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List:       mapserver-dev
Subject:    Re: [mapserver-dev] Allowing spaces in layer names (WMS/WFS)
From:       "Rahkonen Jukka (MML)" <jukka.rahkonen () maanmittauslaitos ! fi>
Date:       2015-07-03 9:24:47
Message-ID: b4341ceef2bf40d3b234d9c412d867cf () C119S212VM022 ! msvyvi ! vaha ! local
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Hi,

The layer/featuretype/coverage name question pops up every now and then.

Summary:

- WMS and WCS 1.0 and 1.1 does not pose any limits to layer names which are strings
- WFS sets name to QName and does not allow spaces and adds some other rules as well
- WCS 2.0 defines layer name to be NCName which denies also colon

Nice to know detail is that the OGC schema of WFS 1.1.0 was accidentally written so \
that underscores are not allowed either. Schema validating software like Geoserver \
with POST requests are following the schema literally and do not accept underscores.

Here are some references from Geoserver mailing list:

http://sourceforge.net/p/geoserver/mailman/message/32808960/
http://sourceforge.net/p/geoserver/mailman/message/34029198/
http://osgeo-org.1560.x6.nabble.com/WFS-GetFeature-Post-Request-td5171303.html

You should read all references and probably some others as well because gathering the \
current understanding about valid names in OGC services has been an iterative process \
and individual mails can give partly wrong information. I wonder why OGC does not \
have an comprehensive document about the issue but because such does not exist it \
would be wonderful to have an OSGeo wiki and some best practices documents which \
would make Mapserver, Geoserver, deegree, QGIS server, rasdaman and other possible \
OGC implementations to behave similarly.

-Jukka Rahkonen-





-----Alkuperäinen viesti-----
Lähettäjä: mapserver-dev-bounces@lists.osgeo.org \
[mailto:mapserver-dev-bounces@lists.osgeo.org] Puolesta Even Rouault Lähetetty: 3. \
                heinäkuuta 2015 0:42
Vastaanottaja: Tamas Szekeres
Kopio: mapserver-dev@lists.osgeo.org
Aihe: Re: [mapserver-dev] Allowing spaces in layer names (WMS/WFS)

Le jeudi 02 juillet 2015 23:24:55, Tamas Szekeres a écrit :
> Hi All,
> 
> Thank you all for the comments. I would expect an option to provide an 
> (XML
> friendly) alias for the layer name which would be added to the 
> GetFeature response as the XML tag instead of the "real" layer name. Is that \
> possible? The "title" metadata tag doesn't seem to do what we would like to \
> achieve.

I'm not clear when you could use the "real" layer name with spaces, etc...?  I guess \
it would be invalid in both KVP and XML requests.

> 
> Thanks,
> 
> Tamas
> 
> 2015-07-02 15:55 GMT+02:00 Even Rouault <even.rouault@spatialys.com>:
> > Le jeudi 02 juillet 2015 14:16:10, Tamas Szekeres a écrit :
> > > Hi,
> > > 
> > > Could anyone explain the reason of limiting the layer names to 
> > > valid XML tag names (not containing spaces or any special 
> > > characters in that)? As
> > 
> > far
> > 
> > > as I know the layer names don't appear a XML tags in the OWS 
> > > requests
> > 
> > and I
> > 
> > > couldn't find such limitation in the WFS specs either.
> > > Many clients uses spaces in layer names and this is causing issues 
> > > for
> > 
> > us.
> > 
> > Tamas,
> > 
> > This is in fact a constraint of the WFS spec.
> > 
> > According to http://schemas.opengis.net/wfs/1.1.0/wfs.xsd,
> > 
> > <xsd:element name="Name" type="xsd:QName">
> > 
> > <xsd:annotation><xsd:documentation>
> > 
> > Name of this feature type, including any namespace
> > prefix
> > 
> > </xsd:documentation></xsd:annotation>
> > 
> > </xsd:element>
> > 
> > And xsd:QName, that builds upon xsd:NCName, doesn't allow spaces and 
> > many other characters.
> > 
> > Even
> > 
> > 
> > --
> > Spatialys - Geospatial professional services 
> > http://www.spatialys.com

--
Spatialys - Geospatial professional services http://www.spatialys.com \
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