nicholas@2690: /* globals document, console, DOMParser */
nicholas@2224: function Specification() {
nicholas@2690:     var schemaRoot;
nicholas@2690:     var schemaString;
nicholas@2538:     // Handles the decoding of the project specification XML into a simple JavaScript Object.
nicholas@2538: 
nicholas@2378:     // <setup> attributes
nicholas@2688:     this.interface = undefined;
nicholas@2688:     this.projectReturn = undefined;
nicholas@2688:     this.returnURL = undefined;
nicholas@2688:     this.randomiseOrder = undefined;
nicholas@2688:     this.poolSize = undefined;
nicholas@2688:     this.loudness = undefined;
nicholas@2688:     this.sampleRate = undefined;
nicholas@2688:     this.crossFade = undefined;
nicholas@2688:     this.preSilence = undefined;
nicholas@2688:     this.postSilence = undefined;
nicholas@2688:     this.playOne = undefined;
nicholas@2822:     this.minNumberPlays = undefined;
nicholas@2822:     this.maxNumberPlays = undefined;
nicholas@3062:     this.randomiseAxisOrder = undefined;
nicholas@2538: 
nicholas@2378:     // nodes
nicholas@2854:     this.metrics = new metricNode();
nicholas@2857:     this.preTest = new surveyNode(this);
nicholas@2857:     this.postTest = new surveyNode(this);
nicholas@2866:     this.preTest.location = "pre";
nicholas@2866:     this.postTest.location = "post";
nicholas@2538:     this.pages = [];
nicholas@2854:     this.interfaces = new interfaceNode(this);
nicholas@2538:     this.errors = [];
nicholas@2224:     this.exitText = "Thank you.";
nicholas@2538: 
nicholas@2857:     // Creators
nicholas@2857:     this.createNewPage = function () {
nicholas@2857:         var newpage = new page(this);
nicholas@2857:         this.pages.push(newpage);
nicholas@2857:         return newpage;
nicholas@2859:     };
nicholas@2857: 
nicholas@2687:     var processAttribute = function (attribute, schema) {
nicholas@2538:         // attribute is the string returned from getAttribute on the XML
nicholas@2538:         // schema is the <xs:attribute> node
nicholas@2687:         if (schema.getAttribute('name') === null && schema.getAttribute('ref') !== undefined) {
nicholas@2852:             schema = schemaRoot.querySelector("[name=" + schema.getAttribute('ref') + "]");
nicholas@2538:         }
nicholas@2538:         var defaultOpt = schema.getAttribute('default');
nicholas@2684:         if (attribute === null) {
nicholas@2538:             attribute = defaultOpt;
nicholas@2538:         }
nicholas@2538:         var dataType = schema.getAttribute('type');
nicholas@2538:         if (typeof dataType == "string") {
nicholas@2538:             dataType = dataType.substr(3);
nicholas@2538:         } else {
nicholas@2852:             var rest = schema.querySelectorAll("restriction,enumeration");
nicholas@2224:             if (rest.length > 0) {
nicholas@2224:                 dataType = rest[0].getAttribute("base");
nicholas@2224:                 if (typeof dataType == "string") {
nicholas@2224:                     dataType = dataType.substr(3);
nicholas@2224:                 } else {
nicholas@2224:                     dataType = "string";
nicholas@2224:                 }
nicholas@2224:             } else {
nicholas@2224:                 dataType = "string";
nicholas@2224:             }
nicholas@2224:         }
nicholas@2684:         if (attribute === null) {
nicholas@2538:             return attribute;
nicholas@2538:         }
nicholas@2538:         switch (dataType) {
nicholas@2538:             case "boolean":
nicholas@2538:                 if (attribute == 'true') {
nicholas@2538:                     attribute = true;
nicholas@2538:                 } else {
nicholas@2538:                     attribute = false;
nicholas@2538:                 }
nicholas@2538:                 break;
nicholas@2538:             case "negativeInteger":
nicholas@2538:             case "positiveInteger":
nicholas@2538:             case "nonNegativeInteger":
nicholas@2538:             case "nonPositiveInteger":
nicholas@2538:             case "integer":
nicholas@2538:             case "decimal":
nicholas@2538:             case "short":
nicholas@2538:                 attribute = Number(attribute);
nicholas@2538:                 break;
nicholas@2538:             default:
nicholas@2538:                 attribute = String(attribute);
nicholas@2538:                 break;
nicholas@2538:         }
nicholas@2538:         return attribute;
nicholas@2538:     };
nicholas@2538: 
nicholas@2687:     this.processSchema = function (schemaXSD) {
nicholas@2687:         if (schemaRoot === undefined) {
nicholas@2687:             schemaString = schemaXSD;
nicholas@2687:             var parse = new DOMParser();
nicholas@2687:             schemaRoot = parse.parseFromString(schemaString, 'text/xml');
nicholas@2687:             Object.defineProperties(this, {
nicholas@2687:                 'schema': {
nicholas@2687:                     'value': schemaRoot
nicholas@2687:                 },
nicholas@2687:                 'schemaString': {
nicholas@2687:                     'value': schemaString
nicholas@2687:                 }
nicholas@2687:             });
nicholas@2687:         }
nicholas@2690:     };
nicholas@2687:     this.getSchema = function () {
nicholas@2687:         return schemaRoot;
nicholas@2690:     };
nicholas@2687:     this.getSchemaString = function () {
nicholas@2687:         return schemaString;
nicholas@2690:     };
nicholas@2687: 
nicholas@2538:     this.decode = function (projectXML) {
nicholas@2687:         schemaRoot = this.schema;
nicholas@2538:         this.errors = [];
nicholas@2538:         // projectXML - DOM Parsed document
nicholas@2538:         this.projectXML = projectXML.childNodes[0];
nicholas@2538:         var setupNode = projectXML.getElementsByTagName('setup')[0];
nicholas@2852:         var schemaSetup = schemaRoot.querySelector('[name=setup]');
nicholas@2538:         // First decode the attributes
nicholas@2852:         var attributes = schemaSetup.querySelectorAll('attribute');
nicholas@2684:         var i;
nicholas@2684:         for (i = 0; i < attributes.length; i++) {
nicholas@2538:             var attributeName = attributes[i].getAttribute('name') || attributes[i].getAttribute('ref');
nicholas@2538:             var projectAttr = setupNode.getAttribute(attributeName);
nicholas@2692:             projectAttr = processAttribute(projectAttr, attributes[i]);
nicholas@2687:             if (projectAttr !== null) {
nicholas@2687:                 this[attributeName] = projectAttr;
nicholas@2538:             }
nicholas@2538:         }
n@3103:         if (projectXML.getElementsByTagName('calibration').length > 0) {
n@3103:             this.calibration.decode(this, projectXML.getElementsByTagName('calibration')[0]);
n@3103:         }
nicholas@2538: 
nicholas@2224:         var exitTextNode = setupNode.getElementsByTagName('exitText');
nicholas@2224:         if (exitTextNode.length == 1) {
nicholas@2224:             this.exitText = exitTextNode[0].textContent;
nicholas@2224:         }
