Hi Ben,
Thank you for the feedback :)
In the first step nested properties generated by feature chaining will be ignored, the default
geometry will need to be a mapped property of the feature type.
Then, this may be extended to support the use case of having a chained feature
with cardinality 0 or 1.
Thank you for the heads up regarding the AppSchemaDataAcess schema, I will
update it.
Regards,
Nuno Oliveira
On 02/19/2018 10:42 PM, Ben Caradoc-Davies wrote:
Nuno,
that sounds like a useful improvement. One consideration is what happens when a nested geometry is
multivalued and has a cardinality of zero or more than one. Also, do you anticipate that your
implementation will work with nested properties generated by feature chaining? I am thinking of
joining and filtering with spatial predicates.
Please also update
<modules/extension/app-schema/app-schema/src/test/resources/test-data/AppSchemaDataAccess.xsd> to
include this new element. I think this is still the canonical source for the schema, although we
do not yet have a good way of distributing it.
Kind regards,
Ben.
On 19/02/18 22:29, Nuno Oliveira wrote:
Hi all,
Currently is not possible to specify in App-Schema mappings the default geometry of a mapped
feature type,
note that having a default geometry defined is mainly important for WMS.
Most of the times a geometry will be available in the root feature type and a default geometry
will be correctly
and automatically selected.
But in certain situations a feature type may have multiple geometries, or the geometry may be
nested,
for example:
<wfs:member>
<st:Station gml:id = "station.st.1">
<st:name>station1</st:name>
<st:location>
<st:name>Europe</st:name>
*<st:position>*
* <gml:Point srsDimension="2"*
* srsName="http://www.opengis.net/gml/srs/epsg.xml#4326" >*
* <gml:pos>-1.0 1.0</gml:pos>*
* </gml:Point>*
* </st:position>*
</st:location>
</st:Station>
</wfs:member>
In this case the geometry is nested inside the location element. I propose to
extend App-Schema
mappings to allows us to define explicitly the default geometry:
<FeatureTypeMapping>
<sourceDataStore>stations</sourceDataStore>
<sourceType>stations</sourceType>
<targetElement>st:Station</targetElement>
*<defaultGeometry>st:location/st:position</defaultGeometry>*
<attributeMappings>
<AttributeMapping>
<targetAttribute>st:Station</targetAttribute>
<idExpression>
<OCQL>strConcat('station.', ID)</OCQL>
</idExpression>
</AttributeMapping>
Any objection or comments ?
Cheers,
Nuno Oliveira
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