diff --git a/src/org/gcube/vremanagement/vremodeler/impl/util/Listable.java b/src/org/gcube/vremanagement/vremodeler/impl/util/Listable.java
new file mode 100644
index 0000000..2df2e82
--- /dev/null
+++ b/src/org/gcube/vremanagement/vremodeler/impl/util/Listable.java
@@ -0,0 +1,8 @@
+package org.gcube.vremanagement.vremodeler.impl.util;
+
+import java.util.List;
+
+public interface Listable {
+	
+	public List<String> getAsStringList();
+}
diff --git a/src/org/gcube/vremanagement/vremodeler/impl/util/MFRelationDerivate.java b/src/org/gcube/vremanagement/vremodeler/impl/util/MFRelationDerivate.java
new file mode 100644
index 0000000..296dbec
--- /dev/null
+++ b/src/org/gcube/vremanagement/vremodeler/impl/util/MFRelationDerivate.java
@@ -0,0 +1,23 @@
+package org.gcube.vremanagement.vremodeler.impl.util;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class MFRelationDerivate extends MFRelationNative {
+
+	private String transformationProgramId;
+	
+	public MFRelationDerivate(String collectionId, String metaFormatId, String transformationProgramId) {
+		super(collectionId, metaFormatId);
+		this.transformationProgramId= transformationProgramId;
+	}
+
+	public String getTransformationProgramId(){
+		return this.transformationProgramId;
+	}
+	
+	public List<String> getAsStringList(){
+		return Arrays.asList(new String[]{super.getMetadataCollectionId(), super.getMetadataFormatId(), this.getMetadataFormatId()});
+	}
+	
+}
diff --git a/src/org/gcube/vremanagement/vremodeler/impl/util/MFRelationNative.java b/src/org/gcube/vremanagement/vremodeler/impl/util/MFRelationNative.java
new file mode 100644
index 0000000..597d258
--- /dev/null
+++ b/src/org/gcube/vremanagement/vremodeler/impl/util/MFRelationNative.java
@@ -0,0 +1,33 @@
+package org.gcube.vremanagement.vremodeler.impl.util;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class MFRelationNative implements Listable{
+
+	private String metaCollectionID;
+	private String metaFormatID;
+		
+	
+	public MFRelationNative(String collectionId, String metaFormatId){
+		this.metaCollectionID= collectionId;
+		this.metaFormatID= metaFormatId;
+	}
+	
+	public List<String> getAsStringList(){
+		return Arrays.asList(new String[]{this.metaCollectionID, this.metaFormatID});
+	}
+	
+	public String getMetadataCollectionId(){
+		return this.metaCollectionID;
+	}
+	
+	public String getMetadataFormatId(){
+		return this.metaFormatID;
+	}
+	
+	public boolean equals(Object o){
+		MFRelationNative mf= (MFRelationNative) o;
+		return (this.metaCollectionID==mf.getMetadataCollectionId()) && (this.metaFormatID==mf.getMetadataFormatId());
+	}
+}
diff --git a/src/org/gcube/vremanagement/vremodeler/impl/util/MetadataFormat.java b/src/org/gcube/vremanagement/vremodeler/impl/util/MetadataFormat.java
index d5c8335..efcc11e 100644
--- a/src/org/gcube/vremanagement/vremodeler/impl/util/MetadataFormat.java
+++ b/src/org/gcube/vremanagement/vremodeler/impl/util/MetadataFormat.java
@@ -1,27 +1,33 @@
 package org.gcube.vremanagement.vremodeler.impl.util;
 
-import org.gcube.common.core.informationsystem.client.XMLResult;
-import org.gcube.common.core.informationsystem.client.XMLResult.ISResultEvaluationException;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.List;
 import org.gcube.common.core.utils.logging.GCUBELog;
 
-public class MetadataFormat{
+public class MetadataFormat implements Listable{
 
 	
-	private static GCUBELog log= new GCUBELog(MetadataFormat.class.getName());
-	private String name;
-	private String schemaURI;
-	private String language;
+	private final static GCUBELog log= new GCUBELog(MetadataFormat.class.getName());
 	
+	private String id;
+	private String name;
+	private URI schemaURI;
+	private String language;
+		
 	public MetadataFormat(){}
 	
-	public MetadataFormat(XMLResult xml){
-		try {
-			name= xml.evaluate("//Name/text()").get(0);
-			schemaURI=  xml.evaluate("//SchemaURI/text()").get(0);
-			language= xml.evaluate("//lng/text()").get(0);
-		}catch(ISResultEvaluationException ise){ 
-			log.error("Error parsing th emetadata "+ise.getMessage());
-		}
+	public MetadataFormat(String id, String name, URI schemaURI, String language){
+		log.trace("created a metadataFormat Object with "+id);
+		this.id= id;
+		this.name=name;
+		this.language= language;
+		this.schemaURI= schemaURI;
+		
+	}
+	
+	public String getId(){
+		return id;
 	}
 	
 	public String getName(){
@@ -32,12 +38,12 @@ public class MetadataFormat{
 		name= Name;
 	}
 	
-	public String getSchemaURI(){
+	public URI getSchemaURI(){
 		return schemaURI;
 	}
 	
-	public void setSchemaURI(String schemaURI){
-		name= schemaURI;
+	public void setSchemaURI(URI schemaURI){
+		this.schemaURI= schemaURI;
 	}
 	
 	public String getLanguage(){
@@ -45,7 +51,7 @@ public class MetadataFormat{
 	}
 	
 	public void setLanguage(String lng){
-		name= lng;
+		this.language= lng;
 	}
 	
 	@Override
@@ -55,7 +61,11 @@ public class MetadataFormat{
 				(this.language.compareTo(mf.getLanguage())==0) &&
 				(this.schemaURI.compareTo(mf.getSchemaURI())==0));
 	}
-
+	
+	public List<String> getAsStringList(){
+		return  Arrays.asList(new String[]{this.id, this.name, this.schemaURI.getScheme(), this.language});
+	}
+	
 
 	
 }