nicholas@2538: 
nicholas@2538:         this.metrics.decode(this, setupNode.getElementsByTagName('metric')[0]);
nicholas@2538: 
nicholas@2538:         // Now process the survey node options
nicholas@2538:         var survey = setupNode.getElementsByTagName('survey');
nicholas@2684:         for (i = 0; i < survey.length; i++) {
nicholas@2538:             var location = survey[i].getAttribute('location');
nicholas@2538:             switch (location) {
nicholas@2257:                 case 'pre':
nicholas@2257:                 case 'before':
nicholas@2538:                     this.preTest.decode(this, survey[i]);
nicholas@2257:                     break;
nicholas@2257:                 case 'post':
nicholas@2257:                 case 'after':
nicholas@2538:                     this.postTest.decode(this, survey[i]);
nicholas@2257:                     break;
nicholas@2257:             }
nicholas@2538:         }
nicholas@2538: 
nicholas@2538:         var interfaceNode = setupNode.getElementsByTagName('interface');
nicholas@2538:         if (interfaceNode.length > 1) {
nicholas@2538:             this.errors.push("Only one <interface> node in the <setup> node allowed! Others except first ingnored!");
nicholas@2538:         }
nicholas@2854: 
nicholas@2684:         if (interfaceNode.length !== 0) {
nicholas@2538:             interfaceNode = interfaceNode[0];
nicholas@2852:             this.interfaces.decode(this, interfaceNode, this.schema.querySelectorAll('[name=interface]')[1]);
nicholas@2538:         }
nicholas@2538: 
nicholas@2538:         // Page tags
nicholas@2538:         var pageTags = projectXML.getElementsByTagName('page');
nicholas@2852:         var pageSchema = this.schema.querySelector('[name=page]');
nicholas@2684:         for (i = 0; i < pageTags.length; i++) {
nicholas@2854:             var node = new page(this);
nicholas@2538:             node.decode(this, pageTags[i], pageSchema);
nicholas@2538:             this.pages.push(node);
nicholas@2941:             for (var r = 0; r < node.repeatCount; r++) {
nicholas@2941:                 var repeat = new page(this);
nicholas@2941:                 repeat.decode(this, pageTags[i], pageSchema);
nicholas@2941:                 repeat.id += "-repeat-" + r;
nicholas@2941:                 this.pages.push(repeat);
nicholas@2941:             }
nicholas@2538:         }
nicholas@2538:     };
nicholas@2538: 
nicholas@2538:     this.encode = function () {
nicholas@2538:         var RootDocument = document.implementation.createDocument(null, "waet");
nicholas@2538:         var root = RootDocument.firstChild;
nicholas@2538:         root.setAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
nicholas@2538:         root.setAttribute("xsi:noNamespaceSchemaLocation", "test-schema.xsd");
nicholas@2538:         // Build setup node
nicholas@2224:         var setup = RootDocument.createElement("setup");
nicholas@2852:         var schemaSetup = schemaRoot.querySelector('[name=setup]');
nicholas@2224:         // First decode the attributes
nicholas@2852:         var attributes = schemaSetup.querySelectorAll('attribute');
nicholas@2538:         for (var i = 0; i < attributes.length; i++) {
nicholas@2224:             var name = attributes[i].getAttribute("name");
nicholas@2895:             if (name === null) {
nicholas@2224:                 name = attributes[i].getAttribute("ref");
nicholas@2224:             }
nicholas@2685:             if (this[name] !== undefined || attributes[i].getAttribute("use") == "required") {
nicholas@2685:                 setup.setAttribute(name, this[name]);
nicholas@2224:             }
nicholas@2224:         }
nicholas@2224:         root.appendChild(setup);
nicholas@2224:         // Survey node
nicholas@2684:         if (this.exitText !== null) {
nicholas@2224:             var exitTextNode = RootDocument.createElement('exitText');
nicholas@2224:             exitTextNode.textContent = this.exitText;
nicholas@2224:             setup.appendChild(exitTextNode);
nicholas@2224:         }
nicholas@3100:         setup.appendChild(this.calibration.encode(RootDocument));
nicholas@2224:         setup.appendChild(this.preTest.encode(RootDocument));
nicholas@2224:         setup.appendChild(this.postTest.encode(RootDocument));
nicholas@2224:         setup.appendChild(this.metrics.encode(RootDocument));
nicholas@2224:         setup.appendChild(this.interfaces.encode(RootDocument));
nicholas@2684:         this.pages.forEach(function (page) {
nicholas@2224:             root.appendChild(page.encode(RootDocument));
nicholas@2684:         });
nicholas@2538:         return RootDocument;
nicholas@2538:     };
nicholas@2538: 
nicholas@3100:     this.calibration = (function () {
nicholas@3100:         var frequencies = false,
nicholas@3100:             levels = false,
nicholas@3100:             channels = false,
nicholas@3100:             schema = undefined;
nicholas@3100:         var Calibration = {};
nicholas@3100:         Object.defineProperties(Calibration, {
nicholas@3100:             "parent": {
nicholas@3100:                 "value": this
nicholas@3100:             },
nicholas@3100:             "schema": {
nicholas@3100:                 "get": function () {
nicholas@3100:                     return schema;
nicholas@3100:                 },
nicholas@3100:                 "set": function (t) {
nicholas@3100:                     if (schema === undefined) {
nicholas@3100:                         schema = t;
nicholas@3100:                     } else {
nicholas@3100:                         throw ("Cannot set readonly");
nicholas@3100:                     }
nicholas@3100:                 }
nicholas@3100:             },
nicholas@3100:             "checkFrequencies": {
nicholas@3100:                 "get": function () {
nicholas@3100:                     return frequencies;
nicholas@3100:                 },
nicholas@3100:                 "set": function (t) {
nicholas@3100:                     frequencies = (t === true);
nicholas@3100:                 }
nicholas@3100:             },
nicholas@3100:             "checkLevels": {
nicholas@3100:                 "get": function () {
nicholas@3100:                     return levels;
nicholas@3100:                 },
nicholas@3100:                 "set": function (t) {
nicholas@3100:                     levels = (t === true);
nicholas@3100:                 }
nicholas@3100:             },
nicholas@3100:             "checkChannels": {
nicholas@3100:                 "get": function () {
nicholas@3100:                     return channels;
nicholas@3100:                 },
nicholas@3100:                 "set": function (t) {
nicholas@3100:                     channels = (t === true);
nicholas@3100:                 }
nicholas@3100:             },
nicholas@3100:             "encode": {
nicholas@3100:                 "value": function (doc) {
nicholas@3100:                     var node = doc.createElement("calibration");
nicholas@3100:                     node.setAttribute("checkFrequencies", frequencies);
