What is MIME type "application/atomcat+xml"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

The MIME type application/atomcat+xml defines an XML document used to list and organize categories for Atom feeds. This type is part of the Atom Publishing Protocol family, which standardizes how clients discover allowed categories on a server.
It lets client applications query a server for a set of category terms applicable to content submissions.

Key uses include:

• Content categorization – Enables grouping of entries for better organization.
• Service discovery – Allows clients to find which categories are supported.
• Interoperability – Ensures that Atom-based systems handle category data consistently.

Files using this MIME type may appear with the extension ATOMCAT.
For more details on the protocol, refer to the Atom Publishing Protocol (RFC 5023).

Associated file extensions

.atomcat

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:

    Content-Type: application/atomcat+xml    
  

HTML

In HTML, you can specify the MIME type in various elements:

    <a href="file.dat" type="application/atomcat+xml">Download file</a>    
  

Server-side (Node.js)

Setting the Content-Type header in Node.js:

    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'application/atomcat+xml');    
      res.end('Content here');    
    }).listen(3000);    
  

Associated file extensions

.atomcat