Hi Ian,
Yes, ISO 19115 states following about GetCapabilities and resulting WMS
layer style clause:
Style
Required to have name/title elements, if only one style it is default
Optional
But it's not about resulting style info (as it's Optional anyways), it's
rather how Geoserver handles default and/or non-existing layer requests
under the hood.
Regards,
Maksim Sestic
_____
From: Ian Turton [mailto:ijtur...@gmail.com]
Sent: Friday, June 21, 2013 15:02
To: Maksim Sestic
Cc: Jonathan Moules; geoserver-users
Subject: Re: [Geoserver-users] LayerGroup default style
You can't ask for styles that are not listed in the capabilities document
against that layer.
Ian
On 21 June 2013 13:47, Maksim Sestic <m...@geoinova.com> wrote:
Hi Jonathan,
To the end-user of the WMS, a LayerGroup is actually single layer, so in
theory they should be able to specify a style when requesting it. However,
I've just tested it and the style is completely ignored.
Strictly speaking this seems contrary to what the WMS spec says should
happen.
My thoughts exactly.
Regards,
Maksim Sestic
_____
From: Jonathan Moules [mailto:jonathanmou...@warwickshire.gov.uk]
Sent: Friday, June 21, 2013 13:59
To: Maksim Sestic
Cc: geoserver-users@lists.sourceforge.net
Subject: Re: [Geoserver-users] LayerGroup default style
Hi Maksim
With regards to LayerGroup style - I guess it should have one in case
Geoserver publishes it as a Single layer (?)... although a "shallow" one
since setting SLD at root level should override containing layer styles.
That is something that I was scratching my head about reading the spec. It
clearly says:
"Comma-separated list of one rendering style per requested layer."
To the end-user of the WMS, a LayerGroup is actually single layer, so in
theory they should be able to specify a style when requesting it. However,
I've just tested it and the style is completely ignored.
Strictly speaking this seems contrary to what the WMS spec says should
happen.
But for bonus fun, as you've discovered, if the style you specify doesn't
exist, GeoServer will give you an exception. So LayerGroups seem to be the
worst of both worlds:
- Include a non-existent style and it will error.
- Include a valid style and it will be ignored.
To me the solution is actually for LayerGroups to completely ignore the
style parameter, even if the given value is invalid. They're already
breaking the spec, why not go one step further. :-)
Of course, the solution for you is to fill in anything you want as the
style, just make sure it exists. "line" "point" etc as the undeleatable
GeoServer defaults would be good choices to use.
Regards,
Jonathan
On 21 June 2013 11:21, Maksim Sestic <m...@geoinova.com> wrote:
Hi Jonathan,
Yes, I agree, MapGuide is missing a point with "styles=default". Alas, this
happens on both open source and commercial MG platforms I'm dealing with.
This actually has to do with FDO provider for WMS (http://fdo.osgeo.org/)
under the hood. I'm currently trying to figure out whether it's possible to
override such beahviour using additional WMS parameters, but it's less
likely.
With regards to LayerGroup style - I guess it should have one in case
Geoserver publishes it as a Single layer (?)... although a "shallow" one
since setting SLD at root level should override containing layer styles.
Regards,
Maksim Sestic
_____
From: Jonathan Moules [mailto:jonathanmou...@warwickshire.gov.uk]
Sent: Friday, June 21, 2013 11:39
To: Maksim Sestic
Cc: geoserver-users@lists.sourceforge.net
Subject: Re: [Geoserver-users] LayerGroup default style
Hi Maksim,
Several thoughts:
1) MapGuide Server's behaviour seems odd. The WMS spec is very clear: if you
ask for a style that doesn't exist then an exception *shall* be raised. So
filling in "default" seems odd as there is no guarantee that a "default"
will exist. Blank is the logical choice - the spec is clear:
"A client *may* request the default Style using a null value (as in
"STYLES=")."
So even though it's a "may" not a "shall", MapGuide Server seems to be doing
it wrong.
2) Can't you use the "SLD" parameter to point to a "default" SLD of your own
choosing?
3) I don't think a LayerGroup can have a single style, although for
scenarios like this I imagine it should be possible to, but then, how do you
create a single SLD that encompasses all of the different components?
Regards,
Jonathan
On 17 June 2013 16:25, Maksim Sestic <m...@geoinova.com> wrote:
Is it possible to name LayerGroup's "global" style somehow? There are
applications (e.g. MapGuide Server) that require style name, and if not
explicitly specified they query for "default" (thus "style=default" in URL
params). Once GeoServer receives a query for LayerGroup's style named
"default" it throws "ERROR [geoserver.ows] -
org.geoserver.platform.ServiceException: No such style: default" exception.
With kindest regards,
Maksim Sestic
--
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