Hi,
I've just written a KML WFS output format leveraging the same machinery
used by the WMS output format, the output format generates the geometries
and the attributes using the extended data construct, and embeds in the KML
document also a schema, e.g.:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2"; xmlns:ns2="
http://www.google.com/kml/ext/2.2"; xmlns:ns3="http://www.w3.org/2005/Atom";
xmlns:ns4="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0">
<Document>
<Schema id="AggregateGeoFeature_1" name="AggregateGeoFeature_1">
<SimpleField name="description" type="string"/>
<SimpleField name="name" type="string"/>
<SimpleField name="doubleProperty" type="double"/>
<SimpleField name="intRangeProperty" type="int"/>
<SimpleField name="strProperty" type="string"/>
<SimpleField name="featureCode" type="string"/>
</Schema>
<Folder>
<name>AggregateGeoFeature</name>
<Placemark id="AggregateGeoFeature.f005">
<ExtendedData>
<SchemaData schemaUrl="#AggregateGeoFeature_1">
<SimpleData
name="description">description-f005</SimpleData>
<SimpleData name="name">name-f005</SimpleData>
<SimpleData
name="doubleProperty">2012.78</SimpleData>
<SimpleData name="strProperty">Ma quande lingues
coalesce, li grammatica del resultant lingue es plu simplic e regulari quam
ti del coalescent lingues. Li nov lingua franca va esser plu simplic e
regulari quam li existent Europan lingues.</SimpleData>
<SimpleData name="featureCode">BK030</SimpleData>
</SchemaData>
</ExtendedData>
<MultiGeometry>
<Point>
<coordinates>70.83,29.86</coordinates>
</Point>
<Point>
<coordinates>68.87,31.08</coordinates>
</Point>
<Point>
<coordinates>71.96,32.19</coordinates>
</Point>
</MultiGeometry>
</Placemark>
</Folder>
</Document>
</kml>
The output format automatically skips the extra geometry attributes (which
we cannot encode) and forces the output in wgs84 lon/lat as that's how KML
is defined.
While not as fast as GML2, it's still quite a bit faster than GML3 (tops at
around 20MB/s on my machine, while GML2 goes up to 25MB/s and GML3...
err... 2MB/s only...)
Cheers
Andrea
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Ing. Andrea Aime
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