Change the way sequence definition are managed. They are now when present stored as an attribute

Former-commit-id: 6e618377c05b42937d2eace3c9668390980ab68c

pkg/obiutils/cast_interface.go

@@ -1,5 +1,17 @@
 package obiutils
 
+import "fmt"
+
+// InterfaceToString converts an interface value to a string.
+//
+// The function takes an interface{} value as a parameter and returns a string representation of that value.
+// It returns the string representation and an error if any occurred during the conversion process.
+func InterfaceToString(i interface{}) (val string, err error) {
+	err = nil
+	val = fmt.Sprintf("%v", i)
+	return
+}
+
 // CastableToInt checks if the given input can be casted to an integer.
 //
 // i: the value to check for castability.