nicholas@3100:                     node.setAttribute("checkLevels", levels);
nicholas@3100:                     node.setAttribute("checkChannels", channels);
nicholas@3100:                     return node;
nicholas@3100:                 }
nicholas@3100:             },
nicholas@3100:             "decode": {
nicholas@3100:                 "value": function (parent, xml) {
nicholas@3100:                     this.schema = schemaRoot.querySelector("[name=calibration]");
nicholas@3100:                     var attributeMap = this.schema.querySelectorAll('attribute'),
nicholas@3100:                         i;
nicholas@3100:                     for (i in attributeMap) {
nicholas@3100:                         if (isNaN(Number(i)) === true) {
nicholas@3100:                             break;
nicholas@3100:                         }
nicholas@3100:                         var attributeName = attributeMap[i].getAttribute('name') || attributeMap[i].getAttribute('ref');
nicholas@3100:                         var projectAttr = xml.getAttribute(attributeName);
nicholas@3100:                         projectAttr = processAttribute(projectAttr, attributeMap[i]);
nicholas@3100:                         if (projectAttr !== null) {
nicholas@3100:                             this[attributeName] = projectAttr;
nicholas@3100:                         }
nicholas@3100:                     }
nicholas@3100:                 }
nicholas@3100:             }
nicholas@3100:         });
nicholas@3100:         return Calibration;
nicholas@3100:     })();
nicholas@3100: 
nicholas@2854:     function surveyNode(specification) {
nicholas@2688:         this.location = undefined;
nicholas@2538:         this.options = [];
nicholas@2688:         this.parent = undefined;
nicholas@3020:         this.showBackButton = true;
nicholas@2224:         this.specification = specification;
nicholas@2538: 
nicholas@2857:         this.addOption = function () {
nicholas@2857:             var node = new this.OptionNode(this.specification);
nicholas@2857:             this.options.push(node);
nicholas@2857:             return node;
nicholas@2859:         };
nicholas@2857: 
nicholas@2538:         this.OptionNode = function (specification) {
nicholas@2538:             this.type = undefined;
n@2582:             this.schema = undefined;
nicholas@2538:             this.id = undefined;
nicholas@2224:             this.name = undefined;
nicholas@2538:             this.mandatory = undefined;
nicholas@2538:             this.statement = undefined;
nicholas@2538:             this.boxsize = undefined;
nicholas@2538:             this.options = [];
nicholas@2538:             this.min = undefined;
nicholas@2538:             this.max = undefined;
nicholas@2774:             this.minWait = undefined;
nicholas@2538:             this.step = undefined;
nicholas@2464:             this.conditions = [];
nicholas@2538: 
nicholas@2538:             this.decode = function (parent, child) {
nicholas@2852:                 this.schema = schemaRoot.querySelector("[name=" + child.nodeName + "]");
nicholas@2852:                 var attributeMap = this.schema.querySelectorAll('attribute');
nicholas@2684:                 var i;
nicholas@2684:                 for (i in attributeMap) {
nicholas@2684:                     if (isNaN(Number(i)) === true) {
nicholas@2538:                         break;
nicholas@2538:                     }
nicholas@2538:                     var attributeName = attributeMap[i].getAttribute('name') || attributeMap[i].getAttribute('ref');
nicholas@2538:                     var projectAttr = child.getAttribute(attributeName);
nicholas@2692:                     projectAttr = processAttribute(projectAttr, attributeMap[i]);
nicholas@2687:                     if (projectAttr !== null) {
nicholas@2687:                         this[attributeName] = projectAttr;
nicholas@2538:                     }
nicholas@2538:                 }
n@2582:                 if (child.nodeName == 'surveyentry') {
n@2582:                     console.log("NOTE - Use of <surveyelement> is now deprecated. Whilst these will still work, newer nodes and tighter error checking will not be enforced");
n@2582:                     console.log("Please use the newer, type specifc nodes");
n@2582:                     if (!this.type) {
n@2582:                         throw ("Type not specified");
n@2582:                     }
n@2582:                 } else {
n@2582:                     this.type = child.nodeName.split('survey')[1];
n@2582:                 }
nicholas@2538:                 this.statement = child.getElementsByTagName('statement')[0].textContent;
nicholas@2538:                 if (this.type == "checkbox" || this.type == "radio") {
nicholas@2538:                     var children = child.getElementsByTagName('option');
nicholas@2684:                     if (children.length === null) {
nicholas@2538:                         console.log('Malformed' + child.nodeName + 'entry');
nicholas@2538:                         this.statement = 'Malformed' + child.nodeName + 'entry';
nicholas@2538:                         this.type = 'statement';
nicholas@2538:                     } else {
nicholas@2538:                         this.options = [];
nicholas@2684:                         for (i = 0; i < children.length; i++) {
nicholas@2538:                             this.options.push({
nicholas@2538:                                 name: children[i].getAttribute('name'),
nicholas@2538:                                 text: children[i].textContent
nicholas@2538:                             });
nicholas@2538:                         }
nicholas@2538:                     }
n@2582:                 } else if (this.type == "slider") {
n@2582:                     this.leftText = "";
n@2582:                     this.rightText = "";
n@2582:                     var minText = child.getElementsByTagName("minText");
n@2582:                     var maxText = child.getElementsByTagName("maxText");
n@2582:                     if (minText.length > 0) {
n@2582:                         this.leftText = minText[0].textContent;
n@2582:                     }
n@2582:                     if (maxText.length > 0) {
n@2582:                         this.rightText = maxText[0].textContent;
n@2582:                     }
nicholas@2538:                 }
nicholas@2464:                 var conditionElements = child.getElementsByTagName("conditional");
nicholas@2684:                 for (i = 0; i < conditionElements.length; i++) {
nicholas@2464:                     var condition = conditionElements[i];
nicholas@2464:                     var obj = {
nicholas@2464:                         check: condition.getAttribute("check"),
nicholas@2464:                         value: condition.getAttribute("value"),
nicholas@2464:                         jumpToOnPass: condition.getAttribute("jumpToOnPass"),
nicholas@2464:                         jumpToOnFail: condition.getAttribute("jumpToOnFail")
nicholas@2684:                     };
nicholas@2464:                     this.conditions.push(obj);
