diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index 27b103a2d4473699fe053eb84a4812df9972b2ed..3c4ed38c60fef01b95908cd911badcd653f74a1b 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -21,7 +21,7 @@
                                                           <http://www.maxime-lefrancois.info/> ;
 				      dcterms:publisher <https://www.etsi.org/> ;
 				      dcterms:license <https://forge.etsi.org/etsi-software-license> ;
-                                      dcterms:source <https://forge.etsi.org/rep/SAREF/saref4ehaw/> ;
+                                      dcterms:source <https://saref.etsi.org/sources/saref4ehaw/> ;
                                       owl:versionIRI <https://saref.etsi.org/saref4ehaw/v1.1.1/> ;
                                       owl:versionInfo "v1.1.1" ;
                                       vann:preferredNamespacePrefix "s4ehaw" ;
@@ -46,8 +46,6 @@ For embedded semantic analytics purposes, SAREF4EHAW shall behas been designed u
 #    Annotation properties
 #################################################################
 
-xsd:duration a owl:Datatype .
-
 
 ###  http://purl.org/dc/terms/contributor
 dcterms:contributor rdf:type owl:AnnotationProperty .