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7.8. Experimental Content-Type Values Connected: An Internet Encyclopedia
7.8. Experimental Content-Type Values

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7.8. Experimental Content-Type Values

7.8. Experimental Content-Type Values

A Content-Type value beginning with the characters "X-" is a private value, to be used by consenting mail systems by mutual agreement. Any format without a rigorous and public definition must be named with an "X-" prefix, and publicly specified values shall never begin with "X-". (Older versions of the widely-used Andrew system use the "X-BE2" name, so new systems should probably choose a different name.)

In general, the use of "X-" top-level types is strongly discouraged. Implementors should invent subtypes of the existing types whenever possible. The invention of new types is intended to be restricted primarily to the development of new media types for email, such as digital odors or holography, and not for new data formats in general. In many cases, a subtype of application will be more appropriate than a new top-level type.

Next: 8. Summary

Connected: An Internet Encyclopedia
7.8. Experimental Content-Type Values


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