nicholas@2464:                 }
nicholas@2538:             };
nicholas@2538: 
nicholas@2538:             this.exportXML = function (doc) {
n@2583:                 var node = doc.createElement('survey' + this.type);
nicholas@2538:                 var statement = doc.createElement('statement');
nicholas@2538:                 statement.textContent = this.statement;
nicholas@2538:                 node.appendChild(statement);
nicholas@2224:                 node.id = this.id;
nicholas@2684:                 if (this.name !== undefined) {
nicholas@2538:                     node.setAttribute("name", this.name);
nicholas@2538:                 }
nicholas@2684:                 if (this.mandatory !== undefined) {
nicholas@2538:                     node.setAttribute("mandatory", this.mandatory);
nicholas@2538:                 }
nicholas@2224:                 node.id = this.id;
nicholas@2684:                 if (this.name !== undefined) {
nicholas@2538:                     node.setAttribute("name", this.name);
nicholas@2538:                 }
nicholas@2538:                 switch (this.type) {
nicholas@2224:                     case "checkbox":
nicholas@2684:                         if (this.min !== undefined) {
nicholas@2566:                             node.setAttribute("min", this.min);
nicholas@2566:                         } else {
nicholas@2566:                             node.setAttribute("min", "0");
nicholas@2566:                         }
nicholas@2684:                         if (this.max !== undefined) {
nicholas@2566:                             node.setAttribute("max", this.max);
nicholas@2566:                         } else {
nicholas@2573:                             node.setAttribute("max", "undefined");
nicholas@2686:                         } /* falls through */
nicholas@2224:                     case "radio":
nicholas@2538:                         for (var i = 0; i < this.options.length; i++) {
nicholas@2224:                             var option = this.options[i];
nicholas@2224:                             var optionNode = doc.createElement("option");
nicholas@2538:                             optionNode.setAttribute("name", option.name);
nicholas@2224:                             optionNode.textContent = option.text;
nicholas@2224:                             node.appendChild(optionNode);
nicholas@2224:                         }
nicholas@2562:                         break;
nicholas@2224:                     case "number":
nicholas@2684:                         if (this.min !== undefined) {
nicholas@2538:                             node.setAttribute("min", this.min);
nicholas@2538:                         }
nicholas@2684:                         if (this.max !== undefined) {
nicholas@2538:                             node.setAttribute("max", this.max);
nicholas@2538:                         }
nicholas@2562:                         break;
nicholas@2224:                     case "question":
nicholas@2684:                         if (this.boxsize !== undefined) {
nicholas@2538:                             node.setAttribute("boxsize", this.boxsize);
nicholas@2538:                         }
nicholas@2684:                         if (this.mandatory !== undefined) {
nicholas@2538:                             node.setAttribute("mandatory", this.mandatory);
nicholas@2538:                         }
nicholas@2562:                         break;
nicholas@2562:                     case "video":
nicholas@2684:                         if (this.mandatory !== undefined) {
nicholas@2573:                             node.setAttribute("mandatory", this.mandatory);
nicholas@2686:                         } /* falls through */
nicholas@2562:                     case "youtube":
nicholas@2684:                         if (this.url !== undefined) {
nicholas@2573:                             node.setAttribute("url", this.url);
nicholas@2573:                         }
nicholas@2562:                         break;
n@2583:                     case "slider":
n@2583:                         node.setAttribute("min", this.min);
n@2583:                         node.setAttribute("max", this.max);
n@2583:                         if (this.leftText) {
n@2583:                             var minText = doc.createElement("minText");
n@2583:                             minText.textContent = this.leftText;
n@2583:                             node.appendChild(minText);
n@2583:                         }
n@2583:                         if (this.rightText) {
n@2583:                             var maxText = doc.createElement("maxText");
n@2583:                             maxText.textContent = this.rightText;
n@2583:                             node.appendChild(maxText);
n@2583:                         }
nicholas@2686:                         break;
nicholas@2224:                     default:
nicholas@2224:                         break;
nicholas@2224:                 }
nicholas@2684:                 this.conditions.forEach(function (condition) {
nicholas@2465:                     var conditionDOM = doc.createElement("conditional");
nicholas@2538:                     conditionDOM.setAttribute("check", condition.check);
nicholas@2538:                     conditionDOM.setAttribute("value", condition.value);
nicholas@2538:                     conditionDOM.setAttribute("jumpToOnPass", condition.jumpToOnPass);
nicholas@2538:                     conditionDOM.setAttribute("jumpToOnFail", condition.jumpToOnFail);
nicholas@2465:                     node.appendChild(conditionDOM);
nicholas@2684:                 });
nicholas@2538:                 return node;
nicholas@2538:             };
nicholas@2538:         };
nicholas@2538:         this.decode = function (parent, xml) {
nicholas@2857:             this.schema = schemaRoot.querySelector('[name=survey]');
nicholas@2224:             this.parent = parent;
nicholas@2538:             this.location = xml.getAttribute('location');
nicholas@2538:             if (this.location == 'before') {
nicholas@2538:                 this.location = 'pre';
nicholas@2538:             } else if (this.location == 'after') {
nicholas@2538:                 this.location = 'post';
nicholas@2538:             }
nicholas@3020:             this.showBackButton = xml.getAttribute("showBackButton");
nicholas@3020:             if (this.showBackButton == "false") {
nicholas@3020:                 this.showBackButton = false;
nicholas@3020:             } else {
nicholas@3020:                 this.showBackButton = true;
nicholas@3020:             }
nicholas@2684:             var child = xml.firstElementChild;
n@2582:             while (child) {
nicholas@2538:                 var node = new this.OptionNode(this.specification);
n@2582:                 node.decode(parent, child);
nicholas@2538:                 this.options.push(node);
n@2582:                 child = child.nextElementSibling;
nicholas@2538:             }
nicholas@2684:             if (this.options.length === 0) {
nicholas@2257:                 console.log("Empty survey node");
