Has modifier leaf node

@prefix omop: <https://w3id.org/omop/ontology/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix owlready: <http://www.lesfleursdunormal.fr/static/_downloads/owlready_ontology.owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

omop:has_modifier a owl:FunctionalProperty,
        owl:ObjectProperty ;
    rdfs:label "Has modifier"^^xsd:string ;
    owlready:python_name "modifier"^^xsd:string ;
    rdfs:comment """For Procedure Occurrence: The modifiers are intended to give additional information about the procedure but as of now the vocabulary is under review.
It is up to the ETL to choose how to map modifiers if they exist in source data. These concepts are typically distinguished by 'Modifier' concept classes (e.g., 'CPT4 Modifier' as part of the 'CPT4' vocabulary). If there is more than one modifier on a record, one should be chosen that pertains to the procedure rather than provider. If not available, set to 0. [Accepted Concepts](https://athena.ohdsi.org/search-terms/terms?conceptClass=CPT4+Modifier&conceptClass=HCPCS+Modifier&vocabulary=CPT4&vocabulary=HCPCS&standardConcept=Standard&page=1&pageSize=15&query=)."""@en ;
    rdfs:domain omop:ProcedureOccurrence ;
    rdfs:range omop:Concept ;
    omop:omop_cdm_name "procedure_occurrence.modifier_concept_id#106 AS Concept"^^xsd:string .