(deftemplate MAIN::person
    (slot name)
    (slot age)
    (multislot hobby)
    (slot town)
    (slot sex))

(person (name "Jane")
        (age 25)
        (hobby fashion gardening)
        (town montrose)
        (sex female))

(deffacts hobby_types "Hobby categories"
    (hobby_type gardening active)
    (hobby_type swinging active)
    (hobby_type reading inactive)
    (hobby_type fashion inactive)
)

(defrule compatible_hobbies
    (opposite_sex ?name1 ?name2)
    (person (name ?name1) (hobby ?hobby1))
    (person (name ?name2) (hobby ?hobby2))
    (hobby_type ?hobby1 ?type)
    (hobby_type ?hobby2 ?type)
    =>
    (assert (hobbies_match ?name1 ?name2))
)