[Name] maxage [Required] false [Attribute Constraints] This attribute may not be specified in conjunction with the prepareddialogid attribute. [Type] ECMAScript Expression [Default Value] none [Description] The character string returned is interpreted as a time interval. This indicates that the document is willing to use content whose age is no greater than the specified time in seconds (cf. 'max-age' in HTTP 1.1 [RFC2616]). The document is not willing to use stale content, unless maxstale is also provided. [Valid Values] 
An ECMAScript expression which returns a valid time value for the HTTP 1.1 request [RFC2616]