SOS is an OGC Standard.
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request to retrieve certain features of interest of observations
om:OM_Process
pointer to a procedure which is observing the feature of interest
pointer to a property that was observed regarding the feature of interest
gml:AbstractFeature
pointer to a specific feature of interest (used to restrict the set of all possibly returned features of interest to a specific set)
specifies a filter which applies to a spatial property of the requested features. This property is defined in the valueReference element of the SpatialOperator.
response with features matching the request criteria
feature of interest matching the request parameters specified by the client