src/js/pannellum.js
function(tag) {
                var result;
                if (xmpData.indexOf(tag + '="') >= 0) {
                    result = xmpData.substring(xmpData.indexOf(tag + '="') + tag.length + 2);
                    result = result.substring(0, result.indexOf('"'));
                } else if (xmpData.indexOf(tag + '>') >= 0) {
                    result = xmpData.substring(xmpData.indexOf(tag + '>') + tag.length + 1);
                    result = result.substring(0, result.indexOf('<'));
                }
                if (result !== undefined) {
                    return Number(result);
                }
                return null;
            }
function(tag) {
                var result;
                if (xmpData.indexOf(tag + '="') >= 0) {
                    result = xmpData.substring(xmpData.indexOf(tag + '="') + tag.length + 2);
                    result = result.substring(0, result.indexOf('"'));
                } else if (xmpData.indexOf(tag + '>') >= 0) {
                    result = xmpData.substring(xmpData.indexOf(tag + '>') + tag.length + 1);
                    result = result.substring(0, result.indexOf('<'));
                }
                if (result !== undefined) {
                    return Number(result);
                }
                return null;
            }
Extract the requested tag from the XMP data