~Daniel Friesen (Dantman, Nadir-Seen-Fire) [http://danielfriesen.name/]

On 2013-09-19 4:44 PM, Chad wrote:
> On Thu, Sep 19, 2013 at 11:45 AM, Erik Bernhardson <
> [email protected]> wrote:
>
>>    3. Replace RC_EXTERNAL with RC_WIKIDATA and RC_FLOW constants in their
>>    respective extensions.  This is also straightforward,  but adds
>> development
>>    overhead to ensure future creators of RC_* constants do not conflict
>> with
>>    each other.  It would be handled similarly to NS_* constants with an
>>    on-wiki list.  I have heard some mention that naming conflicts have
>>    occurred in the past with this solution. This would force queries
>> looking
>>    for only core sources of change to provide an inclusive list of RC_*
>> values
>>    to find, rather than using rc_type != RC_EXTERNAL.
>>
>>
> Please don't repeat the mistake of having extension authors actually caring
> what their namespace number is. Everyone just goes "Oh, nobody's probably
> using 200 so I'll just do that."
>
> -Chad
+1

@Eric
The on-wiki list you talk about is here:
https://www.mediawiki.org/wiki/Extension_default_namespaces

"I have heard some mention that naming conflicts have occurred in the
past with this solution."
Yes there are plenty.
120-121 is used by both RefHelper and Rich Media
200-203 is used by SocialProfile and Data Import
300-301 is used by PollNY and Access Control List
Wikia also uses 300-399 when writing it's own extensions and doesn't
bother co-operating by at least adding the defaults they use to that
list to avoid conflicts.
500-501 is used by BlogPage and Linked Data
700-701 is used by LinkFilter and Collaboration
BlueSpice and BlogPage have a different type of conflict too. They BOTH
use the constant NS_BLOG and define different namespace defaults for it.

This on-wiki page is ONLY a registry of defaults. The standard practice
for these is that the starting number should be configurable so
namespace ids other than the default can be used to avoid conflicts. I'm
not so sure you'll be able to to that very well for RC external ids.

Anyways, this whole extension namespace id setup is considered a bug.
You don't want to get into this situation again.
We have an open bug on dropping this default namespace nonsense and
using dynamic registration of namespace IDs
https://bugzilla.wikimedia.org/show_bug.cgi?id=31063


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