PPROP name propertyname object
PPROP assigns a property pair to a Logo name. PPROP takes three inputs: the first, the name with which a property list should be associated; the second, the property name; the third, the property value.
The first input to PPROP must be a word; the second and third inputs can be either a word or a list. PPROP stands for "Put Property."
A property pair consists of a property name and its value.
? PPROP "MUSIC "COMPOSER "STRAVINSKY
? PPROP "MUSIC "COMPOSITION "PETROUCHKA
? PLIST "MUSIC
Result: [COMPOSITION PETROUCHKA COMPOSER STRAVINSKY]