diff --git a/kernel/av/av.go b/kernel/av/av.go
index e38af8f1c..7dcc2bfa2 100644
--- a/kernel/av/av.go
+++ b/kernel/av/av.go
@@ -81,16 +81,20 @@ type AttributeViewFilter struct {
 type FilterOperator string
 
 const (
-	FilterOperatorEq          FilterOperator = "="
-	FilterOperatorNe          FilterOperator = "!="
-	FilterOperatorGt          FilterOperator = ">"
-	FilterOperatorGe          FilterOperator = ">="
-	FilterOperatorLt          FilterOperator = "<"
-	FilterOperatorLe          FilterOperator = "<="
-	FilterOperatorContains    FilterOperator = "CONTAINS"
-	FilterOperatorNotContains FilterOperator = "NOT CONTAINS"
-	FilterOperatorIsEmpty     FilterOperator = "IS EMPTY"
-	FilterOperatorIsNotEmpty  FilterOperator = "IS NOT EMPTY"
+	FilterOperatorIsEqual           FilterOperator = "="
+	FilterOperatorIsNotEqual        FilterOperator = "!="
+	FilterOperatorIsGreater         FilterOperator = ">"
+	FilterOperatorIsGreaterOrEqual  FilterOperator = ">="
+	FilterOperatorIsLess            FilterOperator = "<"
+	FilterOperatorIsLessOrEqual     FilterOperator = "<="
+	FilterOperatorContains          FilterOperator = "Contains"
+	FilterOperatorDoesNotContain    FilterOperator = "Does not contains"
+	FilterOperatorIsEmpty           FilterOperator = "Is empty"
+	FilterOperatorIsNotEmpty        FilterOperator = "Is not empty"
+	FilterOperatorStartsWith        FilterOperator = "Starts with"
+	FilterOperatorEndsWith          FilterOperator = "Ends with"
+	FilterOperatorIsBetween         FilterOperator = "Is between"
+	FilterOperatorIsRelativeToToday FilterOperator = "Is relative to today"
 )
 
 type AttributeViewSort struct {
diff --git a/kernel/av/cell.go b/kernel/av/cell.go
index a0e7b1aae..8be93b97b 100644
--- a/kernel/av/cell.go
+++ b/kernel/av/cell.go
@@ -110,33 +110,33 @@ func (value *Value) CompareOperator(other *Value, operator FilterOperator) bool
 	}
 	if nil != value.Number && nil != other.Number {
 		switch operator {
-		case FilterOperatorEq:
+		case FilterOperatorIsEqual:
 			return value.Number.Content == other.Number.Content
-		case FilterOperatorNe:
+		case FilterOperatorIsNotEqual:
 			return value.Number.Content != other.Number.Content
-		case FilterOperatorGt:
+		case FilterOperatorIsGreater:
 			return value.Number.Content > other.Number.Content
-		case FilterOperatorGe:
+		case FilterOperatorIsGreaterOrEqual:
 			return value.Number.Content >= other.Number.Content
-		case FilterOperatorLt:
+		case FilterOperatorIsLess:
 			return value.Number.Content < other.Number.Content
-		case FilterOperatorLe:
+		case FilterOperatorIsLessOrEqual:
 			return value.Number.Content <= other.Number.Content
 		}
 	}
 	if nil != value.Date && nil != other.Date {
 		switch operator {
-		case FilterOperatorEq:
+		case FilterOperatorIsEqual:
 			return value.Date.Content == other.Date.Content
-		case FilterOperatorNe:
+		case FilterOperatorIsNotEqual:
 			return value.Date.Content != other.Date.Content
-		case FilterOperatorGt:
+		case FilterOperatorIsGreater:
 			return value.Date.Content > other.Date.Content
-		case FilterOperatorGe:
+		case FilterOperatorIsGreaterOrEqual:
 			return value.Date.Content >= other.Date.Content
-		case FilterOperatorLt:
+		case FilterOperatorIsLess:
 			return value.Date.Content < other.Date.Content
-		case FilterOperatorLe:
+		case FilterOperatorIsLessOrEqual:
 			return value.Date.Content <= other.Date.Content
 		}
 	}