function exists(vObject) {
		if (arguments.length === 1) {
			return Array.isArray(vObject) ? vObject.length > 0 : !!vObject;
		}

		return Array.prototype.slice.call(arguments).every(function (oObject) {
			return exists(oObject);
		});
	}
Returns HTML tag of the page footer.

@param {sap.uxap.ObjectPageAccessibleLandmarkInfo} oLandmarkInfo ObjectPageLayout LandmarkInfo
@returns {string} The HTML tag of the page footer.
@private