Re: [YANG] [sub]module name uniqueness

[Andy Bierman <ietf at andybierman.com>]

Phil Shafer wrote:
> Andy Bierman writes:
>>  1) modules and sub-module names are globally unique, and there can
>>     only 1 file that corresponds to a given import or include statement.
> 
> This would lead to scoped names ala java class names, giving us
> module names like "org.ietf.smi.interface-mib.yang".  This is
> partially elegant, but mostly verbose.
> 
>>  2) there is some proprietary mechanism to determine which file
>>     is requested when more than 1 corresponds to the import or include
>>     statement value.
> 
> This could be done with simple rules like:
> 
> - Imported modules must be found in a directory given via the
>   -I option.
> - Multiple -I options may be listed.
> - They are searched in the order they appear on the command
>   line.
> - Included submodules must be found in the same directory
>   as their module.
> 
> This makes "import" behave similarly to '#include <foo.h>'
> and "include" behave similarly to '#include "foo.h"'.
> (Yes, not exactly, but similar.)
> 
>>  3) there is some standard mechanism to determine which file
>>     is requested when more than 1 corresponds to the import or include
>>     statement value.
> 
> The standard doesn't need to talk about files, since your YANG IDE
> may keep all your modules in a database.  It's all implementation
> specific.

I don't see how a WG could ever publish
an RFC with FOO-MODULE in it if another RFC
already has a YANG module using that name.


> 
>> IMO, modules and submodules need to share the
>> same naming scope, and be globally unique.
> 
> Are we wiling to live with module names like "org.ietf.foo.bar.yang"?
> 

Why would we name modules like that?
There are 1000s of SMI modules and generating a
unique name with at most 64 unique characters has
not been a real problem in 2 decades.  I don't
think the problem will be any worse with at least 63
unique characters, as YANG mandates.


> Thanks,
>  Phil
> 
> 
> 

Andy

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