European Ordering Rules - Method

Method

Just as for ISO/IEC 14651, upon which EOR is based, EOR has 4 levels of weights.

Level 1 sorts the letters. The following Latin letters are concerned by this level, in order:

a b c d e f g h i j k l m n o p q r s t u v w x y z þ

The Greek alphabet has the following order:

α β γ δ ε Ϝ Ϛ ζ η θ ι κ λ μ ν ξ ο π Ϟ ρ σ τ υ φ χ ψ ω Ϡ

Cyrillic script has the following order:

а ӑ ӓ ә ӛ ӕ б в г ғ ҕ д ђ ҙ е ӗ є ж ӝ җ з ӟ s ӡ и ӥ і ї й ј к қ ӄ ҡ ҟ ҝ л љ м н ң ӊ ҥ њ о ӧ ө ӫ п ҧ р с ҫ т ҭ ћ у ў ӱ ӳ ү ұ ф х ҳ һ ц ҵ ч ӵ ҷ ӌ ҹ ҽ ҿ џ ш щ ъ ы ӹ ь э ю я ҩ Ӏ

The order for the three alphabets is:

1. Latin alphabet
2. Greek alphabet
3. Cyrillic alphabet

The Georgian and Armenian alphabets have not been included in ENV 13710. However, they are covered in CR 14400:2001 "European ordering rules – Ordering for Latin, Greek, Cyrillic, Georgian and Armenian scripts". Note also that all scripts encoded in ISO/IEC 10646 and Unicode are covered by ISO/IEC 14651 (and its datafile CTT) as well as Unicode Collation Algorithm (UCA and the associated DUCET), both of which are available at no charge.

Level 2 is where different additions, such as diacritics and variations, to the letters are ordered. Letters with diacritical marks (like ⟨å⟩, ⟨ä⟩, ⟨ö⟩, and ⟨ø⟩) are ordered as variants of the base letter. ⟨æ⟩, ⟨œ⟩, ⟨ij⟩ and ⟨ŋ⟩ are ordered as modifications of ⟨ae⟩, ⟨oe⟩, ⟨ij⟩ and ⟨n⟩ respectively, similarly for similar cases.

Level 2 defines the following order of diacritics and other modifications:

1. Acute accent (á)
2. Grave accent (à)
3. Breve (ă)
4. Circumflex (â)
5. Hacek (háček) (š)
6. Ring (å)
7. Trema (ä)
8. Double acute accent (ő)
9. Tilde (ã)
10. Dot (ż)
11. Cedilla (ş)
12. Ogonek (ą)
13. Macron (ā)
14. With stroke through (ø)
15. Modified letter(s) (æ)

Level 3 makes the distinction between Capital and small letters, as in "Polish" and "polish".

Level 4 concerns punctuation and whitespace characters. This level makes the distinction between "MacDonald" and "Mac Donald", "its" and "it's".

An optional, and usually omitted, fifth level can distinguish typographical differences, including whether the text is italic, normal or bold.