text: var attregexg=/([\w:]+)=((?:")([^"]*)(?:")|(?:')([^']*)(?:'))/g;
  var tagregex=/<[^>]*>/g;
  var nsregex=/<\w*:/, nsregex2 = /<(\/?)\w+:/;
  function parsexmltag(tag, skip_root) {
  	var z = [];
  	var eq = 0, c = 0;
  	for(; eq !== tag.length; ++eq) if((c = tag.charCodeAt(eq)) === 32 || c === 10 || c === 13) break;
  	if(!skip_root) z[0] = tag.substr(0, eq);
  	if(eq === tag.length) return z;
  	var m = tag.match(attregexg), j=0, w="", v="", i=0, q="", cc="";
  	if(m) for(i = 0; i != m.length; ++i) {
  		cc = m[i];
  		for(c=0; c != cc.length; ++c) if(cc.charCodeAt(c) === 61) break;
  		q = cc.substr(0,c); v = cc.substring(c+2, cc.length-1);
  		for(j=0;j!=q.length;++j) if(q.charCodeAt(j) === 58) break;
  		if(j===q.length) z[q] = v;
  		else z[(j===5 && q.substr(0,5)==="xmlns"?"xmlns":"")+q.substr(j+1)] = v;
  	}
  	return z;
  }
  function strip_ns(x) { return x.replace(nsregex2, "<$1"); }
  
  var encodings = {
  	'&quot;': '"',
  	'&apos;': "'",
  	'&gt;': '>',
  	'&lt;': '<',
  	'&amp;': '&'
  };
  var rencoding = evert(encodings);
  var rencstr = "&<>'\"".split("");
  
  // TODO: CP remap (need to read file version to determine OS)
  var unescapexml = (function() {
  	var encregex = /&[a-z]*;/g, coderegex = /_x([\da-fA-F]+)_/g;
  	return function unescapexml(text){
  		var s = text + '';
  		return s.replace(encregex, function($$) { return encodings[$$]; }).replace(coderegex,function(m,c) {return String.fromCharCode(parseInt(c,16));});
  	};
  })();
  
  var decregex=/[&<>'"]/g, charegex = /[\u0000-\u0008\u000b-\u001f]/g;
  function escapexml(text){
  	var s = text + '';
  	return s.replace(decregex, function(y) { return rencoding[y]; }).replace(charegex,function(s) { return "_x" + ("000"+s.charCodeAt(0).toString(16)).substr(-4) + "_";});
  }
  
  /* TODO: handle codepages */
  var xlml_fixstr = (function() {
  	var entregex = /&#(\d+);/g;
  	function entrepl($$,$1) { return String.fromCharCode(parseInt($1,10)); }
  	return function xlml_fixstr(str) { return str.replace(entregex,entrepl); };
  })();
  
  function parsexmlbool(value, tag) {
  	switch(value) {
  		case '1': case 'true': case 'TRUE': return true;
  		/* case '0': case 'false': case 'FALSE':*/
  		default: return false;
  	}
  }
  
  var utf8read = function utf8reada(orig) {
  	var out = "", i = 0, c = 0, d = 0, e = 0, f = 0, w = 0;
  	while (i < orig.length) {
  		c = orig.charCodeAt(i++);
  		if (c < 128) { out += String.fromCharCode(c); continue; }
  		d = orig.charCodeAt(i++);
  		if (c>191 && c<224) { out += String.fromCharCode(((c & 31) << 6) | (d & 63)); continue; }
  		e = orig.charCodeAt(i++);
  		if (c < 240) { out += String.fromCharCode(((c & 15) << 12) | ((d & 63) << 6) | (e & 63)); continue; }
  		f = orig.charCodeAt(i++);
  		w = (((c & 7) << 18) | ((d & 63) << 12) | ((e & 63) << 6) | (f & 63))-65536;
  		out += String.fromCharCode(0xD800 + ((w>>>10)&1023));
  		out += String.fromCharCode(0xDC00 + (w&1023));
  	}
  	return out;
  };
  
