The nested elements of this filter must be
specify a set of stations that are the
conjunction of the final results
This type can support N-dimensional bounds and
arbitrary coordinate reference systems (CRS).
The upperCorner and lowerCorner elements support
a space separated list of double values
representing the coordinates in the specified
CRS (specified via the srsName attribute). Using
a fake CRS of "lat [deg]/lon [deg]/elevation
[m]" one could specify a 3-dimensional cube with
length .9 degrees with 1.8 degrees, depth 500
meters (extending 100 meters below sea level)
as:
60.1 30.2 -100
61.0 32.0 400