diff --git a/ontology/saref4inma.ttl b/ontology/saref4inma.ttl
index 9adf6088d4378a46ca698f28f8d5e315d8a713dc..40381b1f59ea8569b6b5887be457fc80ceb30995 100644
--- a/ontology/saref4inma.ttl
+++ b/ontology/saref4inma.ttl
@@ -5,6 +5,7 @@
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 @prefix vann: <http://purl.org/vocab/vann/> .
+@prefix geo: <http://www.opengis.net/ont/geosparql#> .
 @prefix saref: <https://saref.etsi.org/core/> .
 @prefix s4inma: <https://saref.etsi.org/saref4inma/> .
 @base <https://saref.etsi.org/saref4inma/> .
@@ -317,6 +318,13 @@ s4inma:hasVersion rdf:type owl:DatatypeProperty ;
 #    Classes
 #################################################################
 
+
+geo:SpatialObject a owl:Class ;
+  rdfs:comment "The class spatial-object represents everything that can have a spatial representation. It is superclass of feature and geometry."@en ;
+  rdfs:isDefinedBy <http://www.opengis.net/ont/geosparql> ;
+  rdfs:label "SpatialObject"@en .
+
+  
 ###  http://www.w3.org/2004/02/skos/core#ConceptScheme
 <http://www.w3.org/2004/02/skos/core#ConceptScheme> rdf:type owl:Class ;
                                                     rdfs:comment "SKOS concept scheme can be viewed as an aggregation of one or more SKOS concepts." ;
@@ -335,12 +343,6 @@ s4inma:hasVersion rdf:type owl:DatatypeProperty ;
                                                   rdfs:label "Building space"@en .
 
 
-###  https://saref.etsi.org/saref4bldg/PhysicalObject
-<https://saref.etsi.org/saref4bldg/PhysicalObject> rdf:type owl:Class ;
-                                                   rdfs:comment "Any Object that has a proper space region.  (Definition extracted from DUL ontology)" ;
-                                                   rdfs:label "Physical object"@en .
-
-
 ###  https://saref.etsi.org/saref4inma/ActualMeasurement
 s4inma:ActualMeasurement rdf:type owl:Class ;
                          rdfs:subClassOf saref:Observation ;
@@ -556,8 +558,7 @@ s4inma:MaterialCategory rdf:type owl:Class ;
 
 ###  https://saref.etsi.org/saref4inma/ProductionEquipment
 s4inma:ProductionEquipment rdf:type owl:Class ;
-                           rdfs:subClassOf saref:Device ,
-                                           <https://saref.etsi.org/saref4bldg/PhysicalObject> ,
+                           rdfs:subClassOf saref:Device , geo:SpatialObject ,
                                            [ rdf:type owl:Restriction ;
                                              owl:onProperty saref:hasFunction ;
                                              owl:allValuesFrom s4inma:ProductionEquipmentFunction