Bottom line is that IP-layer interception - even when done "right" -
has fairly limited applicability for location of nearby content.
Though the technique is so widely mis-applied that it might still be
useful to define what "right" means.
And there you have the argument for publishing this document.
no, this document doesn't try to do that - the protocol it proposes
is an attempt to work around one of the many problem associated
with interception proxies, but it's hardly a blueprint for how
to do them "right" (nor does it purport to be).
Keith