved-the-ranch)
                (= (game-clock) (* 42 60))
                (at ?player romani-ranch)
            ))
     
        :effect
            (at end (and
                (have-item romanis-mask)
                (= (game-clock) (* 45 60))
                (at ?player termina-field)
            ))
    )
)

spoon-sketch.xml

<!DOCTYPE SPOON>
<!--speedrun planning/optimizing object notation-->
<game>

 <info>
  <title>Legend of Zelda, The: Majora's Mask</title>
  <console>Nintendo 64</console>
 </info>

 <map>
  <!--
  todo...
   notes:
    - for majora's mask, have a base graph without any extra paths opened
    - edges can be added by events (like blowing up the ranch boulder)
    - edges can be removed by events (like playing song of time)
    - have some sort of <edge type="glitch">
  -->
 </map>

<!-- loc time inv temp clear -->

 <event>
  <name>Play the Song of Time</name>
  <req type="inv">Ocarina</req>
  <outcome type="time">6</outcome>
  <outcome type="loc">South Clock Town</outcome>
  <outcome type="inv" value="0"><!--all items--></outcome>
  <outcome type="clear">temp</outcome>
 </event>

 <event>
  <name>Open Milk Road</name>
  <req type="loc">Milk Road</req>
  <req type="inv">Goron Mask</req>
  <req type="inv" value="1">Powder Keg</req>
  <outcome type="path"><from>Milk Road</from><to>Romani Ranch</to></outcome>
 </event>

 <event>
  <name>Befriend Romani</name>
  <req type="loc">Romani Ranch</req>
  <req type="time">(6,18)</req>
  <req type="inv">Bow</req>
  <req type="inv">Ocarina</req>
  <outcome type="inv">Epona's Song</outcome>
  <outcome type="temp">can-save-ranch</outcome>
 </event>

 <event>
  <name>Save the ranch</name>
  <req type="temp">can-save-ranch</req>
  <req type="loc">Romani Ranch</req>
  <req type="time">26</req>
  <req type="inv">Epona's Song</req>
  <req type="inv">Bow</req>
  <outcome type="inv" value="milk">Bottle3</outcome>
  <outcome type="time">29.5</outcome>
  <outcome type="temp">saved-the-ranch</outcome>
 </event>

 <event>
  <name>Cremia's milk delivery</name>
  <req type="temp">saved-the-ranch</req>
  <req type="loc">Romani Ranch</req>
  <req type="time">42</req>
  <req type="inv">Bow</req>
  <outcome type="inv">Romani's Mask</outcome>
  <outcome type="time">45</outcome>
 </event>

</game>