[media-types] [IANA #1421602] application/vnd.nubaltec .nudoku-game registration request

Hi Alexey,

We have a response to the two comments about the "Additional Information" section:

===

>> Additional information:
>> 
>> 1. Deprecated alias names for this type: N/A
>> 2. Magic number(s): UTF-8 character sequence "ndkg" at the start of 
>> the file.
> 
> Is the file format pure JSON or does it include some header? If the
> former, I am not sure this is true.

The payload itself is in pure JSON, but it contains as the header a 
subset of the string pattern "ndgk[\u0020-\u007E]*\n", with the 
pattern-matching string representing the protocol specification for 
interpretation of the following json data. The frst two experimental 
content versions with a slightly different data layout look like
--------------
ndkg
{
...
}
--------------

and

--------------
ndkg2
{
...
}
--------------

> 3. File extension(s): .ndg
> It looks like this file extension is already used by one of Adobe image
> formats. I suggest a different file extension is to be used.

Yes, I was not really sure if this has to be in three letter format, I 
can live with .ndkg or .nudoku instead. .ndkg seems to be unused as far 
as I can see.

===

Do they need to update the magic number field? Do you have a recommendation for the file extension field?

If they agree, we'll go ahead and register this.

thanks,
Amanda

On Wed Aug 13 17:32:22 2025, [email protected] wrote:
> Hi Amanda,
> 
> Sorry for the delay on this one.
> 
> I have some non blocking comments for the requestor (see below), but
> in
> general this is reasonable to register.
> 
> On 20/06/2025 18:55, Amanda Baber via RT wrote:
> > Hi Alexey,
> >
> > New request here. Can you review this by July 4th?
> >
> > thanks,
> > Amanda
> >
> > =====
> >
> > Name: Peter Koellner
> >
> > Email:[email protected]
> >
> > Media type name: application
> >
> > Media subtype name: vnd.nubaltec.nudoku-game
> >
> > Required parameters: N/A
> >
> > Optional parameters: N/A
> >
> > Encoding considerations: binary
> >
> > Security considerations: This is a media type for sharing json-
> > encoded game files for our "nudoku" games on android/ios devices
> > between users of the application. It contains neither executable code
> > nor private information, but just the data required to reproduce a
> > game state. The files should be about 3-4 kB in size. Depending on
> > the operating system, existing security vulnerabilities of the
> > devices' json decoder and file i/o libraries may apply.
> >
> > Interoperability considerations: The media type contains a sudoku
> > board, its solution and some extra information, such as the game
> > difficulty level, as json-encoded arrays, strings, 1-digit integer
> > numbers and booleans. It may be opened in a text editor and read, but
> > is primarily designed to exchange game configurations between users
> > of the nudoku app.
> >
> > Published specification: "RFC publication of vendor and personal
> > media type registrations is allowed but not required."
> >
> > Applications which use this media: Our Android nudoku and nudoku+
> > applications let the user play sudoku games on their device. The
> > media type allows game setups to be shared between the users.
> >
> > Fragment identifier considerations: N/A
> >
> > Restrictions on usage: The file should only be downloaded or opened
> > with the nudoku/nudoku+ applications where available, but can be
> > opened with a text viewer/editor or third-party game applications
> > that can make use of the format.
> >
> > Provisional registration? (standards tree only): No
> >
> > Additional information:
> >
> > 1. Deprecated alias names for this type: N/A
> > 2. Magic number(s): UTF-8 character sequence "ndkg" at the start of
> > the file.
> 
> Is the file format pure JSON or does it include some header? If the
> former, I am not sure this is true.
> 
> > 3. File extension(s): .ndg
> It looks like this file extension is already used by one of Adobe
> image
> formats. I suggest a different file extension is to be used.
> > 4. Macintosh file type code: N/A
> > 5. Object Identifiers: N/A
> >
> > Person to contact for further information:
> >
> > 1. Name: Peter Koellner
> > 2. Email:[email protected]
> >
> > Intended usage: COMMON
> >
> > Author/Change controller: Nubaltec IT Consulting, S.L.
> > Peter Koellner
> > [email protected]
> > RT Version 5.0.3
> >
> >

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