diff --git a/prepare_work_data.py b/prepare_work_data.py
index 6b546ed4c65d8e3e9c2fbed1d84b0f0e3ad4a8b5..c88dac581017b364113cf25e5aa1982f94a551a6 100644
--- a/prepare_work_data.py
+++ b/prepare_work_data.py
@@ -155,13 +155,8 @@ def finalize_export_file(export_file):
             "@prefix sys: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/> .",
             """
             @prefix sys: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/> .
-            @prefix sys-class: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/class/> .
-            @prefix sys-property: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/property/> .
-            @prefix sys-relation: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/relation/> .
             @prefix sys-Event: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/Event#> .
-            @prefix sys-event: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/eventObjectProperty#> .
             @prefix sys-State_Property: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/State_Property#> .
-            @prefix sys-stateProperty: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/statePropertyObjectProperty#> .
             @prefix sys-abstract_thing: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/abstract_thing#> .
             @prefix sys-action_verb: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/action_verb#> .
             @prefix sys-agent: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/agent#> .
@@ -169,6 +164,11 @@ def finalize_export_file(export_file):
             @prefix sys-component: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/component#> .
             @prefix sys-message: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/message#> .
             @prefix sys-place: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/place#> .
+            @prefix owl: <http://www.w3.org/2002/07/owl#> .
+            @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+            @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+            @prefix sys-relation: <https://unsel.tetras-libre.fr/tenet/frame/system-ontology/relation/> .
+            @prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
             """)
         file.write(x)
         
@@ -208,15 +208,21 @@ def run(corpus, source_ref, target_ref):
 #==============================================================================
 
 if __name__ == '__main__':
-    target_ref = "system"
+    
+    # -- Data for Qivalio POC
     #target_ref = "environment"
-    run(req_100, 'R100f', target_ref) 
-    run(req_200, 'R200f', target_ref)
-    run(req_300, 'R300f', target_ref) 
-    run(req_1100, 'R1100f', target_ref) 
-    run(corpus_40, 'Corpus-CCTP-40f', target_ref)
+    target_ref = "system"
+    run(corpus_PEV, 'Corpus-PEV', target_ref)
+    
+    
+    # Data for Master
+    #target_ref = "system"
+    #run(req_100, 'R100f', target_ref) 
+#    run(req_200, 'R200f', target_ref)
+#    run(req_300, 'R300f', target_ref) 
+#    run(req_1100, 'R1100f', target_ref) 
+#    run(corpus_40, 'Corpus-CCTP-40f', target_ref)
     #run(corpus_ERTMS, 'Corpus-ERTMS', target_ref)
-    #run(corpus_PEV, 'Corpus-PEV', target_ref)