diff --git a/src/main/java/solutions/fairdata/openrefine/metadata/fdp/VocabularyHelper.java b/src/main/java/solutions/fairdata/openrefine/metadata/fdp/VocabularyHelper.java
index de482d0..ebe7f60 100644
--- a/src/main/java/solutions/fairdata/openrefine/metadata/fdp/VocabularyHelper.java
+++ b/src/main/java/solutions/fairdata/openrefine/metadata/fdp/VocabularyHelper.java
@@ -25,6 +25,8 @@
 import org.eclipse.rdf4j.model.IRI;
 import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
 import org.eclipse.rdf4j.model.vocabulary.DCAT;
+import org.eclipse.rdf4j.model.vocabulary.DCTERMS;
+import org.eclipse.rdf4j.model.vocabulary.FOAF;
 import org.eclipse.rdf4j.model.vocabulary.RDF;
 
 public class VocabularyHelper {
@@ -35,32 +37,32 @@ public class VocabularyHelper {
     public static final IRI TYPE_CATALOG = DCAT.CATALOG;
     public static final IRI TYPE_DATASET = DCAT.DATASET;
     public static final IRI TYPE_DISTRIBUTION = DCAT.DISTRIBUTION;
-    public static final IRI TITLE = vf.createIRI("http://purl.org/dc/terms/title");
-    public static final IRI VERSION = vf.createIRI("http://purl.org/dc/terms/hasVersion");
-    public static final IRI DESCRIPTION = vf.createIRI("http://purl.org/dc/terms/description");
-    public static final IRI LICENSE = vf.createIRI("http://purl.org/dc/terms/license");
-    public static final IRI RIGHTS = vf.createIRI("http://purl.org/dc/terms/accessRights");
-    public static final IRI PUBLISHER = vf.createIRI("http://purl.org/dc/terms/publisher");
-    public static final IRI PUBLISHER_NAME = vf.createIRI("http://xmlns.com/foaf/0.1/name");
-    public static final IRI PARENT = vf.createIRI("http://purl.org/dc/terms/isPartOf");
-    public static final IRI LANGUAGE = vf.createIRI("http://purl.org/dc/terms/language");
+    public static final IRI TITLE = DCTERMS.TITLE;
+    public static final IRI VERSION = DCTERMS.HAS_VERSION;
+    public static final IRI DESCRIPTION = DCTERMS.DESCRIPTION;
+    public static final IRI LICENSE = DCTERMS.LICENSE;
+    public static final IRI RIGHTS = DCTERMS.RIGHTS;
+    public static final IRI PUBLISHER = DCTERMS.PUBLISHER;
+    public static final IRI PUBLISHER_NAME = FOAF.NAME;
+    public static final IRI PARENT = DCTERMS.IS_PART_OF;
+    public static final IRI LANGUAGE = DCTERMS.LANGUAGE;
     // "Repository"
     public static final IRI CATALOG = vf.createIRI("http://www.re3data.org/schema/3-0#dataCatalog");
     // "Catalog"
-    public static final IRI DATASET = vf.createIRI("http://www.w3.org/ns/dcat#dataset");
-    public static final IRI HOMEPAGE = vf.createIRI("http://xmlns.com/foaf/0.1/homepage");
-    public static final IRI THEME_TAXONOMY = vf.createIRI("https://www.w3.org/ns/dcat#themeTaxonomy");
+    public static final IRI DATASET = DCAT.DATASET;
+    public static final IRI HOMEPAGE = FOAF.HOMEPAGE;
+    public static final IRI THEME_TAXONOMY = DCAT.THEME_TAXONOMY;
     // "Dataset"
-    public static final IRI DISTRIBUTION = vf.createIRI("http://www.w3.org/ns/dcat#distribution");
-    public static final IRI CONTACT_POINT = vf.createIRI("http://www.w3.org/ns/dcat#contactPoint");
-    public static final IRI LANDING_PAGE = vf.createIRI("http://www.w3.org/ns/dcat#landingPage");
-    public static final IRI THEME = vf.createIRI("http://www.w3.org/ns/dcat#theme");
-    public static final IRI KEYWORD = vf.createIRI("http://www.w3.org/ns/dcat#keyword");
+    public static final IRI DISTRIBUTION = DCAT.DISTRIBUTION;
+    public static final IRI CONTACT_POINT = DCAT.CONTACT_POINT;
+    public static final IRI LANDING_PAGE = DCAT.LANDING_PAGE;
+    public static final IRI THEME = DCAT.THEME;
+    public static final IRI KEYWORD = DCAT.KEYWORD;
     // "Distribution"
-    public static final IRI FORMAT = vf.createIRI("http://purl.org/dc/terms/format");
-    public static final IRI BYTE_SIZE = vf.createIRI("http://www.w3.org/ns/dcat#byteSize");
-    public static final IRI MEDIA_TYPE = vf.createIRI("http://www.w3.org/ns/dcat#mediaType");
-    public static final IRI DOWNLOAD_URL = vf.createIRI("http://www.w3.org/ns/dcat#downloadUrl");
-    public static final IRI ACCESS_URL = vf.createIRI("http://www.w3.org/ns/dcat#accessUrl");
+    public static final IRI FORMAT = DCTERMS.FORMAT;
+    public static final IRI BYTE_SIZE = DCAT.BYTE_SIZE;
+    public static final IRI MEDIA_TYPE = DCAT.MEDIA_TYPE;
+    public static final IRI DOWNLOAD_URL = DCAT.DOWNLOAD_URL;
+    public static final IRI ACCESS_URL = DCAT.ACCESS_URL;
 
 }