Hi,
The other day I stepped in to this too and I discovered that we can access
chained features by using '.' instead of '/'.
This is directly supported by the CQL grammar that will convert the CQL
expression to a XPATH expression.
Using the GSML app-schema tutorial, this CQL filter on complex features will
work:
gsml:MappedFeature.gml:name = 'Some basalt' AND
gsml:MappedFeature.gsml:observationMethod.gsml:CGI_TermValue.gsml:value =
'urn:ogc:def:nil:OGC:missing'
Cheers,
Nuno Oliveira
On 08/14/2017 11:13 PM, Ben Caradoc-Davies wrote:
Gavin,
filter complex features by referencing xpath properties in the output. The
client never needs to know about the source tables. app-schema converts the
client filter into filters against the source tables, or efficient SQL join
queries if joining is used.
The cql_filter vendor parameter works fine for top-level properties like gml:name but I can find no
way of encoding xpaths because "/" and "@" are invalid and not recognised as
part of the property selector. In these cases you should be able to use filter (OGC Filter XML)
rather than cql_filter.
Kind regards,
Ben.
On 15/08/17 07:42, Gavin Medley wrote:
Hi all,
How would one use a CQL_Filter parameter in a WFS request to filter the
results given by an app schema mapped complex feature using feature
chaining. The way I understand it, CQL_Filter operates using a WHERE
statement in a CQL query but how does that work when each (linked) mapping
file may be accessing a different table? Does the filter get applied to the
top level mapping file? I haven't been able to make it work at all. Perhaps
I'm totally misunderstanding it though.
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