The IESG has approved the following document: - 'Guidance on Designing Label Generation Rulesets (LGR) Supporting Variant Labels' (draft-freytag-lager-variant-rules-06.txt) as Informational RFC This document has been reviewed in the IETF but is not the product of an IETF Working Group. The IESG contact person is Alexey Melnikov. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-freytag-lager-variant-rules/ Technical Summary This document gives guidance on designing well-behaved Label Generation Rulesets (LGRs) that support variant labels. Typical examples of labels and LGRs are IDNs and zone registration policies defining permissible IDN labels. Variant labels are labels that are either visually or semantically indistinguishable from an applied for label and are typically delegated together with the applied-for label, or permanently reserved. While RFC7940 defines the syntactical requirements for specifying the label generation rules for variant labels, additional considerations apply that ensure that the label generation rules are consistent and well-behaved in the presence of variants. Working Group Summary This document was developed after the LAGER working group completed its work and was closed. Notice of the work was sent to the working group mailing list, but there was no interest in extending the work of the group to do this work. No controversial issues were identified. Document Quality The document largely reflects experience gathered from implementing RFC 7940 and creating rulesets based on it. No expert reviews are required, but the shepherd did solicit reviews from two knowledgeable IETF participants. Marc Blanchet identified the following implementations: Viagenie developed a front-end interface under ICANN contract that is now open-sourced (see https://github.com/icann/lgr-core, https://github.com/icann/lgr-django; Asmus Freytag as part of ICANN Integration Panel work (not released as far as we know); Wil Tan as part of ICANN Integration Panel work (not released as far as we know). Personnel Scott Hollenbeck is the Document Shepherd. Alexey Melnikov is the Responsible Area Director.
