Variant sets
German (language) — Second-Level Reference Label Generation Rules, 25 October 2024
Code points grouped into sets of mutual variants. Every member of a set produces the same set of variant labels, so a registration of one has implications for all the others. Sets of a single member are omitted, as are the identity mappings RFC 7940 requires each member to declare.
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ssß
Source Direction Target Disposition Ref Comment ss U+0073 + U+0073 ⇆ ß U+00DF → blocked ← fallback conditional IDNA2003 Compatibility ↔ declared both ways ⇆ both ways, different disposition each way → one direction only