diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index 8a0b339975b7589169f5cef707f61d5523d1eeea..e95a6f0bd7bf28357263e12e904368f52200a2c5 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -1,13 +1,12 @@
 @prefix owl: <http://www.w3.org/2002/07/owl#> .
 @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
-@prefix xml: <http://www.w3.org/XML/1998/namespace> .
 @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
 @prefix foaf: <http://xmlns.com/foaf/0.1/> .
 @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
 @prefix vann: <http://purl.org/vocab/vann/> .
 @prefix voaf: <http://purl.org/vocommons/voaf#> .
 @prefix saref: <https://saref.etsi.org/saref/core/> .
-@prefix s4ehaw: <https://saref.etsi.org/core/v3.1.1/> .
+@prefix s4ehaw: <https://saref.etsi.org/saref4ehaw/> .
 @prefix s4envi: <https://saref.etsi.org/saref4envi/> .
 @prefix s4wear: <https://saref.etsi.org/saref4wear/> .
 @prefix dcterms: <http://purl.org/dc/terms/> .
@@ -16,19 +15,19 @@
 <https://saref.etsi.org/saref4ehaw/> rdf:type owl:Ontology ;
                                       owl:imports <https://saref.etsi.org/core/v3.1.1/> ;
 				      dcterms:creator <http://www-public.imtbs-tsp.eu/~girodgen/> ;
-                                      dcterms:contributor <http://www-public.imtbs-tsp.eu/~girodgen/> ,
-	                                                  <https://www.linkedin.com/in/lina-nachabe-2b292457/> ,
+                                      dcterms:contributor <https://www.linkedin.com/in/lina-nachabe-2b292457/> ,
 						          <https://research.utwente.nl/en/persons/jo%C3%A3o-luiz-moreira> ,
                                                           <https://pdi.fbk.eu/people/profile/dragoni> ,
                                                           <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/> ;
+                                      owl:versionIRI <https://saref.etsi.org/saref4ehaw/v1.1.1/> ;
                                       owl:versionInfo "v1.1.1" ;
                                       vann:preferredNamespacePrefix "s4ehaw" ;
                                       vann:preferredNamespaceUri "https://saref.etsi.org/saref4ehaw/" ;
                                       dcterms:issued "2020-02-01"^^xsd:date ;
-				      dcterms:modified "2020-02-01"^^xsd:date ;
+				      dcterms:modified "2020-05-01"^^xsd:date ;
                                       dcterms:title "SAREF4EHAW: an extension of SAREF for eHealth Ageing Well domain"@en ;
                                       dcterms:description """The objective of SAREF4EHAW is to extend SAREF ontology for the eHealth/Ageing-well (EHAW) vertical. Clause 4.1 of the present document shortly introduces a high level view of the envisioned SAREF4EHAW semantic model and modular ontology, with the retained concepts (i.e. classes) and their relations. 
 SAREF4EHAW extension has been specified and formalised by investigating EHAW domain related resources, as reported in ETSI TR 103 509, such as: potential stakeholders, standardization initiatives, alliances/associations, European projects, EC directives, existing ontologies, and data repositories. Therefore, SAREF4EHAW modular ontology shall both: