diff --git a/src/main/java/org/gcube/informationsystem/model/reference/entities/Facet.java b/src/main/java/org/gcube/informationsystem/model/reference/entities/Facet.java
index 7ed50af..78028c1 100644
--- a/src/main/java/org/gcube/informationsystem/model/reference/entities/Facet.java
+++ b/src/main/java/org/gcube/informationsystem/model/reference/entities/Facet.java
@@ -4,10 +4,7 @@ import java.util.Map;
 
 import org.gcube.com.fasterxml.jackson.annotation.JsonAnyGetter;
 import org.gcube.com.fasterxml.jackson.annotation.JsonAnySetter;
-import org.gcube.com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import org.gcube.com.fasterxml.jackson.databind.annotation.JsonSerialize;
-import org.gcube.informationsystem.base.reference.Element;
-import org.gcube.informationsystem.base.reference.IdentifiableElement;
 import org.gcube.informationsystem.base.reference.SchemaMixedElement;
 import org.gcube.informationsystem.serialization.AdditionalPropertiesSerializer;
 import org.gcube.informationsystem.types.annotations.Abstract;