entity
physical
abstract
quantity
attribute
set or class
relation
single valued relation
function
function quantity
unary constant functionquantity
ampere
candela
newton
pascal
joule
watt
volt
farad
ohm
siemens
weber
tesla
henry
lumen
lux
gray
sievert
electron volt
pound force
calorie
british thermal unit
unary function
binary function
ternary function
quaternary function
continuous function
assignment fn
list fn
greatest common divisor fn
least common multiple fn
valence
unique identifier
age
width
distance
altitude
depth
monetary value
date
mother
father
total valued relation
partial valued relation
binary relation
probability relation
spatial relation
temporal relation
ternary relation
quaternary relation
quintary relation
list
predicate
variable arity relation
relation extended to quantities
proposition
graph
graph element