function compileSchema(type) {
		var schema = {}, globalAttributes, blockContent;
		var phrasingContent, flowContent, html4BlockContent, html4PhrasingContent;

		function add(name, attributes, children) {
			var ni, i, attributesOrder, args = arguments;

			function arrayToMap(array, obj) {
				var map = {}, i, l;

				for (i = 0, l = array.length; i < l; i++) {
					map[array[i]] = obj || {};
				}

				return map;
			}

			children = children || [];
			attributes = attributes || "";

			if (typeof children === "string") {
				children = split(children);
			}

			// Split string children
			for (i = 3; i < args.length; i++) {
				if (typeof args[i] === "string") {
					args[i] = split(args[i]);
				}

				children.push.apply(children, args[i]);
			}

			name = split(name);
			ni = name.length;
			while (ni--) {
				attributesOrder = [].concat(globalAttributes, split(attributes));
				schema[name[ni]] = {
					attributes: arrayToMap(attributesOrder),
					attributesOrder: attributesOrder,
					children: arrayToMap(children, dummyObj)
				};
			}
		}

		function addAttrs(name, attributes) {
			var ni, schemaItem, i, l;

			name = split(name);
			ni = name.length;
			attributes = split(attributes);
			while (ni--) {
				schemaItem = schema[name[ni]];
				for (i = 0, l = attributes.length; i < l; i++) {
					schemaItem.attributes[attributes[i]] = {};
					schemaItem.attributesOrder.push(attributes[i]);
				}
			}
		}

		// Use cached schema
		if (mapCache[type]) {
			return mapCache[type];
		}

		// Attributes present on all elements
		globalAttributes = split("id accesskey class dir lang style tabindex title");

		// Event attributes can be opt-in/opt-out
		/*eventAttributes = split("onabort onblur oncancel oncanplay oncanplaythrough onchange onclick onclose oncontextmenu oncuechange " +
				"ondblclick ondrag ondragend ondragenter ondragleave ondragover ondragstart ondrop ondurationchange onemptied onended " +
				"onerror onfocus oninput oninvalid onkeydown onkeypress onkeyup onload onloadeddata onloadedmetadata onloadstart " +
				"onmousedown onmousemove onmouseout onmouseover onmouseup onmousewheel onpause onplay onplaying onprogress onratechange " +
				"onreset onscroll onseeked onseeking onseeking onselect onshow onstalled onsubmit onsuspend ontimeupdate onvolumechange " +
				"onwaiting"
		);*/

		// Block content elements
		blockContent = split(
			"address blockquote div dl fieldset form h1 h2 h3 h4 h5 h6 hr menu ol p pre table ul"
		);

		// Phrasing content elements from the HTML5 spec (inline)
		phrasingContent = split(
			"a abbr b bdo br button cite code del dfn em embed i iframe img input ins kbd " +
			"label map noscript object q s samp script select small span strong sub sup " +
			"textarea u var #text #comment"
		);

		// Add HTML5 items to globalAttributes, blockContent, phrasingContent
		if (type != "html4") {
			globalAttributes.push.apply(globalAttributes, split("contenteditable contextmenu draggable dropzone " +
				"hidden spellcheck translate"));
			blockContent.push.apply(blockContent, split("article aside details dialog figure header footer hgroup section nav"));
			phrasingContent.push.apply(phrasingContent, split("audio canvas command datalist mark meter output picture " +
				"progress time wbr video ruby bdi keygen"));
		}

		// Add HTML4 elements unless it's html5-strict
		if (type != "html5-strict") {
			globalAttributes.push("xml:lang");

			html4PhrasingContent = split("acronym applet basefont big font strike tt");
			phrasingContent.push.apply(phrasingContent, html4PhrasingContent);

			each(html4PhrasingContent, function(name) {
				add(name, "", phrasingContent);
			});

			html4BlockContent = split("center dir isindex noframes");
			blockContent.push.apply(blockContent, html4BlockContent);

			// Flow content elements from the HTML5 spec (block+inline)
			flowContent = [].concat(blockContent, phrasingContent);

			each(html4BlockContent, function(name) {
				add(name, "", flowContent);
			});
		}

		// Flow content elements from the HTML5 spec (block+inline)
		flowContent = flowContent || [].concat(blockContent, phrasingContent);

		// HTML4 base schema TODO: Move HTML5 specific attributes to HTML5 specific if statement
		// Schema items <element name>, <specific attributes>, <children ..>
		add("html", "manifest", "head body");
		add("head", "", "base command link meta noscript script style title");
		add("title hr noscript br");
		add("base", "href target");
		add("link", "href rel media hreflang type sizes hreflang");
		add("meta", "name http-equiv content charset");
		add("style", "media type scoped");
		add("script", "src async defer type charset");
		add("body", "onafterprint onbeforeprint onbeforeunload onblur onerror onfocus " +
				"onhashchange onload onmessage onoffline ononline onpagehide onpageshow " +
				"onpopstate onresize onscroll onstorage onunload", flowContent);
		add("address dt dd div caption", "", flowContent);
		add("h1 h2 h3 h4 h5 h6 pre p abbr code var samp kbd sub sup i b u bdo span legend em strong small s cite dfn", "", phrasingContent);
		add("blockquote", "cite", flowContent);
		add("ol", "reversed start type", "li");
		add("ul", "", "li");
		add("li", "value", flowContent);
		add("dl", "", "dt dd");
		add("a", "href target rel media hreflang type", phrasingContent);
		add("q", "cite", phrasingContent);
		add("ins del", "cite datetime", flowContent);
		add("img", "src sizes srcset alt usemap ismap width height");
		add("iframe", "src name width height", flowContent);
		add("embed", "src type width height");
		add("object", "data type typemustmatch name usemap form width height", flowContent, "param");
		add("param", "name value");
		add("map", "name", flowContent, "area");
		add("area", "alt coords shape href target rel media hreflang type");
		add("table", "border", "caption colgroup thead tfoot tbody tr" + (type == "html4" ? " col" : ""));
		add("colgroup", "span", "col");
		add("col", "span");
		add("tbody thead tfoot", "", "tr");
		add("tr", "", "td th");
		add("td", "colspan rowspan headers", flowContent);
		add("th", "colspan rowspan headers scope abbr", flowContent);
		add("form", "accept-charset action autocomplete enctype method name novalidate target", flowContent);
		add("fieldset", "disabled form name", flowContent, "legend");
		add("label", "form for", phrasingContent);
		add("input", "accept alt autocomplete checked dirname disabled form formaction formenctype formmethod formnovalidate " +
				"formtarget height list max maxlength min multiple name pattern readonly required size src step type value width"
		);
		add("button", "disabled form formaction formenctype formmethod formnovalidate formtarget name type value",
			type == "html4" ? flowContent : phrasingContent);
		add("select", "disabled form multiple name required size", "option optgroup");
		add("optgroup", "disabled label", "option");
		add("option", "disabled label selected value");
		add("textarea", "cols dirname disabled form maxlength name readonly required rows wrap");
		add("menu", "type label", flowContent, "li");
		add("noscript", "", flowContent);

