geosparql:hasVolume leaf node

@prefix : <http://www.opengis.net/ont/geosparql#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix spec11: <http://www.opengis.net/spec/geosparql/1.1/specification.html#> .

:hasVolume a rdf:Property,
        owl:ObjectProperty ;
    rdfs:domain :SpatialObject ;
    rdfs:isDefinedBy :,
        <http://www.opengis.net/spec/geosparql/1.1/req/geometry-extension/spatial-object-properties> ;
    rdfs:subPropertyOf :hasSize ;
    skos:definition "The volume of a three-dimensional Spatial Object."@en ;
    skos:example spec11:B.1.2.2 ;
    skos:prefLabel "has volume"@en .