Hi,
the fancy app-schema I'm dealing with these days has the following twist:
<gml:Polygon>
<gml:metaDataProperty>
<gml:GenericMetaData>
<extention>
<area uom="m2">8476875.000000</area>
<length uom="m">108.706000</length>
<width uom="m">13.863100</width>
</extention>
</gml:GenericMetaData>
</gml:metaDataProperty>
<gml:exterior>
<gml:LinearRing>
<gml:posList>
31.214218 43.833347 31.215328 43.833862 31.216240 43.833717 ...
</gml:posList>
</gml:LinearRing>
</gml:exterior>
</gml:Polygon>
See the metadata property? Well, GenericMetadata can contain xs:any.
And it's part
of the GML standard, not something made up for the occasion.
I wondering how one can make the above parseable, WFS queriable, and of course
generate it as GML3 output too. And coming out empty handed if I only
consider what GeoTools
can offer me.
One potential place to store those metadatas could be the geometry
user map... but it's
normally already busy with the CRS.
Even assuming it was free, the encoder would normally just ignore it...
And there would also be the issue of representing that nesting with
the complex data store
starting from the usual flat table. Does not seem to be doable either,
I mean, I see no
way to attach metadata read from a flat feature type into the geometries.
I guess I'll have to skip the geotools parser, write my own
(thankfully the structure
is always going to be the same so it's not too hard), store those metadata as a
property with multiplicity > 1, and when it's time to output, xlst it
into the right shape...
(and forget about making those metadata queriable)
Any better suggestion? :)
Cheers
Andrea
-----------------------------------------------------
Ing. Andrea Aime
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584962313
fax: +39 0584962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.linkedin.com/in/andreaaime
http://twitter.com/geowolf
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