[media-types] [IANA #1443379] Registration of MIME media type application/vnd.phbk+xml

Hi Darrel,

Sending a reminder for this request from February 6th (PST).

thanks,
Amanda

On Sat Feb 07 04:36:18 2026, amanda.baber wrote:
> Hi Darrel,
> 
> Could you review this one for us by February 20th?
> 
> This was initially based on an older version of the registration
> template, so you might want to check that we've captured all of the
> fields.
> 
> thanks,
> Amanda
> 
> =====
> 
> Type name: application
> 
> Subtype name: vnd.phbk+xml
> 
> Required parameters: charset (Encoding: UTF-8)
> 
> Optional parameters: N/A
> 
> Encoding considerations: 8bit
> 
> Since this is a text-based XML format, 8bit encoding is sufficient for
> transporting contact data like names and addresses.
> 
> Security considerations: The .phbk format is a non-executable, text-
> based XML structure used for storing contact information such as phone
> numbers, emails, and physical addresses. It does not contain active
> content, scripts, or macros. There is no risk of code execution on the
> host machine.
> 
> Interoperability considerations: This format is designed to be parsed
> by any XML-compliant software. It has been tested on mobile platforms
> (Android) and desktop systems to ensure consistent data rendering.
> 
> Published specification: https://github.com/afifashamsadvivo/phbk
> 
> Applications that use this media type: Custom phonebook managers and
> contact backup utilities.
> 
> Fragment Identifier Considerations: The .phbk file type does not use
> or require fragment identifiers. It is intended for custom
> configurations and data storage in AI-based systems, not for
> referencing specific document fragments.
> 
> Restrictions on Usage: The .phbk file type is primarily intended for
> use in technical environments related to AI projects. It is not
> designed for general public use or non-technical applications.
> 
> Additional information:
> 
> Deprecated Alias Names: There are no deprecated alias names for the
> .phbk file type.
>   Magic number(s): None. Identification is based on the .phbk file
> extension or the <phonebook> root element.
> File extension(s): .phbk
> Macintosh file type code(s): TEXT
> 
> Person & email address to contact for further information:
> 
> afifashamsadvivo - [email protected]
> 
> Intended usage: COMMON
> 
> Author/Change controller: afifashamsadvivo

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