diff --git a/src/main/resources/firstLevel.ucls b/src/main/resources/firstLevel.ucls
new file mode 100644
index 0000000..dc6d02a
--- /dev/null
+++ b/src/main/resources/firstLevel.ucls
@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<class-diagram version="1.1.14" icons="false" automaticImage="PNG" always-add-relationships="true" 
+  generalizations="true" realizations="true" associations="true" dependencies="true" nesting-relationships="true" 
+  router="FAN">  
+  <interface id="1" language="java" name="org.gcube.informationsystem.model.entity.resource.cidoc.E7_Activity" 
+    project="parthenos-entities" 
+    file="/parthenos-entities/src/main/java/org/gcube/informationsystem/model/entity/resource/cidoc/E7_Activity.java" 
+    binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="77" y="344"/>    
+    <display autosize="true" stereotype="false" package="false" initial-value="false" signature="false" 
+      sort-features="false" accessors="true" visibility="false">      
+      <attributes public="false" package="false" protected="false" private="false" static="false"/>      
+      <operations public="false" package="false" protected="false" private="false" static="false"/>    
+    </display>  
+  </interface>  
+  <interface id="2" language="java" 
+    name="org.gcube.informationsystem.model.entity.resource.cidoc.E29_Design_or_Procedure" project="parthenos-entities" 
+    file="/parthenos-entities/src/main/java/org/gcube/informationsystem/model/entity/resource/cidoc/E29_Design_or_Procedure.java" 
+    binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="609" y="350"/>    
+    <display autosize="true" stereotype="false" package="false" initial-value="false" signature="false" 
+      sort-features="false" accessors="true" visibility="false">      
+      <attributes public="false" package="false" protected="false" private="false" static="false"/>      
+      <operations public="false" package="false" protected="false" private="false" static="false"/>    
+    </display>  
+  </interface>  
+  <interface id="3" language="java" name="org.gcube.informationsystem.model.entity.resource.cidoc.E39_Actor" 
+    project="parthenos-entities" 
+    file="/parthenos-entities/src/main/java/org/gcube/informationsystem/model/entity/resource/cidoc/E39_Actor.java" 
+    binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="453" y="348"/>    
+    <display autosize="true" stereotype="false" package="false" initial-value="false" signature="false" 
+      sort-features="false" accessors="true" visibility="false">      
+      <attributes public="false" package="false" protected="false" private="false" static="false"/>      
+      <operations public="false" package="false" protected="false" private="false" static="false"/>    
+    </display>  
+  </interface>  
+  <interface id="4" language="java" name="org.gcube.informationsystem.model.entity.resource.cidoc.E55_Type" 
+    project="parthenos-entities" 
+    file="/parthenos-entities/src/main/java/org/gcube/informationsystem/model/entity/resource/cidoc/E55_Type.java" 
+    binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="203" y="345"/>    
+    <display autosize="true" stereotype="false" package="false" initial-value="false" signature="false" 
+      sort-features="false" accessors="true" visibility="false">      
+      <attributes public="false" package="false" protected="false" private="false" static="false"/>      
+      <operations public="false" package="false" protected="false" private="false" static="false"/>    
+    </display>  
+  </interface>  
+  <interface id="5" language="java" name="org.gcube.informationsystem.model.entity.resource.cidoc.E70_Thing" 
+    project="parthenos-entities" 
+    file="/parthenos-entities/src/main/java/org/gcube/informationsystem/model/entity/resource/cidoc/E70_Thing.java" 
+    binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="324" y="347"/>    
+    <display autosize="true" stereotype="false" package="false" initial-value="false" signature="false" 
+      sort-features="false" accessors="true" visibility="false">      
+      <attributes public="false" package="false" protected="false" private="false" static="false"/>      
+      <operations public="false" package="false" protected="false" private="false" static="false"/>    
+    </display>  
+  </interface>  
+  <interface id="6" language="java" name="org.gcube.informationsystem.model.entity.Resource" 
+    project="information-system-model" 
+    file="/information-system-model/src/main/java/org/gcube/informationsystem/model/entity/Resource.java" binary="false" 
+    corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="324" y="256"/>    
+    <display autosize="true" stereotype="false" package="false" initial-value="false" signature="false" 
+      sort-features="false" accessors="true" visibility="false">      
+      <attributes public="false" package="false" protected="false" private="false" static="false"/>      
+      <operations public="false" package="false" protected="false" private="false" static="false"/>    
+    </display>  
+  </interface>  
+  <generalization id="7">    
+    <end type="SOURCE" refId="4"/>    
+    <end type="TARGET" refId="6"/>  
+  </generalization>  
+  <generalization id="8">    
+    <end type="SOURCE" refId="5"/>    
+    <end type="TARGET" refId="6"/>  
+  </generalization>  
+  <generalization id="9">    
+    <end type="SOURCE" refId="1"/>    
+    <end type="TARGET" refId="6"/>  
+  </generalization>  
+  <generalization id="10">    
+    <end type="SOURCE" refId="2"/>    
+    <end type="TARGET" refId="6"/>  
+  </generalization>  
+  <generalization id="11">    
+    <end type="SOURCE" refId="3"/>    
+    <end type="TARGET" refId="6"/>  
+  </generalization>  
+  <classifier-display autosize="true" stereotype="false" package="false" initial-value="false" signature="false" 
+    sort-features="false" accessors="true" visibility="false">    
+    <attributes public="false" package="false" protected="false" private="false" static="false"/>    
+    <operations public="false" package="false" protected="false" private="false" static="false"/>  
+  </classifier-display>  
+  <association-display labels="true" multiplicity="true"/>
+</class-diagram>
\ No newline at end of file