nicholas@2257:                 console.log(this);
nicholas@2257:             }
nicholas@2538:         };
nicholas@2538:         this.encode = function (doc) {
nicholas@2538:             var node = doc.createElement('survey');
nicholas@2538:             node.setAttribute('location', this.location);
nicholas@3021:             node.setAttribute('showBackButton', this.showBackButton);
nicholas@2538:             for (var i = 0; i < this.options.length; i++) {
nicholas@2538:                 node.appendChild(this.options[i].exportXML(doc));
nicholas@2538:             }
nicholas@2538:             return node;
nicholas@2538:         };
nicholas@2859:     }
nicholas@2538: 
nicholas@2854:     function interfaceNode(specification) {
nicholas@2688:         this.title = undefined;
nicholas@2688:         this.name = undefined;
nicholas@2777:         this.image = undefined;
nicholas@2538:         this.options = [];
nicholas@2538:         this.scales = [];
nicholas@2854:         this.schema = undefined;
nicholas@2538: 
nicholas@2538:         this.decode = function (parent, xml) {
nicholas@2854:             this.schema = schemaRoot.querySelectorAll('[name=interface]')[1];
nicholas@2538:             this.name = xml.getAttribute('name');
nicholas@2538:             var titleNode = xml.getElementsByTagName('title');
nicholas@2538:             if (titleNode.length == 1) {
nicholas@2538:                 this.title = titleNode[0].textContent;
nicholas@2538:             }
nicholas@2538:             var interfaceOptionNodes = xml.getElementsByTagName('interfaceoption');
nicholas@2538:             // Extract interfaceoption node schema
nicholas@2852:             var interfaceOptionNodeSchema = this.schema.querySelector('[name=interfaceoption]');
nicholas@2852:             var attributeMap = interfaceOptionNodeSchema.querySelectorAll('attribute');
nicholas@2684:             var i, j;
nicholas@2684:             for (i = 0; i < interfaceOptionNodes.length; i++) {
nicholas@2538:                 var ioNode = interfaceOptionNodes[i];
nicholas@2538:                 var option = {};
nicholas@2684:                 for (j = 0; j < attributeMap.length; j++) {
nicholas@2538:                     var attributeName = attributeMap[j].getAttribute('name') || attributeMap[j].getAttribute('ref');
nicholas@2538:                     var projectAttr = ioNode.getAttribute(attributeName);
nicholas@2692:                     projectAttr = processAttribute(projectAttr, attributeMap[j]);
nicholas@2687:                     if (projectAttr !== null) {
nicholas@2688:                         option[attributeName] = projectAttr;
nicholas@2538:                     }
nicholas@2538:                 }
n@2787:                 if (option.type == "check" && ioNode.firstElementChild) {
n@2787:                     option.errorMessage = ioNode.firstElementChild.textContent;
n@2787:                 }
nicholas@2538:                 this.options.push(option);
nicholas@2538:             }
nicholas@2777:             // Get the image node
nicholas@2777:             var imageNode = xml.getElementsByTagName("image");
nicholas@2777:             if (imageNode.length == 1) {
nicholas@2777:                 this.image = imageNode[0].getAttribute("src");
nicholas@2777:             }
nicholas@2538:             // Now the scales nodes
nicholas@2538:             var scaleParent = xml.getElementsByTagName('scales');
nicholas@2538:             if (scaleParent.length == 1) {
nicholas@2538:                 scaleParent = scaleParent[0];
nicholas@2852:                 var scalelabels = scaleParent.querySelectorAll('scalelabel');
nicholas@2684:                 for (i = 0; i < scalelabels.length; i++) {
nicholas@2538:                     this.scales.push({
nicholas@2538:                         text: scalelabels[i].textContent,
nicholas@2538:                         position: Number(scalelabels[i].getAttribute('position'))
nicholas@2538:                     });
nicholas@2538:                 }
nicholas@2538:             }
nicholas@2538:         };
nicholas@2538: 
nicholas@2538:         this.encode = function (doc) {
nicholas@2538:             var node = doc.createElement("interface");
nicholas@2684:             if (typeof this.name == "string" && this.name.length > 0)
nicholas@2538:                 node.setAttribute("name", this.name);
nicholas@2243:             if (typeof this.title == "string") {
nicholas@2243:                 var titleNode = doc.createElement("title");
nicholas@2243:                 titleNode.textContent = this.title;
nicholas@2243:                 node.appendChild(titleNode);
nicholas@2243:             }
nicholas@2684:             this.options.forEach(function (option) {
nicholas@2224:                 var child = doc.createElement("interfaceoption");
nicholas@3136:                 Object.keys(option).forEach(function(key) {
nicholas@3136:                     child.setAttribute(key, option[key]);
nicholas@3136:                 });
n@2788:                 if (option.type == "check" && option.errorMessage !== undefined) {
n@2788:                     var errorMessage = doc.createElement("errormessage");
n@2788:                     errorMessage.textContent = option.errorMessage;
n@2788:                     child.appendChild(errorMessage);
n@2788:                 }
nicholas@2224:                 node.appendChild(child);
nicholas@2684:             });
nicholas@2780:             if (typeof this.image == "string" && this.image.length !== 0) {
nicholas@2780:                 var imgNode = doc.createElement("image");
nicholas@2780:                 imgNode.setAttribute("src", this.image);
nicholas@2780:                 node.appendChild(imgNode);
nicholas@2780:             }
nicholas@2684:             if (this.scales.length !== 0) {
nicholas@2224:                 var scales = doc.createElement("scales");
nicholas@2684:                 this.scales.forEach(function (scale) {
nicholas@2224:                     var child = doc.createElement("scalelabel");
nicholas@2538:                     child.setAttribute("position", scale.position);
nicholas@2224:                     child.textContent = scale.text;
nicholas@2224:                     scales.appendChild(child);
nicholas@2684:                 });
nicholas@2224:                 node.appendChild(scales);
nicholas@2224:             }
nicholas@2224:             return node;
nicholas@2538:         };
nicholas@2859:     }
nicholas@2538: 
nicholas@2854:     function metricNode() {
nicholas@2224:         this.enabled = [];
nicholas@2538:         this.decode = function (parent, xml) {
nicholas@2224:             var children = xml.getElementsByTagName('metricenable');
nicholas@2538:             for (var i in children) {
nicholas@2684:                 if (isNaN(Number(i)) === true) {
nicholas@2538:                     break;
nicholas@2538:                 }
nicholas@2224:                 this.enabled.push(children[i].textContent);
nicholas@2224:             }
nicholas@2684:         };
