I've been looking into this this week for my own work.
I note in the OGC Filters specification 2.0
(http://docs.opengeospatial.org/is/09-026r2/09-026r2.html) the following
definition for the PropertyIsNull operator:
"The PropertyIsNull operator tests the specified property to see if it exists
in the resource being evaluated. This corresponds to checking whether the
property exists in the real-world"
This is in contrast to the OGC Filters 1.0 spec which for the same filter says:
"The <PropertyIsNull> element encodes an operator that checks to see if
the value of its content is NULL. A NULL is equivalent to no value present. The
value 0 is a valid value and is not considered NULL."
So I guess if GeoServer switches to Filters 2.0, you'll be able to use the
PropertyIsNull operator in conjuncton with AND/OR/NOT to build an expression. I
just tried to do this with a 2.7.x install of Geoserver, but get the obligatory
XML error returned: "The requested Style can not be used with this layer"
(the 2.0 spec also includes a section demonstrating how to create a
"PropertyExists" filter; so someone clearly wanted this sort of functionality
added to the spec).
Cheers,
Jonathan
---- On Thu, 25 Feb 2016 07:18:27 +0000 Andrea Aime
<[email protected]> wrote ----
On Thu, Feb 25, 2016 at 2:17 AM, Martin Davis <[email protected]> wrote:
Just a guess, but this is probably caused by a pre-scan that GeoServer does to
validate that all the attributes referred to in the SLD are available in the
underlying layer. (One reason for this I think is that GeoServer only requests
the attributes needed to compute the SLD filters).
We actually do that because back at the time, we had a lot of complaints by
users that styles were not working
and upon inspection, they contained typos in the attribute names. That wasted a
lot of time on the list.
I'm not sure this can be called a bug, it's more of a design limitation. And
as such you may have to adjust your requirements to match the tool you are
using...
It's a design decision. If someone wants to do the work, I would not be opposed
to make the attribute check controlled
by a flag (system variable of sorts), so that it can be disabled
Cheers
Andrea
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