QCRs vs functional property

Question

I have question based on the topic:

SOF - Einstein puzzle in OWL

In the owl, all cardinality restrictions are based on functional and inverse functional pro

Answer 1

These three axioms

1. Man SubClassOf drinks some Beverage
   
   • Man ⊑ ∃drinks.Beverage
2. drinks : Functional, InverseFunctional
   
   • Thing ⊑ ≤1 drinks.Thing
   • Thing ⊑ ≤1 drinks^-1.Thing

are not logically equivalent to

3. Man SubClassOf drinks exactly 1 Beverage
   • Man ⊑ =1 drinks.Beverage

Here's is some data that's inconsistent in the first model, but not in the second:

m1 rdf:type Man .
d1 rdf:type Beverage .
d2 rdf:type (not Beverage) .
m1 drinks d1, d2 .

"The property p is functional" is an equivalent axiom to "Thing p max 1 Thing."