nicholas@2538:         this.encode = function (doc) {
nicholas@2224:             var node = doc.createElement('metric');
nicholas@2538:             for (var i in this.enabled) {
nicholas@2684:                 if (isNaN(Number(i)) === true) {
nicholas@2538:                     break;
nicholas@2538:                 }
nicholas@2224:                 var child = doc.createElement('metricenable');
nicholas@2224:                 child.textContent = this.enabled[i];
nicholas@2224:                 node.appendChild(child);
nicholas@2224:             }
nicholas@2224:             return node;
nicholas@2684:         };
nicholas@2859:     }
nicholas@2538: 
nicholas@2854:     function page(specification) {
nicholas@2538:         this.presentedId = undefined;
nicholas@2538:         this.id = undefined;
nicholas@2470:         this.title = undefined;
nicholas@2538:         this.hostURL = undefined;
nicholas@2538:         this.randomiseOrder = undefined;
nicholas@2538:         this.loop = undefined;
nicholas@2688:         this.outsideReference = undefined;
nicholas@2688:         this.loudness = undefined;
nicholas@2688:         this.label = undefined;
nicholas@2688:         this.labelStart = undefined;
nicholas@2857:         this.preTest = new surveyNode(specification);
nicholas@2857:         this.postTest = new surveyNode(specification);
nicholas@2866:         this.preTest.location = "pre";
nicholas@2866:         this.postTest.location = "post";
nicholas@2538:         this.interfaces = [];
nicholas@2688:         this.playOne = undefined;
nicholas@2688:         this.restrictMovement = undefined;
n@2713:         this.position = undefined;
nicholas@2538:         this.commentBoxPrefix = "Comment on track";
nicholas@2822:         this.minNumberPlays = undefined;
nicholas@2822:         this.maxNumberPlays = undefined;
nicholas@3062:         this.randomiseAxisOrder = undefined;
nicholas@2538:         this.audioElements = [];
nicholas@2538:         this.commentQuestions = [];
nicholas@2852:         this.schema = schemaRoot.querySelector("[name=page]");
nicholas@2224:         this.specification = specification;
nicholas@2688:         this.parent = undefined;
nicholas@2538: 
nicholas@2859:         this.addInterface = function () {
nicholas@2859:             var node = new interfaceNode(specification);
nicholas@2859:             this.interfaces.push(node);
nicholas@2859:             return node;
nicholas@2859:         };
nicholas@2859:         this.addCommentQuestion = function () {
nicholas@2859:             var node = new commentQuestionNode(specification);
nicholas@2859:             this.commentQuestions.push(node);
nicholas@2859:             return node;
nicholas@2859:         };
nicholas@2859:         this.addAudioElement = function () {
nicholas@2859:             var node = new audioElementNode(specification);
nicholas@2859:             this.audioElements.push(node);
nicholas@2859:             return node;
nicholas@2859:         };
nicholas@2859: 
nicholas@2538:         this.decode = function (parent, xml) {
nicholas@2224:             this.parent = parent;
nicholas@2852:             var attributeMap = this.schema.querySelectorAll('attribute');
nicholas@2684:             var i, node;
nicholas@2684:             for (i = 0; i < attributeMap.length; i++) {
nicholas@2538:                 var attributeName = attributeMap[i].getAttribute('name') || attributeMap[i].getAttribute('ref');
nicholas@2538:                 var projectAttr = xml.getAttribute(attributeName);
nicholas@2692:                 projectAttr = processAttribute(projectAttr, attributeMap[i]);
nicholas@2687:                 if (projectAttr !== null) {
nicholas@2687:                     this[attributeName] = projectAttr;
nicholas@2538:                 }
nicholas@2538:             }
nicholas@2538: 
nicholas@2470:             // Get the title
nicholas@2470:             var title = xml.getElementsByTagName('title');
nicholas@2684:             if (title.length !== 0 && title[0].parentElement == xml) {
nicholas@2470:                 this.title = title[0].textContent;
nicholas@2470:             }
nicholas@2538: 
nicholas@2538:             // Get the Comment Box Prefix
nicholas@2538:             var CBP = xml.getElementsByTagName('commentboxprefix');
nicholas@2684:             if (CBP.length !== 0 && CBP[0].parentElement == xml) {
nicholas@2538:                 this.commentBoxPrefix = CBP[0].textContent;
nicholas@2538:             }
nicholas@2538: 
nicholas@2538:             // Now decode the interfaces
nicholas@2854:             var interfaceNodes = xml.getElementsByTagName('interface');
nicholas@2854:             for (i = 0; i < interfaceNodes.length; i++) {
nicholas@2854:                 node = new interfaceNode(this.specification);
nicholas@2854:                 node.decode(this, interfaceNodes[i], parent.schema.querySelectorAll('[name=interface]')[1]);
nicholas@2538:                 this.interfaces.push(node);
nicholas@2538:             }
nicholas@2538: 
nicholas@2538:             // Now process the survey node options
nicholas@2538:             var survey = xml.getElementsByTagName('survey');
nicholas@2852:             var surveySchema = parent.schema.querySelector('[name=survey]');
nicholas@2684:             for (i = 0; i < survey.length; i++) {
nicholas@2538:                 var location = survey[i].getAttribute('location');
nicholas@2538:                 if (location == 'pre' || location == 'before') {
nicholas@2857:                     if (this.preTest.options.length !== 0) {
nicholas@2538:                         this.errors.push("Already a pre/before test survey defined! Ignoring second!!");
nicholas@2538:                     } else {
nicholas@2538:                         this.preTest.decode(parent, survey[i], surveySchema);
nicholas@2538:                     }
nicholas@2538:                 } else if (location == 'post' || location == 'after') {
nicholas@2857:                     if (this.postTest.options.length !== 0) {
nicholas@2538:                         this.errors.push("Already a post/after test survey defined! Ignoring second!!");
nicholas@2538:                     } else {
nicholas@2538:                         this.postTest.decode(parent, survey[i], surveySchema);
nicholas@2538:                     }
nicholas@2538:                 }
nicholas@2538:             }
nicholas@2538: 
nicholas@2538:             // Now process the audioelement tags
nicholas@2538:             var audioElements = xml.getElementsByTagName('audioelement');
nicholas@2684:             for (i = 0; i < audioElements.length; i++) {
nicholas@2854:                 var audioNode = new audioElementNode(this.specification);
nicholas@2684:                 audioNode.decode(this, audioElements[i]);
nicholas@2684:                 this.audioElements.push(audioNode);
nicholas@2538:             }
nicholas@2538: 
nicholas@2538:             // Now decode the commentquestions
n@2579:             var cqNode = xml.getElementsByTagName('commentquestions');
nicholas@2684:             if (cqNode.length !== 0) {
