[1] RDF Literals and Base Directions (2019-06-14 03:20:23 +09:00) https://w3c.github.io/rdf-dir-literal/#private-tag

[2] Proposal: find a transitional solution before updating langString · Issue #13 · w3c/rdf-dir-literal (2019-06-21 14:35:30 +09:00) https://github.com/w3c/rdf-dir-literal/issues/13

[3] In defense of extending language tags · Issue #3 · w3c/rdf-dir-literal (2019-06-24 20:14:52 +09:00) https://github.com/w3c/rdf-dir-literal/issues/3#issuecomment-496994496

[4] draft-msporny-d-langtag-ext-00 - BCP 47 Extension D (2019-06-24 06:47:34 +09:00) https://tools.ietf.org/html/draft-msporny-d-langtag-ext-00