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Church Of The
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4.2.11. Content-Id Connected: An Internet Encyclopedia
4.2.11. Content-Id

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4.2.11. Content-Id

4.2.11. Content-Id

The second scheme, "cid:", is similar to "mid:", but makes reference to a body part of a MIME message by the value of its content-id field. This allows, for example, a master document being the first part of a multipart/related MIME message to refer to component parts which are transferred in the same message.


Beware however, that content identifiers are only required to be unique within the context of a given MIME message, and so the cid: URL is only meaningful with the context the same MIME message. For a reference outside the message, it would need to be appended to the message-id of the whole message. A syntax for this has not been defined.

Next: 4.2.12. Schemes for Further Study

Connected: An Internet Encyclopedia
4.2.11. Content-Id


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