n@2579:                 cqNode = cqNode[0];
nicholas@2644:                 var commentQuestion = cqNode.firstElementChild;
nicholas@2644:                 while (commentQuestion) {
nicholas@2854:                     node = new commentQuestionNode(this.specification);
nicholas@2644:                     node.decode(parent, commentQuestion);
n@2579:                     this.commentQuestions.push(node);
nicholas@2644:                     commentQuestion = commentQuestion.nextElementSibling;
n@2579:                 }
nicholas@2538:             }
nicholas@2538:         };
nicholas@2538: 
nicholas@2538:         this.encode = function (root) {
nicholas@2538:             var AHNode = root.createElement("page");
nicholas@2224:             // First decode the attributes
nicholas@2852:             var attributes = this.schema.querySelectorAll('attribute');
nicholas@2684:             var i;
nicholas@2684:             for (i = 0; i < attributes.length; i++) {
nicholas@2224:                 var name = attributes[i].getAttribute("name");
nicholas@2688:                 if (name === null) {
nicholas@2224:                     name = attributes[i].getAttribute("ref");
nicholas@2224:                 }
nicholas@2685:                 if (this[name] !== undefined || attributes[i].getAttribute("use") == "required") {
nicholas@2685:                     AHNode.setAttribute(name, this[name]);
nicholas@2224:                 }
nicholas@2224:             }
nicholas@2224:             // <commentboxprefix>
nicholas@2224:             var commentboxprefix = root.createElement("commentboxprefix");
nicholas@2224:             commentboxprefix.textContent = this.commentBoxPrefix;
nicholas@2224:             AHNode.appendChild(commentboxprefix);
nicholas@2538: 
nicholas@2684:             for (i = 0; i < this.interfaces.length; i++) {
nicholas@2538:                 AHNode.appendChild(this.interfaces[i].encode(root));
nicholas@2538:             }
nicholas@2538: 
nicholas@2684:             for (i = 0; i < this.audioElements.length; i++) {
nicholas@2538:                 AHNode.appendChild(this.audioElements[i].encode(root));
nicholas@2538:             }
nicholas@2538:             // Create <CommentQuestion>
nicholas@3036:             if (this.commentQuestions.length > 0) {
nicholas@3036:                 var node = root.createElement("commentquestions");
nicholas@3036:                 for (i = 0; i < this.commentQuestions.length; i++) {
nicholas@3036:                     node.appendChild(this.commentQuestions[i].encode(root));
nicholas@3036:                 }
nicholas@3036:                 AHNode.appendChild(node);
nicholas@2538:             }
nicholas@2538: 
nicholas@2538:             AHNode.appendChild(this.preTest.encode(root));
nicholas@2224:             AHNode.appendChild(this.postTest.encode(root));
nicholas@2538:             return AHNode;
nicholas@2538:         };
nicholas@2538: 
nicholas@2854:         function commentQuestionNode(specification) {
nicholas@2688:             this.id = undefined;
nicholas@2224:             this.name = undefined;
nicholas@2538:             this.type = undefined;
nicholas@2538:             this.statement = undefined;
nicholas@3034:             this.mandatory = undefined;
nicholas@2852:             this.schema = schemaRoot.querySelector('[name=commentquestion]');
nicholas@2538:             this.decode = function (parent, xml) {
nicholas@2538:                 this.id = xml.id;
nicholas@2224:                 this.name = xml.getAttribute('name');
nicholas@3034:                 this.mandatory = xml.getAttribute("mandatory") == "true";
nicholas@2688:                 if (this.name === null) {
nicholas@2688:                     this.name = undefined;
nicholas@2688:                 }
n@2579:                 switch (xml.nodeName) {
n@2579:                     case "commentradio":
n@2579:                         this.type = "radio";
n@2579:                         this.options = [];
n@2579:                         break;
n@2579:                     case "commentcheckbox":
n@2579:                         this.type = "checkbox";
n@2579:                         this.options = [];
n@2579:                         break;
n@2579:                     case "commentslider":
n@2579:                         this.type = "slider";
n@2579:                         this.min = undefined;
n@2579:                         this.max = undefined;
n@2579:                         this.step = undefined;
n@2579:                         break;
n@2579:                     case "commentquestion":
n@2579:                         this.type = "question";
n@2579:                         break;
nicholas@2686:                     default:
nicholas@2686:                         throw ("Unknown comment type " + xml.nodeName);
n@2579:                 }
nicholas@2538:                 this.statement = xml.getElementsByTagName('statement')[0].textContent;
n@2579:                 if (this.type == "radio" || this.type == "checkbox") {
n@2579:                     var optNodes = xml.getElementsByTagName('option');
n@2579:                     for (var i = 0; i < optNodes.length; i++) {
n@2579:                         var optNode = optNodes[i];
n@2579:                         this.options.push({
n@2579:                             name: optNode.getAttribute('name'),
n@2579:                             text: optNode.textContent
n@2579:                         });
n@2579:                     }
n@2579:                 }
n@2579:                 if (this.type == "slider") {
n@2579:                     this.min = Number(xml.getAttribute("min"));
n@2579:                     this.max = Number(xml.getAttribute("max"));
n@2579:                     this.step = Number(xml.getAttribute("step"));
nicholas@2684:                     if (this.step === undefined) {
n@2579:                         this.step = 1;
n@2579:                     }
n@2579:                     this.value = Number(xml.getAttribute("value"));
nicholas@2684:                     if (this.value === undefined) {
nicholas@2684:                         this.value = this.min;
n@2579:                     }
n@2580:                     this.leftText = xml.getElementsByTagName("minText");
n@2580:                     if (this.leftText && this.leftText.length > 0) {
n@2580:                         this.leftText = this.leftText[0].textContent;
n@2580:                     } else {
n@2580:                         this.leftText = "";
n@2580:                     }
n@2580:                     this.rightText = xml.getElementsByTagName("maxText");
n@2580:                     if (this.rightText && this.rightText.length > 0) {
n@2580:                         this.rightText = this.rightText[0].textContent;
n@2580:                     } else {
n@2580:                         this.rightText = "";
n@2580:                     }
nicholas@2538:                 }
nicholas@2538:             };
nicholas@2538: 
nicholas@2538:             this.encode = function (root) {
n@2579:                 var node;
n@2579:                 switch (this.type) {
