Defines basic ResponseType definition and commonly used sensor characteristics Remember - attributes are Optional by default --> Max three characters to use as token or block separator One character to use as a decimal separator Allows specification of the stream/packaging format used (ex: RTP, ASF, AAF, TML...) Carries the designator for an element implementing an XML-encoded data-type Carries the designator for an element implementing an XML-encoded data-type May be any XML Schema defined global element. typically this will be swe:Array, swe:Record, cv:CV_DiscreteCoverage, etc