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Requirements for IDN and its Implementations from Japan

Requirements for IDN and its Implementations from Japan. Yoshiro YONEYA <yone@nic.ad.jp> JPNIC IDN-TF / NTT Software Co. Contents. Scope Requirements for IDN Requirements for IDN Implementations Two experimental implementations of JPNIC Reference. Requirements. (Core) Protocol.

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Requirements for IDN and its Implementations from Japan

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  1. Requirements for IDN and its Implementations from Japan Yoshiro YONEYA <yone@nic.ad.jp> JPNIC IDN-TF / NTT Software Co. IETF IDN-WG

  2. Contents • Scope • Requirements for IDN • Requirements for IDN Implementations • Two experimental implementations of JPNIC • Reference IETF IDN-WG

  3. Requirements (Core) Protocol Domain Name (Structure, etc.) Implementations Scope • Clarify our Requirements for IDN • Discuss about Implementations of IDN IETF IDN-WG

  4. Requirements for IDN • IDN should be naturally readable and/or writable in its language context • IDN should not require usersto specify ZLD • Current ASCII-only Domain Name should be usable in any language context • But, IDN should not depend on natural language structure • Word order, word separator, writing direction, etc. IETF IDN-WG

  5. Requirements for IDN (Cont.) • IDN should be a common framework to make localization easy • Distinguish or unify of differences between characters should be a local (language depend) issue • Examples in Japanese: ｱ (U+FF71)ア (U+30A2) (half-width vs. full-width) A (U+0041)Ａ (U+FF21) (half-width vs. full-width) ア (U+30A2)あ (U+3042) (katakana vs. hiragana) • Guidelines for each language to deal with such issues should be documented inan RFC • Set of characters usable as IDN label, canonicalization/normalization rule, etc. IETF IDN-WG

  6. Requirements for IDN (Cont.) • IDN should have enough length to store long labels • JPNIC in Japanese is 社団法人日本ネットワークインフォメーションセンター • Each IDN should have a corresponding ASCII-only domain name • CNAME / DNAME like aliasing should be used to define IDN • Reverse mapping should produce 1 or more ASCII-only name • IDN character encoding should be stateless • UTF-8 is desirable IETF IDN-WG

  7. Requirements for Implementations • Internationalization rules should be solved in DNS servers, localization rules should be solved in clients (resolvers) • IDN capable DNS servers should not have regional dependence • Maintenance supporting tools for IDN capable DNS servers may have regional dependence • Conversion of charset and canonicalization and/or normalization should be done on the client side before query • Proxy servers near clients may do them IETF IDN-WG

  8. Requirements for Implementations (Cont.) • IDN capable DNS servers should be fully upper compatible with current DNS • Difference should be whether it can hold IDN • New RRs such as to hold language selector should be examined • Protocol extensions may be needed to distinguish languages strictly IETF IDN-WG

  9. Requirements for Implementations (Cont.) • Applications and resolvers should be 8bit through • DNS protocol [RFC1035] is already 8bit through • Prepare for migration/transition tools and/or proxy servers to prevent initial confusion • URL character code converter, DNS proxy, etc. • We should discuss about migration/transition strategy like IPv6 IETF IDN-WG

  10. Two experimental implementations of JPNIC • IDNX/idnx-jp • Proxy DNS server • Accepts Japanese local charsets and converts them into UTF-5 • Uses ZLD • Worked well near clients side • GDNS • 8bit through based on BIND • Uses CNAME for multilingual labels • Not uses ZLD • Worked well even in reverse mapping IETF IDN-WG

  11. Reference • JPNIC IDN-TF WebPage • http://www.nic.ad.jp/en/research/idn/index.html IETF IDN-WG

  12. Questions? IETF IDN-WG

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