public static ElementDefinition.TypeRefComponent GetTypeRef(this ElementDefinition elementDefinition,
                                                                    String type,
                                                                    bool createFlag = false)
        {
            if (elementDefinition is null)
            {
                throw new ArgumentNullException(nameof(elementDefinition));
            }

            foreach (ElementDefinition.TypeRefComponent typeRef in elementDefinition.Type)
            {
                if (typeRef.Code == type)
                {
                    return(typeRef);
                }
            }
            if (createFlag == false)
            {
                return(null);
            }
            {
                ElementDefinition.TypeRefComponent typeRef = new ElementDefinition.TypeRefComponent
                {
                    Code = type
                };
                elementDefinition.AddType(typeRef);
                return(typeRef);
            }
        }