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 | | In general, the top-level media type is used to declare the general type of data, while the subtype specifies a specific format for that type of data. |
 | | Three parameters must be specified in the Content-Type field of type "message/partial": The first, "id", is a unique identifier, as close to a world-unique identifier as possible, to be used to match the fragments together. |
 | | Like the "message/partial" type, the "message/external-body" media type is intended to be transparent, that is, to convey the data type in the external body rather than to convey a message with a body of that type. |
| www.ietf.org /rfc/rfc2046.txt (12769 words) |
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