[MapServer-dev] Possibly undocumented 8.0 change
Jeff McKenna
jmckenna at gatewaygeomatics.com
Mon Aug 29 06:35:45 PDT 2022
Thanks Rich, I'll add it into the MigrationGuide today, great catch.
-jeff
--
Jeff McKenna
GatewayGeo: Developers of MS4W, MapServer Consulting and Training
co-founder of FOSS4G
http://gatewaygeo.com/
On 2022-08-29 10:18 a.m., Richard Greenwood wrote:
> Rahkonen,
>
> Thank you for the explanation of the WMS definitions, but my point is
> that this is a breaking change from MapServer map files prior to 8.0.
> The change does not return an error message that helps the user identify
> the problem, so I thought that it might be helpful to note the change in
> the migration guide:
> https://mapserver.org/MIGRATION_GUIDE.html#migration-8-0
> <https://mapserver.org/MIGRATION_GUIDE.html#migration-8-0>
>
> On Mon, Aug 29, 2022 at 5:10 AM Rahkonen Jukka
> <jukka.rahkonen at maanmittauslaitos.fi
> <mailto:jukka.rahkonen at maanmittauslaitos.fi>> wrote:
>
> Hi,____
>
> __ __
>
> So no need for the “opaque container” that is actually kind of a
> hack in Geoserver. In WMS normal layers must have names, this is
> from WMS 1.3.0 standard:____
>
>
> 7.2.4.6.3 Name____
>
> If, and only if, a layer has a <Name>, then it is a map layer that
> can be requested by using that Name in the____
>
> LAYERS parameter of a GetMap request. A Layer that contains a <Name>
> element is referred to as a “named____
>
> layer” in this International Standard. If the layer has a Title but
> no Name, then that layer is only a category title for____
>
> all the layers nested within. A server that advertises a Layer
> containing a Name element shall be able to accept____
>
> that Name as the value of LAYERS argument in a GetMap request and
> return the corresponding map. A client____
>
> shall not attempt to request a layer that has a Title but no Name.____
>
> __ __
>
> There is something documented about the layer names in
> https://mapserver.gis.umn.edu/ogc/wms_server.html
> <https://mapserver.gis.umn.edu/ogc/wms_server.html> but not really
> that the rules apply also if layer belongs to a group:____
>
> __ __
>
> “Layer Name and wms_title metadata:____
>
> __ __
>
> Every individual layer needs its own unique name and title. Layer
> names are also used in GetMap and GetFeatureInfo requests to refer
> to layers that should be included in the map output and in the
> query. Layer names must start with a letter when setting up a WMS
> server (layer names should not start with a digit or have spaces in
> them).”____
>
> __ __
>
> -Jukka Rahkonen-____
>
> __ __
>
> __ __
>
> *Lähettäjä:* Richard Greenwood <richard.greenwood at gmail.com
> <mailto:richard.greenwood at gmail.com>>
> *Lähetetty:* maanantai 29. elokuuta 2022 13.40
> *Vastaanottaja:* Rahkonen Jukka <jukka.rahkonen at maanmittauslaitos.fi
> <mailto:jukka.rahkonen at maanmittauslaitos.fi>>
> *Kopio:* Seth G <sethg at geographika.co.uk
> <mailto:sethg at geographika.co.uk>>; MapServer Devs
> <mapserver-dev at lists.osgeo.org <mailto:mapserver-dev at lists.osgeo.org>>
> *Aihe:* Re: [MapServer-dev] Possibly undocumented 8.0 change____
>
> __ __
>
> No, just laziness. It's not a big deal, but maybe should be
> documented. ____
>
> __ __
>
> On Mon, Aug 29, 2022, 11:58 AM Rahkonen Jukka
> <jukka.rahkonen at maanmittauslaitos.fi
> <mailto:jukka.rahkonen at maanmittauslaitos.fi>> wrote:____
>
> Hi Richard,____
>
> ____
>
> Is your aim with using GROUP without NAME to hide the layer from
> GetCapabilities so that users cannot see or request that layer
> separately but only as a member of a group? Like “opaque
> container” in Geoserver
> https://docs.geoserver.org/latest/en/user/data/webadmin/layergroups.html <https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.geoserver.org%2Flatest%2Fen%2Fuser%2Fdata%2Fwebadmin%2Flayergroups.html&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C4e29f6da035b41ae58da08da89aace2d%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637973663938909073%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=fqqIU8Ul9FjwpjHXKlWjAMqT9OGaL7oLQFLdoKnjxto%3D&reserved=0>____
>
> ____
>
> -Jukka Rahkonen-____
>
> ____
>
> ____
>
> ____
>
> *Lähettäjä:* Seth G <sethg at geographika.co.uk
> <mailto:sethg at geographika.co.uk>>
> *Lähetetty:* maanantai 29. elokuuta 2022 10.45
> *Vastaanottaja:* Richard Greenwood <richard.greenwood at gmail.com
> <mailto:richard.greenwood at gmail.com>>; Rahkonen Jukka
> <jukka.rahkonen at maanmittauslaitos.fi
> <mailto:jukka.rahkonen at maanmittauslaitos.fi>>
> *Kopio:* MapServer Devs <mapserver-dev at lists.osgeo.org
> <mailto:mapserver-dev at lists.osgeo.org>>
> *Aihe:* Re: [MapServer-dev] Possibly undocumented 8.0 change____
>
> ____
>
> Hi Richard,____
>
> ____
>
> Could you create an issue for this on GitHub?____
>
> It looks like it could relate to the move to C++.____
>
> Thanks,____
>
> ____
>
> Seth____
>
> ____
>
> --____
>
> web:https://geographika.net
