# 1999/3/29

#=======#
# event #
#=======#

# An event is the occurrence of an action.
# Since the essence of action is a change of attribute,
# an event can be characterized as

	at space=s,time=t,view=v
	entity:1,... do action:2 entity:3 = event:4
	event:4 changes entity:3 \
		from attribute:6 = initial:7, ... \
		to attribute:6 = final:8, ...
	event:4 changes entity:1 \
		from attribute:10 = initial:11, ... \
		to attribute:10 = final:12, ...

# entity:1 is the subject(s) of the action:2.
# action:2 is the action.
# entity:3 is the aobject(s) of the action:2;
# entity:3 and entity:1
#	are the eobject(s) of the event event:4,
#	which have their attribute(s) changed.
# initial:7 is the initial value of attribute:6,
#	before the action begins.
# final:8 is the final value of attribute:6,
#	after the action completes.
# s,t is the space/time where/when the action occurs.
# v is the view which defines all the concepts.

# s,t are also attributes changed by event:4.
# Most actions are considered to begin at s,t
	from space=s,time=t
# Some actions are considered to end at s,t
	to space=s,time=t


#===========#
# causality #
#===========#

# A phenomenon is a set of events related by cause and effect.

	phenomenon is all event:1 and event:2 and ...

	event:i causes event:j
	...

