https://w3id.org/saref4ee#optionalSlot
Property 's4ee:optional slot'

rdf:type
owl:DatatypeProperty
rdfs:comment
Indicates whether a slot is optional (if set to TRUE). Otherwise, if a slot is mandatory, SHALL be omitted or set to FALSE. Note: This element applies to every repetition of the slot number.
rdfs:label
optional slot
rdfs:range
xsd:boolean
References

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