https://www.ietf.org/ietf-ftp/internet-drafts/draft-bensley-rpsl-exclude-members-00.html
Explicitly excluding objects from RPSL sets
This document updates and by defining the excl-members attribute on as-set and route-set classes in the Routing Policy Specification Language (RPSL). The...
explicitlyexcludingobjectsrpslsets
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