[media-types] [IANA #1452675] application/vnd.cxtf reg istration request

Hi Alexey,

Sending a reminder for this request from May 28th. #1 of 2.

thanks,
Amanda

On Thu May 28 20:53:49 2026, amanda.baber wrote:
> Hi Alexey,
> 
> Can you review this request by June 11th? This is the first of two
> from this applicant.
> 
> He didn't want his addressed published on a mailing list, so I've
> partially redacted it here. If these are approved, we'll restore the
> address, but our email masking script will obscure the "@" symbol.
> 
> thanks,
> Amanda
> 
> =====
> 
> Media type name: application
> 
> Media subtype name: vnd.cxtf
> 
> Required parameters: N/A
> 
> Optional parameters: N/A
> 
> Encoding considerations: 8bit
> 
> CXTF files are plain text encoded in UTF-8 or ASCII, with lines
> separated by CRLF or LF. Lines may exceed 998 octets in files with
> long path strings or encoded text content.
> 
> Security considerations: CXTF files are plain-text vector map
> description files. They contain no executable content, no scripts, and
> no active content. They may reference external image files via
> relative paths; implementations should validate and sanitise these
> paths to prevent directory traversal. No privacy or integrity services
> are inherent in the format; where confidentiality is required,
> transport-level security (TLS) should be used.
> 
> Interoperability considerations: The format has evolved through
> versions CX10, CX20, and CXTF (3.x). Older files using the CX10/CX20
> header are a strict subset and are backward-compatible with CXTF
> parsers. The format uses $xx hex encoding for special characters in
> strings. Numeric values use invariant-culture decimal notation (period
> as separator).
> 
> Published specification: https://heightmap.org (format reference and
> embedding guide); ABNF grammar available at
> https://heightmap.org/docs/CXTF.abnf
> 
> Applications which use this media: CX Editor (Windows desktop
> application for authoring vector map files); the <cxtf-view> and
> <cxtf-tree> HTML5 web components (cxtf-renderer.js) for embedding CXTF
> maps in web pages.
> 
> Fragment identifier considerations: N/A
> 
> Restrictions on usage: None
> 
> Provisional registration? (standards tree only): No
> 
> Additional information:
> 
> 1. Deprecated alias names for this type: N/A
> 2. Magic number(s): CXTF (ASCII, at start of first non-comment line);
> older variants: CX10, CX20
> 3. File extension(s): .cxtf
> 4. Macintosh file type code: N/A
> 5. Object Identifiers: N/A
> 
> General Comments: The format has been in active use since 1992,
> originally as a binary format (CH5), evolving through plain-text
> versions CX10, CX20, and the current CXTF (3.x). It is designed for
> vector map authoring and web embedding. A formal ABNF grammar is
> maintained alongside the format specification at heightmap.org.
> 
> Person to contact for further information:
> 
> 1. Name: Stefan Gies
> 2. Email: [temporarily redacted] @stefan-gies.com
> 
> Intended usage: COMMON
> 
> Used for embedding and distributing vector map files on the web and in
> desktop applications. Suitable for use in HTTP content negotiation,
> <a> download links, and fetch() API responses.
> 
> Author/Change controller: Stefan Gies, independent developer —
> heightmap.org

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