ebxml-msg — archive

[System]

multipart-body := [preamble CRLF] dash-boundary transport-padding CRLF body-part *encapsulation close-delimiter transport-padding [CRLF epilogue] From RFC 2046. And from RFC 2234 (ABNF syntax) The operator "*" preceding an element indicates repetition. The full form is: <a>*<b>element where <a> and <b> are optional decimal values, indicating at least <a> and at most <b> occurrences of element. Default values are 0 and infinity so that *<element> allows any number, including zero; 1*<element> requires at least one; 3*3<element> allows exactly 3 and 1*2<element> allows one or two. The syntax, as I decipher it, requires one body-part but zero or more encapsulations (which is what a second or nth body part is called). So multiparts with just one part are allowed. That does not settle what do in ebxml, but there is nothing "wrong" with a multipart with one body part.