  
  if(has_buf) {
  	var utf8readb = function utf8readb(data) {
  		var out = new Buffer(2*data.length), w, i, j = 1, k = 0, ww=0, c;
  		for(i = 0; i < data.length; i+=j) {
  			j = 1;
  			if((c=data.charCodeAt(i)) < 128) w = c;
  			else if(c < 224) { w = (c&31)*64+(data.charCodeAt(i+1)&63); j=2; }
  			else if(c < 240) { w=(c&15)*4096+(data.charCodeAt(i+1)&63)*64+(data.charCodeAt(i+2)&63); j=3; }
  			else { j = 4;
  				w = (c & 7)*262144+(data.charCodeAt(i+1)&63)*4096+(data.charCodeAt(i+2)&63)*64+(data.charCodeAt(i+3)&63);
  				w -= 65536; ww = 0xD800 + ((w>>>10)&1023); w = 0xDC00 + (w&1023);
  			}
  			if(ww !== 0) { out[k++] = ww&255; out[k++] = ww>>>8; ww = 0; }
  			out[k++] = w%256; out[k++] = w>>>8;
  		}
  		out.length = k;
  		return out.toString('ucs2');
  	};
  	var corpus = "foo bar baz\u00e2\u0098\u0083\u00f0\u009f\u008d\u00a3";
  	if(utf8read(corpus) == utf8readb(corpus)) utf8read = utf8readb;
  	var utf8readc = function utf8readc(data) { return Buffer(data, 'binary').toString('utf8'); };
  	if(utf8read(corpus) == utf8readc(corpus)) utf8read = utf8readc;
  }
  
  // matches <foo>...</foo> extracts content
  var matchtag = (function() {
  	var mtcache = {};
  	return function matchtag(f,g) {
  		var t = f+"|"+g;
  		if(mtcache[t] !== undefined) return mtcache[t];
  		return (mtcache[t] = new RegExp('<(?:\\w+:)?'+f+'(?: xml:space="preserve")?(?:[^>]*)>([^\u2603]*)</(?:\\w+:)?'+f+'>',(g||"")));
  	};
  })();
  
  var vtregex = (function(){ var vt_cache = {};
  	return function vt_regex(bt) {
  		if(vt_cache[bt] !== undefined) return vt_cache[bt];
  		return (vt_cache[bt] = new RegExp("<vt:" + bt + ">(.*?)</vt:" + bt + ">", 'g') );
  };})();
  var vtvregex = /<\/?vt:variant>/g, vtmregex = /<vt:([^>]*)>(.*)</;
  function parseVector(data) {
  	var h = parsexmltag(data);
  
  	var matches = data.match(vtregex(h.baseType))||[];
  	if(matches.length != h.size) throw "unexpected vector length " + matches.length + " != " + h.size;
  	var res = [];
  	matches.forEach(function(x) {
  		var v = x.replace(vtvregex,"").match(vtmregex);
  		res.push({v:v[2], t:v[1]});
  	});
  	return res;
  }
  
  var wtregex = /(^\s|\s$|\n)/;
  function writetag(f,g) {return '<' + f + (g.match(wtregex)?' xml:space="preserve"' : "") + '>' + g + '</' + f + '>';}
  
  function wxt_helper(h) { return keys(h).map(function(k) { return " " + k + '="' + h[k] + '"';}).join(""); }
  function writextag(f,g,h) { return '<' + f + (isval(h) ? wxt_helper(h) : "") + (isval(g) ? (g.match(wtregex)?' xml:space="preserve"' : "") + '>' + g + '</' + f : "/") + '>';}
  
  function write_w3cdtf(d, t) { try { return d.toISOString().replace(/\.\d*/,""); } catch(e) { if(t) throw e; } }
  
  function write_vt(s) {
  	switch(typeof s) {
  		case 'string': return writextag('vt:lpwstr', s);
  		case 'number': return writextag((s|0)==s?'vt:i4':'vt:r8', String(s));
  		case 'boolean': return writextag('vt:bool',s?'true':'false');
  	}
  	if(s instanceof Date) return writextag('vt:filetime', write_w3cdtf(s));
  	throw new Error("Unable to serialize " + s);
  }
  
  var XML_HEADER = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\r\n';
  var XMLNS = {
  	'dc': 'http://purl.org/dc/elements/1.1/',
  	'dcterms': 'http://purl.org/dc/terms/',
  	'dcmitype': 'http://purl.org/dc/dcmitype/',
  	'mx': 'http://schemas.microsoft.com/office/mac/excel/2008/main',
  	'r': 'http://schemas.openxmlformats.org/officeDocument/2006/relationships',
  	'sjs': 'http://schemas.openxmlformats.org/package/2006/sheetjs/core-properties',
  	'vt': 'http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes',
  	'xsi': 'http://www.w3.org/2001/XMLSchema-instance',
  	'xsd': 'http://www.w3.org/2001/XMLSchema'
  };
  
  XMLNS.main = [
  	'http://schemas.openxmlformats.org/spreadsheetml/2006/main',
  	'http://purl.oclc.org/ooxml/spreadsheetml/main',
  	'http://schemas.microsoft.com/office/excel/2006/main',
  	'http://schemas.microsoft.com/office/excel/2006/2'
  ];
  
  