Two level hierarchical typing scheme adopted of the form: basetype/subtype
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Seven base media types are defined this minimal set is enforced, i.e. all extensions must pass the whole ID->RFC->STD process.
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Allow for less restrictive subtyping the base types, for example:
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Content-Type: text/plain
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Content-Type: text/richtext
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Some standard subtypes are specified and many more are expected. New subtypes must be registered with the IANA (Internet Assigned Numbers Authority).
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Private experimental subtypes prefixed with "X-" may be used freely and without registration.
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Seven base types are: text, image, audio, video, multipart, message, application.
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