/// <summary>
        /// Creates a new criteria from the original which contains unresolved dependencies.
        /// Note: The extended definition references a criteria which may reference additional definitions as well.
        /// This method is able to resolve these dependencies, then create one that holds only atomic values.
        /// </summary>
        /// <param name="rootCriteria"></param>
        /// <returns></returns>
        private Criteria TraverseCriteria(Criteria rootCriteria)
        {
            // New criteria
            Criteria resultCriteria = new Criteria
            {
                ApplicabilityCheck = rootCriteria.ApplicabilityCheck,
                Comment = rootCriteria.Comment,
                Negate = rootCriteria.Negate,
                Operator = rootCriteria.Operator,
                Criterions = new List<Criterion>(),
                Criterias = new List<Criteria>()
            };

            // Add criterion items
            if (rootCriteria.Criterions != null && rootCriteria.Criterions.Count != 0)
            {
                resultCriteria.Criterions.AddRange(rootCriteria.Criterions);
            }

            // Traverse criterias
            if (rootCriteria.Criterias != null && rootCriteria.Criterias.Count != 0)
            {
                foreach (Criteria item in rootCriteria.Criterias)
                {
                    Criteria criteria = TraverseCriteria(item);
                    resultCriteria.Criterias.Add(criteria);
                }
            }

            // Handle extended definitions
            if (rootCriteria.ExtendDefinitions != null && rootCriteria.ExtendDefinitions.Count != 0)
            {
                foreach (ExtendDefinition definition in rootCriteria.ExtendDefinitions)
                {
                    Definition definitionRef = RawDefinitions.FirstOrDefault(c => c.ID == definition.DefinitionRef);
                    Criteria criteria = TraverseCriteria(definitionRef.Criteria);
                    resultCriteria.Criterias.Add(criteria);
                }
            }

            return resultCriteria;
        }