/// <summary>
        /// Parse Questionnaire
        /// </summary>
        public static Hl7.Fhir.Model.Questionnaire ParseQuestionnaire(IFhirReader reader, ErrorList errors, Hl7.Fhir.Model.Questionnaire existingInstance = null)
        {
            Hl7.Fhir.Model.Questionnaire result = existingInstance != null ? existingInstance : new Hl7.Fhir.Model.Questionnaire();
            string currentElementName           = reader.CurrentElementName;

            reader.EnterElement();

            while (reader.HasMoreElements())
            {
                var atName = reader.CurrentElementName;
                // Parse element extension
                if (atName == "extension")
                {
                    result.Extension = new List <Hl7.Fhir.Model.Extension>();
                    reader.EnterArray();

                    while (ParserUtils.IsAtArrayElement(reader, "extension"))
                    {
                        result.Extension.Add(ExtensionParser.ParseExtension(reader, errors));
                    }

                    reader.LeaveArray();
                }

                // Parse element language
                else if (atName == "language")
                {
                    result.LanguageElement = CodeParser.ParseCode(reader, errors);
                }

                // Parse element text
                else if (atName == "text")
                {
                    result.Text = NarrativeParser.ParseNarrative(reader, errors);
                }

                // Parse element contained
                else if (atName == "contained")
                {
                    result.Contained = new List <Hl7.Fhir.Model.Resource>();
                    reader.EnterArray();

                    while (ParserUtils.IsAtArrayElement(reader, "contained"))
                    {
                        result.Contained.Add(ParserUtils.ParseContainedResource(reader, errors));
                    }

                    reader.LeaveArray();
                }

                // Parse element _id
                else if (atName == "_id")
                {
                    result.LocalIdElement = Id.Parse(reader.ReadPrimitiveContents(typeof(Id)));
                }

                // Parse element status
                else if (atName == "status")
                {
                    result.StatusElement = CodeParser.ParseCode <Hl7.Fhir.Model.ObservationStatus>(reader, errors);
                }

                // Parse element authored
                else if (atName == "authored")
                {
                    result.AuthoredElement = FhirDateTimeParser.ParseFhirDateTime(reader, errors);
                }

                // Parse element subject
                else if (atName == "subject")
                {
                    result.Subject = ResourceReferenceParser.ParseResourceReference(reader, errors);
                }

                // Parse element author
                else if (atName == "author")
                {
                    result.Author = ResourceReferenceParser.ParseResourceReference(reader, errors);
                }

                // Parse element source
                else if (atName == "source")
                {
                    result.Source = ResourceReferenceParser.ParseResourceReference(reader, errors);
                }

                // Parse element name
                else if (atName == "name")
                {
                    result.Name = CodeableConceptParser.ParseCodeableConcept(reader, errors);
                }

                // Parse element identifier
                else if (atName == "identifier")
                {
                    result.Identifier = IdentifierParser.ParseIdentifier(reader, errors);
                }

                // Parse element encounter
                else if (atName == "encounter")
                {
                    result.Encounter = ResourceReferenceParser.ParseResourceReference(reader, errors);
                }

                // Parse element question
                else if (atName == "question")
                {
                    result.Question = new List <Hl7.Fhir.Model.Questionnaire.QuestionComponent>();
                    reader.EnterArray();

                    while (ParserUtils.IsAtArrayElement(reader, "question"))
                    {
                        result.Question.Add(QuestionnaireParser.ParseQuestionComponent(reader, errors));
                    }

                    reader.LeaveArray();
                }

                // Parse element group
                else if (atName == "group")
                {
                    result.Group = new List <Hl7.Fhir.Model.Questionnaire.GroupComponent>();
                    reader.EnterArray();

                    while (ParserUtils.IsAtArrayElement(reader, "group"))
                    {
                        result.Group.Add(QuestionnaireParser.ParseGroupComponent(reader, errors));
                    }

                    reader.LeaveArray();
                }

                else
                {
                    errors.Add(String.Format("Encountered unknown element {0} while parsing {1}", reader.CurrentElementName, currentElementName), reader);
                    reader.SkipSubElementsFor(currentElementName);
                    result = null;
                }
            }

            reader.LeaveElement();
            return(result);
        }
        /// <summary>
        /// Parse GroupComponent
        /// </summary>
        public static Hl7.Fhir.Model.Questionnaire.GroupComponent ParseGroupComponent(IFhirReader reader, ErrorList errors, Hl7.Fhir.Model.Questionnaire.GroupComponent existingInstance = null)
        {
            Hl7.Fhir.Model.Questionnaire.GroupComponent result = existingInstance != null ? existingInstance : new Hl7.Fhir.Model.Questionnaire.GroupComponent();
            string currentElementName = reader.CurrentElementName;

            reader.EnterElement();

            while (reader.HasMoreElements())
            {
                var atName = reader.CurrentElementName;
                // Parse element extension
                if (atName == "extension")
                {
                    result.Extension = new List <Hl7.Fhir.Model.Extension>();
                    reader.EnterArray();

                    while (ParserUtils.IsAtArrayElement(reader, "extension"))
                    {
                        result.Extension.Add(ExtensionParser.ParseExtension(reader, errors));
                    }

                    reader.LeaveArray();
                }

                // Parse element _id
                else if (atName == "_id")
                {
                    result.LocalIdElement = Id.Parse(reader.ReadPrimitiveContents(typeof(Id)));
                }

                // Parse element name
                else if (atName == "name")
                {
                    result.Name = CodeableConceptParser.ParseCodeableConcept(reader, errors);
                }

                // Parse element header
                else if (atName == "header")
                {
                    result.HeaderElement = FhirStringParser.ParseFhirString(reader, errors);
                }

                // Parse element text
                else if (atName == "text")
                {
                    result.TextElement = FhirStringParser.ParseFhirString(reader, errors);
                }

                // Parse element subject
                else if (atName == "subject")
                {
                    result.Subject = ResourceReferenceParser.ParseResourceReference(reader, errors);
                }

                // Parse element question
                else if (atName == "question")
                {
                    result.Question = new List <Hl7.Fhir.Model.Questionnaire.QuestionComponent>();
                    reader.EnterArray();

                    while (ParserUtils.IsAtArrayElement(reader, "question"))
                    {
                        result.Question.Add(QuestionnaireParser.ParseQuestionComponent(reader, errors));
                    }

                    reader.LeaveArray();
                }

                // Parse element group
                else if (atName == "group")
                {
                    result.Group = new List <Hl7.Fhir.Model.Questionnaire.GroupComponent>();
                    reader.EnterArray();

                    while (ParserUtils.IsAtArrayElement(reader, "group"))
                    {
                        result.Group.Add(QuestionnaireParser.ParseGroupComponent(reader, errors));
                    }

                    reader.LeaveArray();
                }

                else
                {
                    errors.Add(String.Format("Encountered unknown element {0} while parsing {1}", reader.CurrentElementName, currentElementName), reader);
                    reader.SkipSubElementsFor(currentElementName);
                    result = null;
                }
            }

            reader.LeaveElement();
            return(result);
        }