SWEobservation.xsd A GML conformant schema for rich Observations and Measurements SJDC 2003-01-30 base gml:Observation restricts using - must contain or point to a Procedure or Sensor add observable - identifes the phenomenon being sampled quality - some basic quality indications on the result relatedFeature - is a pointer to any other arbitrary feature restrict member types use the location property on a collection if all the members have the same location add timeStamp, target and relatedFeature use the timeStamp property on a collection if all the member observations have the same timeStamp use single target property on a collection if all the member observations have the same target As observationCollection, except has homogeneous member observations Thus the array may carry the observable and using . use the using property on an array if all the member observations use the same procedure use the observable property on an array to indicate the phenomenon of interest Concrete feature type. Concrete feature type. This element contains or points to a description of a sensor, instrument or procedure used for the observation