n@2579:                     case "radio":
n@2579:                         node = root.createElement("commentradio");
n@2579:                         break;
n@2579:                     case "checkbox":
n@2579:                         node = root.createElement("commentcheckbox");
n@2579:                         break;
n@2579:                     case "slider":
n@2579:                         node = root.createElement("commentslider");
n@2579:                         break;
n@2579:                     case "question":
n@2579:                         node = root.createElement("commentquestion");
n@2579:                         break;
nicholas@2686:                     default:
nicholas@2686:                         throw ("Unknown type " + this.type);
n@2579:                 }
nicholas@2224:                 node.id = this.id;
nicholas@3036:                 node.setAttribute("mandatory", this.mandatory);
nicholas@2538:                 node.setAttribute("type", this.type);
nicholas@2684:                 if (this.name !== undefined) {
nicholas@2538:                     node.setAttribute("name", this.name);
nicholas@2538:                 }
nicholas@2224:                 var statement = root.createElement("statement");
nicholas@2224:                 statement.textContent = this.statement;
nicholas@2224:                 node.appendChild(statement);
n@2579:                 if (this.type == "radio" || this.type == "checkbox") {
nicholas@2684:                     this.options.forEach(function (option) {
n@2579:                         var child = root.createElement("option");
n@2579:                         child.setAttribute("name", option.name);
n@2579:                         child.textContent = option.text;
n@2579:                         node.appendChild(child);
nicholas@2684:                     });
n@2579:                 }
n@2579:                 if (this.type == "slider") {
n@2579:                     node.setAttribute("min", this.min);
n@2579:                     node.setAttribute("max", this.max);
n@2579:                     if (this.step !== 1) {
n@2579:                         node.setAttribute("step", this.step);
n@2579:                     }
n@2579:                     if (this.value !== this.min) {
n@2579:                         node.setAttribute("value", this.value);
n@2579:                     }
n@2580:                     if (this.leftText.length > 0) {
n@2580:                         var leftText = root.createElement("minText");
n@2580:                         leftText.textContent = this.leftText;
n@2580:                         node.appendChild(leftText);
n@2580:                     }
n@2580:                     if (this.rightText.length > 0) {
n@2580:                         var rightText = root.createElement("maxText");
n@2580:                         rightText.textContent = this.rightText;
n@2580:                         node.appendChild(rightText);
n@2580:                     }
nicholas@2224:                 }
nicholas@2224:                 return node;
nicholas@2538:             };
nicholas@2859:         }
nicholas@2538: 
nicholas@2854:         function audioElementNode(specification) {
nicholas@2688:             this.url = undefined;
nicholas@2688:             this.id = undefined;
nicholas@2688:             this.name = undefined;
nicholas@2688:             this.parent = undefined;
nicholas@2688:             this.type = undefined;
nicholas@2688:             this.marker = undefined;
nicholas@2538:             this.enforce = false;
nicholas@2538:             this.gain = 0.0;
nicholas@2688:             this.label = undefined;
nicholas@2460:             this.startTime = undefined;
nicholas@2460:             this.stopTime = undefined;
nicholas@2614:             this.sampleRate = undefined;
nicholas@2777:             this.image = undefined;
nicholas@2822:             this.minNumberPlays = undefined;
nicholas@2822:             this.maxNumberPlays = undefined;
nicholas@2614:             this.alternatives = [];
nicholas@2852:             this.schema = schemaRoot.querySelector('[name=audioelement]');
nicholas@2688:             this.parent = undefined;
nicholas@2538:             this.decode = function (parent, xml) {
nicholas@2538:                 this.parent = parent;
nicholas@2852:                 var attributeMap = this.schema.querySelectorAll('attribute');
nicholas@2538:                 for (var i = 0; i < attributeMap.length; i++) {
nicholas@2538:                     var attributeName = attributeMap[i].getAttribute('name') || attributeMap[i].getAttribute('ref');
nicholas@2538:                     var projectAttr = xml.getAttribute(attributeName);
nicholas@2692:                     projectAttr = processAttribute(projectAttr, attributeMap[i]);
nicholas@2687:                     if (projectAttr !== null) {
nicholas@2687:                         this[attributeName] = projectAttr;
nicholas@2538:                     }
nicholas@2538:                 }
nicholas@2614:                 // Get the alternative nodes
nicholas@2614:                 var child = xml.firstElementChild;
nicholas@2614:                 while (child) {
nicholas@2614:                     if (child.nodeName == "alternative") {
nicholas@2614:                         this.alternatives.push({
nicholas@2614:                             'url': child.getAttribute("url"),
nicholas@2614:                             'sampleRate': child.getAttribute("sampleRate")
nicholas@2614:                         });
nicholas@2614:                     }
nicholas@2614:                     child = child.nextElementSibling;
nicholas@2614:                 }
nicholas@2538: 
nicholas@2538:             };
nicholas@2538:             this.encode = function (root) {
nicholas@2538:                 var AENode = root.createElement("audioelement");
nicholas@2852:                 var attributes = this.schema.querySelectorAll('attribute');
nicholas@2538:                 for (var i = 0; i < attributes.length; i++) {
nicholas@2224:                     var name = attributes[i].getAttribute("name");
nicholas@2688:                     if (name === null) {
nicholas@2224:                         name = attributes[i].getAttribute("ref");
nicholas@2224:                     }
nicholas@2685:                     if (this[name] !== undefined || attributes[i].getAttribute("use") == "required") {
nicholas@2685:                         AENode.setAttribute(name, this[name]);
nicholas@2224:                     }
nicholas@2224:                 }
nicholas@2614:                 this.alternatives.forEach(function (alt) {
nicholas@2614:                     var node = root.createElement("alternative");
nicholas@2614:                     node.setAttribute("url", alt.url);
nicholas@2614:                     node.setAttribute("sampleRate", alt.sampleRate);
nicholas@2614:                     AENode.appendChild(node);
nicholas@2614:                 });
nicholas@2538:                 return AENode;
nicholas@2538:             };
nicholas@2859:         }
nicholas@2859:     }
b@2437: }