I have tested against some downstream apps, and
Using a table with a point and an XML element, I have done some downstream
testing. I have made some improvements to better support them (notably GML2
support for XML), and will be updating my PR with these changes shortly.
Overall, downstream applications have very poor support for the XML type
(important comments/observations in red):
GeoServer WFS: Gives xml output for both GML2 and GML3:
GML2:
<?xml version="1.0" encoding="UTF-8"?>
<wfs:FeatureCollection xmlns="http://www.opengis.net/wfs"; xmlns:wfs="
http://www.opengis.net/wfs"; xmlns:it.geosolutions="
http://www.geo-solutions.it"; xmlns:gml="http://www.opengis.net/gml";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="
http://www.opengis.net/wfs
http://localhost:8080/geoserver/schemas/wfs/1.0.0/WFS-basic.xsd
http://www.geo-solutions.it
http://localhost:8080/geoserver/it.geosolutions/wfs?service=WFS&version=1.0.0&request=DescribeFeatureType&typeName=it.geosolutions%3Aa_geoxml
">
<gml:boundedBy>
<gml:null>unknown</gml:null>
</gml:boundedBy>
<gml:featureMember>
<it.geosolutions:a_geoxml fid="a_geoxml.1">
<it.geosolutions:geom>
<gml:Point srsName="http://www.opengis.net/gml/srs/epsg.xml#4326";>
<gml:coordinates xmlns:gml="http://www.opengis.net/gml"; decimal="."
cs="," ts=" ">0,0</gml:coordinates>
</gml:Point>
</it.geosolutions:geom>
<it.geosolutions:xml>
<root>
docroot
<foo>bar</foo>
<bar>foo</bar>
</root>
</it.geosolutions:xml>
</it.geosolutions:a_geoxml>
</gml:featureMember>
<gml:featureMember>
<it.geosolutions:a_geoxml fid="a_geoxml.2">
<it.geosolutions:geom>
<gml:Point srsName="http://www.opengis.net/gml/srs/epsg.xml#4326";>
<gml:coordinates xmlns:gml="http://www.opengis.net/gml"; decimal="."
cs="," ts=" ">1,1</gml:coordinates>
</gml:Point>
</it.geosolutions:geom>
<it.geosolutions:xml>
<root>
docroot
<bar>foo</bar>
<foo>bar</foo>
</root>
</it.geosolutions:xml>
</it.geosolutions:a_geoxml>
</gml:featureMember></wfs:FeatureCollection>
GML3:
<?xml version="1.0" encoding="UTF-8"?>
<wfs:FeatureCollection xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:it.geosolutions="http://www.geo-solutions.it"; xmlns:ogc="
http://www.opengis.net/ogc"; xmlns:wfs="http://www.opengis.net/wfs";
xmlns:ows="http://www.opengis.net/ows"; xmlns:xlink="
http://www.w3.org/1999/xlink"; xmlns:gml="http://www.opengis.net/gml";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; numberOfFeatures="0"
timeStamp="2015-03-03T23:42:33.255Z" xsi:schemaLocation="
http://www.opengis.net/wfs
http://localhost:8080/geoserver/schemas/wfs/1.1.0/wfs.xsd
http://www.geo-solutions.it
http://localhost:8080/geoserver/it.geosolutions/wfs?service=WFS&version=1.0.0&request=DescribeFeatureType&typeName=it.geosolutions%3Aa_geoxml
">
<gml:featureMembers>
<it.geosolutions:a_geoxml gml:id="a_geoxml.1">
<it.geosolutions:geom/>
<it.geosolutions:xml>
<it.geosolutions:root>
docroot
<it.geosolutions:foo>bar</it.geosolutions:foo>
<it.geosolutions:bar>foo</it.geosolutions:bar>
</it.geosolutions:root>
</it.geosolutions:xml>
</it.geosolutions:a_geoxml>
<it.geosolutions:a_geoxml gml:id="a_geoxml.2">
<it.geosolutions:geom/>
<it.geosolutions:xml>
<it.geosolutions:root>
docroot
<it.geosolutions:bar>foo</it.geosolutions:bar>
<it.geosolutions:foo>bar</it.geosolutions:foo>
</it.geosolutions:root>
</it.geosolutions:xml>
</it.geosolutions:a_geoxml>
</gml:featureMembers>
</wfs:FeatureCollection>
Note that for GML 3 the elements inherit the namespaces of the parent XML.
I am not sure if this is desired?
Also note that the XML element looks like:
<root>
docroot
<foo>bar</foo>
<bar>foo</bar>
</root>
For all other WFS formats (GeoJSON, CSV, ...), the XML is interpreted as a
string: "[#document-fragment: null]"
For WMS getFeatureInfo, the XML attribute is also interpreted as a string:
"[#document-fragment: null]"
QGIS: The XML root element is not recognized. The child nodes "foo" and
"bar" register as seperate attributes:
[image: Inline image 1]
Gaia: The root element registers as a child of the XML attribute. The bar
element registers as its own attribute. The foo element does not appear:
[image: Inline image 3]
UDig: The XML type is not parsed, leading to a blank element:
[image: Inline image 2]
Overall, downstream applications have very poor compatability with XML.
I also notice that getFeatureInfo, as well as GeoJSON, CSV, etc. all seem
to do a toString on the WC3 Document that is storing the XML? I guess I
will need to modify the encoders for all of these as well. I am somewhat
surprised that they are not using something like Converters?
Torben
On Tue, Feb 24, 2015 at 10:47 AM, Andrea Aime <andrea.a...@geo-solutions.it>
wrote:
> On Tue, Feb 24, 2015 at 4:31 PM, Torben Barsballe <
> tbarsba...@boundlessgeo.com> wrote:
>
>> With respect to client testing, are all of these projects downstream of
>> GeoTools? I know Udig is, but QGIS looks like it only depends on the C++
>> port of JTS? Then to properly test these changes, I would need to build
>> each of these projects locally correct?
>>
>
> Hum no, I really meant, serving these extended GML from GeoServer WFS, and
> connect the clients to it, see how that works.
> So no building, just installing binaries and checking if all works fine,
> and if not, if there is some reasonable approach to make it better.
>
>
>>
>> I hadn't heard of Gaia before, is this the right project:
>> http://gcmd.nasa.gov/records/CARBONTOOLS_GAIA.html
>>
>
> I normally use this one:
> http://thecarbonproject.azurewebsites.net/Products/Gaia
>
>>
>>
>> For the oracle API, implementation is further complicated by the fact
>> that all the XML functions use a seperate set of JARs from the Oracle
>> XML Developers Kit. (This is actually where I am running into most of the
>> trouble).
>>
>
> I see... yeah, Oracle takes pleasure in inflicting pain to open source
> developers it seems...
>
> Cheers
> Andrea
>
> --
> ==
> GeoServer Professional Services from the experts! Visit
> http://goo.gl/NWWaa2 for more information.
> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
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>
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