gml:boundedBy issue with BBOX definition

[ninsbl]

When we (me and @pesekon2) tried using the sos4R client (https://cran.r-project.org/web/packages/sos4R/index.html) to fetch data from istSOS we ran into issues with spatial data of the response.
In particular, bounding box of the offerings was returned as NULL.

When looking at the response here:
http://istsos.org/istsos/demo?request=getCapabilities&section=contents&service=SOS
it seems that the bounding box is given differently from GML definition of envelope (www.datypic.com/sc/niem21/e-gml32_boundedBy.html). In fact, the response does not seem to be correct as only one coordinate pair is given (not both upper and lower corner). A second point and maybe the proper XML tags seem to be missing...

In comparison, http://sensorweb.demo.52north.org/52n-sos-webapp/service?service=SOS&request=GetCapabilities gives the BBOX exactly as in the GML definition... Maybe a bug?

[ninsbl]

Now I tested also with OWSlib, and OWSlib also returns neither BoundingBox nor CRS...

[ninsbl]

Seems to affect also the QGIS SOS client, which does not use OWSlib I think...

[ninsbl]

Seems to affect only SOS 1.0.0

istsos2/istsoslib/renderers/GCresponseRender.py

Line 137 in d3f90ac

r += " " + str(ofl.boundedBy) + "\n"

as the bpoundedBy definition for SOS 2.0 appears to be correct

istsos2/istsoslib/renderers/GCresponseRender.py

Line 408 in d3f90ac

r += " <gml:Envelope srsName=\"http://www.opengis.net/def/crs/EPSG/0/%s\">\n" % sosConfig.istsosepsg

@pesekon2 do you think you could work on this and create a PR?

[ninsbl]

The bug can also be here:

istsos2/istsoslib/responders/GCresponse.py

Line 276 in 31ae03f

def BuildOffEnvelope(pgdb,id,sosConfig):

[ninsbl]

Actually, in:

istsos2/istsoslib/responders/GCresponse.py

Line 286 in 31ae03f

sql = "SELECT ST_asgml(Box2D(u.geom)) as ext FROM"

a full GML 3 Envelope could be build like this:
SELECT ST_AsGML(3, ST_Collect(u.geom), 15, 32) as ext

[pesekon2]

The problem is that ofl in GCresponseRender has just a method boundedBy and boundedBy nor ofl doesn't contain anything like lowerX.

For me, the best way seems to involve here also this part from version 2.0.0 somehow. But before I start something like this, I would like to know from istSOS developers whether is it acceptable way and whether it can't destroy something.

PS: Is there any way to activate the debug level when quering through html request?