Hi Nuno,
I believe you might have broken the GML striping rule there.
>From our documentation:
http://docs.geoserver.org/latest/en/user/data/app-schema/mapping-file.html
----
Note that the GML encoding rules require that complex types are never the
direct property of another complex type; they are always contained in a
property type to ensure that their type is encoded in a surrounding
element. Encoded GML is always type/property/type/property. This is also
known as the GML “striping” rule. The consequence of this for app-schema
mapping files is that targetAttributeNode must be applied to the property
and the type must be set to the XSD property type, not to the type of the
contained attribute (gsml:CGI_TermValuePropertyType not
gsml:CGI_TermValueType). Because the XPath refers to a property type not
the encoded content, targetAttributeNode appears in a mapping with
targetAttribute and no other elements when using with complex types.
----
A schema breaking the rule won't be properly encoded. If you search the
history of geoserver-users there are cases of official schemas breaking
such rules, and being impossible to encode in GeoServer.
I don't know if it's just a case of the implementation being "rigid" here,
or if there is an actual, fundamental reason not to support non striped
models here.
Cheers
Andrea
On Wed, Nov 2, 2016 at 11:09 AM, Nuno Oliveira <
nuno.olive...@geo-solutions.it> wrote:
> Hi,
>
> I have a doubt regarding the way GML complex features encoder handles a
> sub collection of features, i.e. chained features.
>
> The example use case is the representation of some meteorological stations
> measurements in GML. The complex feature
> represents a station were the measurements are represented as a sub
> collection of features. The XML expected representation
> would be something like this:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <wfs:FeatureCollection ...>
> <st:featureMember>
> <st:StationFeature gml:id="1">
> <st:name>station 1</st:name>
> <st:contact>
> <st:mail>stati...@mail.com</st:mail>
> </st:contact>
> <st:measurement>
> <st:name>temp</st:name>
> <st:unit>c</st:unit>
> <st:value>35.5</st:value>
> </st:measurement>
> <st:measurement>
> <st:name>wind</st:name>
> <st:unit>km/h</st:unit>
> <st:value>110.5</st:value>
> </st:measurement>
> <st:geometry>
> <gml:Point srsName="http://www.opengis.ne
> t/gml/srs/epsg.xml#4326">
> <gml:coordinates>50.0,60.0</gml:coordinates>
> </gml:Point>
> </st:geometry>
> </st:StationFeature>
> </gml:featureMember>
> </wfs:FeatureCollection>
>
> The first GML based schema I wrote for this didn't work, i.e. the
> measurements sub collection was not encoded by
> the encoder, please find that schema attached with name stations1.xsd.
> After some investigation I found that my
> problem was in this piece of code:
>
> https://github.com/geotools/geotools/blob/master/modules/ext
> ension/xsd/xsd-gml3/src/main/java/org/geotools/gml3/binding
> s/ComplexSupportXSAnyTypeBinding.java#L176-L177
>
> Basically no child elements were extracted, and in this case the child
> elements were the station measurements. After checking
> the app-schema examples I came up with this second schema that worked,
> please find that schema attached with name stations2.xsd.
>
> The main difference is that I wrapped the measurement element with the
> MeasurmentPropertyType:
>
> <xs:complexType name="MeasurementPropertyType">
> <xs:sequence minOccurs="0">
> <xs:element ref="st:Measurement"/>
> </xs:sequence>
> <xs:attributeGroup ref="gml:AssociationAttributeGroup"/>
> </xs:complexType>
>
> This stations use case is just an example, I have a much more complex use
> case with the same problem were I cannot change the schema.
> So I'm wondering, did anyone had a similar use case ? did I made something
> wrong in the app-schema mappings-file ? is this something is
> just not supported by the encoder ? and did my first schema actually makes
> sense (in my point of view it looks sane) ?
>
> Any help with this will be very very welcomed :)
>
> Regards,
>
> Nuno Oliveira
>
> --
> ==
> GeoServer Professional Services from the experts!
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> Nuno Miguel Carvalho Oliveira
> @nmcoliveira
> Software Engineer
>
> GeoSolutions S.A.S.
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Via di Montramito 3/A
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*AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*
Le informazioni contenute in questo messaggio di posta elettronica e/o
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loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.
The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.
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