HTML [RFC 1866] defines a powerful means of specifying multimedia documents. These multimedia documents consist of a text/html root resource (object) and other subsidiary resources (image@ video clip@ applet@ etc. objects) referenced by Uniform Resource Identifiers (URIs) within the text/html root resource. When an HTML multimedia document is retrieved by a browser@ each of these component resources is individually retrieved in real time from a location@ and using a protocol@ specified by each URI. In order to transfer a complete HTML multimedia document in a single e-mail message@ it is necessary to: a) aggregate a text/html root resource and all of the subsidiary resources it references into a single composite message structure@ and b) define a means by which URIs in the text/html root can reference subsidiary resources within that composite message structure. This document a) defines the use of a MIME multipart elated structure to aggregate a text/html root resource and the subsidiary resources it references@ and b) specifies a MIME content-header (Content-Location) that allow URIs in a multipart elated text/html root body part to reference subsidiary resources in other body parts of the same multipart elated structure. While initially designed to support e-mail transfer of complete multi-resource HTML multimedia documents@ these conventions can also be employed to resources retrieved by other transfer protocols such as HTTP and FTP to retrieve a complete multi-resource HTML multimedia document in a single transfer or for storage and archiving of complete HTML-documents. Differences between this and a previous version of this standard@ which was published as RFC 2110@ are summarized in chapter 12.