[MapServer-dev] Possibly undocumented 8.0 change

Mon Aug 29 06:18:21 PDT 2022

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

On Mon, Aug 29, 2022 at 5:10 AM Rahkonen Jukka <
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 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>
> *Lähetetty:* maanantai 29. elokuuta 2022 13.40
> *Vastaanottaja:* Rahkonen Jukka <jukka.rahkonen at maanmittauslaitos.fi>
> *Kopio:* Seth G <sethg at geographika.co.uk>; MapServer Devs <
> 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> 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>
> *Lähetetty:* maanantai 29. elokuuta 2022 10.45
> *Vastaanottaja:* Richard Greenwood <richard.greenwood at gmail.com>;
> Rahkonen Jukka <jukka.rahkonen at maanmittauslaitos.fi>
> *Kopio:* MapServer Devs <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> wrote:
>
> Hi,
>
>
>
> What happens if you use an empty NAME?
>
>
>
> -Jukka Rahkonen-
>
>
>
> *Lähettäjä:* MapServer-dev <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>
>
> *Kopio:* MapServer Devs <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> 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>
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>
>
>
> --
>
> 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>
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>
>
>
>
> --
>
> 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>
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-- 
Richard W. Greenwood
www.greenwoodmap.com
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