diff --git a/src/main/java/org/gcube/gcat/api/CMItemStatus.java b/src/main/java/org/gcube/gcat/api/CMItemStatus.java
new file mode 100644
index 0000000..5292024
--- /dev/null
+++ b/src/main/java/org/gcube/gcat/api/CMItemStatus.java
@@ -0,0 +1,40 @@
+package org.gcube.gcat.api;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
+public enum CMItemStatus {
+
+	PENDING("pending"),
+	APPROVED("approved"),
+	REJECTED("rejected");
+	
+	protected static final Map<String,CMItemStatus> CM_ITEM_STATUS_FROM_VALUE;
+	
+	static {
+		CM_ITEM_STATUS_FROM_VALUE = new HashMap<>();
+		
+		for(CMItemStatus s : CMItemStatus.values()) {
+			CM_ITEM_STATUS_FROM_VALUE.put(s.getValue(), s);
+		}
+	}
+	
+	protected final String value;
+	
+	private CMItemStatus(String value) {
+		this.value = value;
+	}
+	
+	public String getValue() {
+		return value;
+	}
+	
+	public static CMItemStatus getCMItemStatusFromValue(String value) {
+		return CM_ITEM_STATUS_FROM_VALUE.get(value);
+	}
+
+	
+}
diff --git a/src/main/java/org/gcube/gcat/api/CMItemVisibility.java b/src/main/java/org/gcube/gcat/api/CMItemVisibility.java
new file mode 100644
index 0000000..5f45825
--- /dev/null
+++ b/src/main/java/org/gcube/gcat/api/CMItemVisibility.java
@@ -0,0 +1,37 @@
+package org.gcube.gcat.api;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
+public enum CMItemVisibility {
+
+	RESTRICTED("restricted"),
+	PUBLIC("public");
+	
+	protected static final Map<String,CMItemStatus> CM_ITEM_VISIBILITY_FROM_VALUE;
+	
+	static {
+		CM_ITEM_VISIBILITY_FROM_VALUE = new HashMap<>();
+		
+		for(CMItemStatus s : CMItemStatus.values()) {
+			CM_ITEM_VISIBILITY_FROM_VALUE.put(s.getValue(), s);
+		}
+	}
+	
+	protected final String value;
+	
+	private CMItemVisibility(String value) {
+		this.value = value;
+	}
+	
+	public String getValue() {
+		return value;
+	}
+	
+	public static CMItemStatus getCMItemStatusFromValue(String value) {
+		return CM_ITEM_VISIBILITY_FROM_VALUE.get(value);
+	}
+}
diff --git a/src/main/java/org/gcube/gcat/api/GCatConstants.java b/src/main/java/org/gcube/gcat/api/GCatConstants.java
index 2b2e63d..6afd7ff 100644
--- a/src/main/java/org/gcube/gcat/api/GCatConstants.java
+++ b/src/main/java/org/gcube/gcat/api/GCatConstants.java
@@ -1,5 +1,8 @@
 package org.gcube.gcat.api;
 
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
 public class GCatConstants {
 	
 	public static final String SERVICE_CLASS = "data-catalogue";
@@ -21,4 +24,13 @@ public class GCatConstants {
 
 	public static final String ORGANIZATION_FILTER_TEMPLATE = ORGANIZATION_PARAMETER + ":%s";
 	
+	public static final String CATALOGUE_MEMBER = "Catalogue-Member";
+	public static final String CATALOGUE_EDITOR = "Catalogue-Editor";
+	public static final String CATALOGUE_ADMIN = "Catalogue-Admin";
+	public static final String CATALOGUE_MODERATOR = "Catalogue-Moderator";
+	
+	/* Content Moderation fields */
+	public static final String CM_ITEM_STATUS = "system:cm_item_status";
+	public static final String CM_ITEM_VISIBILITY = "system:cm_item_visibility";
+	
 }
diff --git a/src/main/java/org/gcube/gcat/api/Role.java b/src/main/java/org/gcube/gcat/api/Role.java
new file mode 100644
index 0000000..be68ba1
--- /dev/null
+++ b/src/main/java/org/gcube/gcat/api/Role.java
@@ -0,0 +1,62 @@
+package org.gcube.gcat.api;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author Luca Frosini (ISTI - CNR)
+ */
+public enum Role {
+	
+	MEMBER(GCatConstants.CATALOGUE_MEMBER, "member"), EDITOR(GCatConstants.CATALOGUE_EDITOR, "editor"), ADMIN(GCatConstants.CATALOGUE_ADMIN, "admin");
+	
+	private final String portalRole;
+	private final String ckanRole;
+	
+	Role(String portalRole, String ckanRole) {
+		this.portalRole = portalRole;
+		this.ckanRole = ckanRole;
+	}
+	
+	public String getPortalRole() {
+		return portalRole;
+	}
+	
+	public String getCkanRole() {
+		return ckanRole;
+	}
+	
+	protected static final Map<String,Role> ROLE_BY_PORTAL_ROLE;
+	protected static final Map<String,Role> ROLE_BY_CKAN_ROLE;
+	
+	static {
+		ROLE_BY_PORTAL_ROLE = new HashMap<String,Role>();
+		
+		// null or empty string identify a member
+		ROLE_BY_PORTAL_ROLE.put(null, MEMBER);
+		ROLE_BY_PORTAL_ROLE.put("", MEMBER);
+		
+		ROLE_BY_CKAN_ROLE = new HashMap<String,Role>();
+		
+		for(Role role : Role.values()) {
+			ROLE_BY_PORTAL_ROLE.put(role.getPortalRole(), role);
+			ROLE_BY_CKAN_ROLE.put(role.getCkanRole(), role);
+		}
+	}
+	
+	public static Role getRoleFromPortalRole(String portalRole) {
+		return ROLE_BY_PORTAL_ROLE.get(portalRole);
+	}
+	
+	public static String getCkanRoleFromPortalRole(String portalRole) {
+		return getRoleFromPortalRole(portalRole).getCkanRole();
+	}
+	
+	public static Role getRoleFromCkanRole(String ckanRole) {
+		return ROLE_BY_CKAN_ROLE.get(ckanRole);
+	}
+	
+	public static String getPortalRoleFromCkanRole(String ckanRole) {
+		return getRoleFromCkanRole(ckanRole).getPortalRole();
+	}
+}
\ No newline at end of file