> <https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgeographika.net%2F&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C4e29f6da035b41ae58da08da89aace2d%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637973663938909073%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=DS8KRO6ZFREovCqteYci3oD%2B9sDxjv2TTCHbANGJJaI%3D&reserved=0>____
>
> twitter: @geographika____
>
> ____
>
> ____
>
> On Mon, Aug 29, 2022, at 9:34 AM, Richard Greenwood wrote:____
>
> An empty string for the NAME works without error. I set
> the MS_DEBUGLEVEL to 5 and nothing is written to the error
> file when this error occurs.____
>
> ____
>
> On Mon, Aug 29, 2022 at 12:44 AM Rahkonen Jukka
> <jukka.rahkonen at maanmittauslaitos.fi
> <mailto:jukka.rahkonen at maanmittauslaitos.fi>> wrote:____
>
> Hi,____
>
> ____
>
> What happens if you use an empty NAME?____
>
> ____
>
> -Jukka Rahkonen-____
>
> ____
>
> *Lähettäjä:* MapServer-dev
> <mapserver-dev-bounces at lists.osgeo.org
> <mailto:mapserver-dev-bounces at lists.osgeo.org>>
> *Puolesta *Richard Greenwood____
>
> *Lähetetty:* maanantai 29. elokuuta 2022 9.06____
>
> *Vastaanottaja:* Seth G <sethg at geographika.co.uk
> <mailto:sethg at geographika.co.uk>>____
>
> *Kopio:* MapServer Devs <mapserver-dev at lists.osgeo.org
> <mailto:mapserver-dev at lists.osgeo.org>>____
>
> *Aihe:* Re: [MapServer-dev] Possibly undocumented 8.0
> change____
>
> ____
>
> Yes, it's with a WMS request. Apache throws a 500 error
> "End of script output before headers". I define a LAYER
> with a GROUP but no NAME. I don't believe METADATA plays
> into it because I commented out the METADATA block and
> it fails in the same way.____
>
> ____
>
> On Sun, Aug 28, 2022 at 3:07 PM Seth G
> <sethg at geographika.co.uk
> <mailto:sethg at geographika.co.uk>> wrote:____
>
> Hi Richard,____
>
> ____
>
> Do you have more details - is this when using WMS?
> Is there an error that appears?____
>
> For WMS there is a known conflict between GROUP and
> wms_layer_group in a METADATA block, but this sounds
> like something different.____
>
> ____
>
> Seth____
>
> ____
>
> --____
>
> web:https://geographika.net
> <https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgeographika.net%2F&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C4e29f6da035b41ae58da08da89aace2d%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637973663938909073%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=DS8KRO6ZFREovCqteYci3oD%2B9sDxjv2TTCHbANGJJaI%3D&reserved=0>____
>
> twitter: @geographika____
>
> ____
>
> ____
>
> On Sun, Aug 28, 2022, at 3:53 PM, Richard Greenwood
> wrote:____
>
> I didn't see mention of this in the docs,
> apologies if I missed it. It appears that as of
> 8.0 a layer must have a NAME. In the past it has
> been possible for a layer not to have a NAME if
> it had a GROUP.____
>
> ____
>
> -- ____
>
> Richard W. Greenwood____
>
> www.greenwoodmap.com
> <https://eur06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.greenwoodmap.com%2F&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C4e29f6da035b41ae58da08da89aace2d%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637973663938909073%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=42axJiUotL4lrds1YbVXt8cc7Ed0IC%2B2IlySiRF5R3Q%3D&reserved=0>____
>
> ___________________________________________________
>
> MapServer-dev mailing list____
>
> MapServer-dev at lists.osgeo.org
> <mailto:MapServer-dev at lists.osgeo.org>____
>
> https://lists.osgeo.org/mailman/listinfo/mapserver-dev <https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.osgeo.org%2Fmailman%2Flistinfo%2Fmapserver-dev&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C4e29f6da035b41ae58da08da89aace2d%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637973663938909073%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=RGeZuORawrRt55QWp1f9B1n3o6rjqogikR2zw4lHyF0%3D&reserved=0>____
>
> ____
>
> ____
>
> ____
>
> ____
>
> -- ____
>
> Richard W. Greenwood____
>
> www.greenwoodmap.com
> <https://eur06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.greenwoodmap.com%2F&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C4e29f6da035b41ae58da08da89aace2d%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637973663938909073%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=42axJiUotL4lrds1YbVXt8cc7Ed0IC%2B2IlySiRF5R3Q%3D&reserved=0>____
>
> ____
>
> ____
>
> -- ____
>
> Richard W. Greenwood____
>
> www.greenwoodmap.com
> <https://eur06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.greenwoodmap.com%2F&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C4e29f6da035b41ae58da08da89aace2d%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C637973663938909073%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=42axJiUotL4lrds1YbVXt8cc7Ed0IC%2B2IlySiRF5R3Q%3D&reserved=0>____
>
> ____
>
>
>
> --
> Richard W. Greenwood
> www.greenwoodmap.com <http://www.greenwoodmap.com>
>
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