Technical Summary
Historically, designers and implementers of application protocols
have often distinguished between "standard" and "non-standard"
parameters by prefixing the latter with the string "X-" or similar
constructions. In practice, this convention causes more problems
than it solves. Therefore, this document deprecates the "X-"
convention for newly defined textual parameters in application
protocols.
Working Group Summary
The WG discussed the scope of the document, in particular if it
intends to change any existing IANA registries which use "X-"
namespace (or similar) and whether it applies to registries that
use numeric values. As per WG discussion, the answer to both
questions above is "no" and the document was clarified to reflect
that.
Document Quality
The document doesn't define a protocol. At least 1 specification already
voluntarily conforms to the recommendations specified in the document.
Personnel
Alexey Melnikov <alexey.melnikov@isode.com> is the document shepherd.
Pete Resnick <presnick@qualcomm.com> is the cognizant AD.