		// Extend with HTML5 elements
		if (type != "html4") {
			add("wbr");
			add("ruby", "", phrasingContent, "rt rp");
			add("figcaption", "", flowContent);
			add("mark rt rp summary bdi", "", phrasingContent);
			add("canvas", "width height", flowContent);
			add("video", "src crossorigin poster preload autoplay mediagroup loop " +
				"muted controls width height buffered", flowContent, "track source");
			add("audio", "src crossorigin preload autoplay mediagroup loop muted controls buffered volume", flowContent, "track source");
			add("picture", "", "img source");
			add("source", "src srcset type media sizes");
			add("track", "kind src srclang label default");
			add("datalist", "", phrasingContent, "option");
			add("article section nav aside header footer", "", flowContent);
			add("hgroup", "", "h1 h2 h3 h4 h5 h6");
			add("figure", "", flowContent, "figcaption");
			add("time", "datetime", phrasingContent);
			add("dialog", "open", flowContent);
			add("command", "type label icon disabled checked radiogroup command");
			add("output", "for form name", phrasingContent);
			add("progress", "value max", phrasingContent);
			add("meter", "value min max low high optimum", phrasingContent);
			add("details", "open", flowContent, "summary");
			add("keygen", "autofocus challenge disabled form keytype name");
		}

		// Extend with HTML4 attributes unless it's html5-strict
		if (type != "html5-strict") {
			addAttrs("script", "language xml:space");
			addAttrs("style", "xml:space");
			addAttrs("object", "declare classid code codebase codetype archive standby align border hspace vspace");
			addAttrs("embed", "align name hspace vspace");
			addAttrs("param", "valuetype type");
			addAttrs("a", "charset name rev shape coords");
			addAttrs("br", "clear");
			addAttrs("applet", "codebase archive code object alt name width height align hspace vspace");
			addAttrs("img", "name longdesc align border hspace vspace");
			addAttrs("iframe", "longdesc frameborder marginwidth marginheight scrolling align");
			addAttrs("font basefont", "size color face");
			addAttrs("input", "usemap align");
			addAttrs("select", "onchange");
			addAttrs("textarea");
			addAttrs("h1 h2 h3 h4 h5 h6 div p legend caption", "align");
			addAttrs("ul", "type compact");
			addAttrs("li", "type");
			addAttrs("ol dl menu dir", "compact");
			addAttrs("pre", "width xml:space");
			addAttrs("hr", "align noshade size width");
			addAttrs("isindex", "prompt");
			addAttrs("table", "summary width frame rules cellspacing cellpadding align bgcolor");
			addAttrs("col", "width align char charoff valign");
			addAttrs("colgroup", "width align char charoff valign");
			addAttrs("thead", "align char charoff valign");
			addAttrs("tr", "align char charoff valign bgcolor");
			addAttrs("th", "axis align char charoff valign nowrap bgcolor width height");
			addAttrs("form", "accept");
			addAttrs("td", "abbr axis scope align char charoff valign nowrap bgcolor width height");
			addAttrs("tfoot", "align char charoff valign");
			addAttrs("tbody", "align char charoff valign");
			addAttrs("area", "nohref");
			addAttrs("body", "background bgcolor text link vlink alink");
		}

		// Extend with HTML5 attributes unless it's html4
		if (type != "html4") {
			addAttrs("input button select textarea", "autofocus");
			addAttrs("input textarea", "placeholder");
			addAttrs("a", "download");
			addAttrs("link script img", "crossorigin");
			addAttrs("iframe", "sandbox seamless allowfullscreen"); // Excluded: srcdoc
		}

		// Special: iframe, ruby, video, audio, label

		// Delete children of the same name from it's parent
		// For example: form can't have a child of the name form
		each(split('a form meter progress dfn'), function(name) {
			if (schema[name]) {
				delete schema[name].children[name];
			}
		});

		// Delete header, footer, sectioning and heading content descendants
		/*each('dt th address', function(name) {
			delete schema[name].children[name];
		});*/

		// Caption can't have tables
		delete schema.caption.children.table;

		// Delete scripts by default due to possible XSS
		delete schema.script;

		// TODO: LI:s can only have value if parent is OL

		// TODO: Handle transparent elements
		// a ins del canvas map

		mapCache[type] = schema;

		return schema;
	}
Builds a schema lookup table

@private
@param {String} type html4, html5 or html5-strict schema type.
@return {Object} Schema lookup table.