dli:required leaf node

@prefix dli: <https://standards.lifeengine.io/v1/Vocabulary/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix pot: <https://standards.oftrust.net/v1/Vocabulary/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix vs: <http://www.w3.org/2003/06/sw-vocab-status/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

dli:required a rdf:Property ;
    rdfs:domain dli:SupportedAttribute ;
    rdfs:isDefinedBy pot: ;
    rdfs:range xsd:boolean ;
    xsd:restriction [ xsd:base "xsd:string" ;
            xsd:maxLength 500 ] ;
    owl:versionInfo "DRAFT" ;
    vs:term_status "unstable" ;
    dli:readonly false ;
    dli:required false .