diff --git a/display-ontology.ttl b/display-ontology.ttl
index 3ca49ae..a99d624 100644
--- a/display-ontology.ttl
+++ b/display-ontology.ttl
@@ -96,12 +96,33 @@ display:faces rdf:type owl:ObjectProperty ;
 
 
 ###  https://ouvroir.umontreal.ca/onto/display#hasConceptualRelationWith
-display:hasConceptualRelationWith rdf:type owl:ObjectProperty ,
-                                           owl:SymmetricProperty ;
+display:hasConceptualRelationWith rdf:type owl:ObjectProperty ;
                                   rdfs:comment "Conceptual relation between exhibits (non topological). Not to be stated explicitly."@en ;
                                   vs:term_status "unstable" .
 
 
+###  https://ouvroir.umontreal.ca/onto/display#hasExhibit
+display:hasExhibit rdf:type owl:ObjectProperty ;
+                   rdfs:subPropertyOf owl:topObjectProperty ;
+                   rdfs:domain display:ExhibitionSpace ;
+                   rdfs:range display:Exhibit ;
+                   owl:propertyChainAxiom ( bot:containsZone
+                                            display:hasExhibit
+                                          ) ;
+                   rdfs:comment "Relation entre un espace expographique et un expôt contenu dans l'espace expographique."@fr ;
+                   vs:term_status "unstable" .
+
+
+###  https://ouvroir.umontreal.ca/onto/display#hasExhibitionSpace
+display:hasExhibitionSpace rdf:type owl:ObjectProperty ;
+                           rdfs:subPropertyOf bot:hasSpace ;
+                           rdfs:domain bot:Zone ;
+                           rdfs:range display:ExhibitionSpace ;
+                           rdfs:comment "Relation to exhibition spaces contained in a zone. The typical domains of display:hasExhibitionSpace are instances of bot:Space or display:ExihibitionSpace. A space is often divided into two or more exhibition spaces."@en .
+
+
+###  https://ouvroir.umontreal.ca/onto/display#hasInterface
+
 ###  https://ouvroir.umontreal.ca/onto/display#hasTopologicalRelationWith
 display:hasTopologicalRelationWith rdf:type owl:ObjectProperty ;
                                    rdfs:domain display:Exhibit ;
@@ -330,6 +351,7 @@ display:HangingInterface rdf:type owl:Class ;
 display:InformativeExhibit rdf:type owl:Class ;
                            rdfs:subClassOf display:Exhibit ;
                            rdfs:comment "Expôt fournissant de l’information. Exemple : cartel."@fr ;
+                           rdfs:isDefinedBy :display ;
                            owl:deprecated "true"^^xsd:boolean ;
                            vs:term_status "unstable" .