<!-- [rfced] Section 6. Would the following sentence work better as
an unordered list?
Current:
A _message_ consists of control data to describe and route the
message, a headers lookup table of key/value pairs for extending that
control data and conveying additional information about the sender,
message, content, or context, a potentially unbounded stream of
content, and a trailers lookup table of key/value pairs for
communicating information obtained while sending the content.
Perhaps:
A _message_ consists of the following:
* control data to describe and route the message,
* a headers lookup table of key/value pairs for extending that
control data and conveying additional information about the
sender, message, content, or context,
* a potentially unbounded stream of content, and
* a trailers lookup table of key/value pairs for communicating
information obtained while sending the content.
-->