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Lex is a URN namespace, a type of Uniform Resource Name (URN), that allows accurate identification of laws and other legal norms.
LexML Brazil and Italy (Civil law countries) already officially recognize the URN LEX standard draft v0.9, as a namespace for sources of law.
The identifier has a hierarchical structure as follows: [1]
"urn:lex:"<NSS>
where NSS is the Namespace Specific String composed as follows:
<NSS>::=<jurisdiction>":"<local-name>
where:
Illustrative examples of sources of law identified by lex URNs:
urn:lex:it:stato:legge:2003-09-21;456 (Italian act) urn:lex:fr:etat:lois:2004-12-06;321 (French act) urn:lex:es:estado:ley:2002-07-12;123 (Spanish act) urn:lex:ch:glarus:regiere:erlass:2007-10-15;963 (Glarus Swiss Canton decree) urn:lex:eu:council:directive:2010-03-09;2010-19-UE (EU Council Directive) urn:lex:us:federal.supreme.court:decision:1963-03-18;372.us.335 (US FSC decision)
Real URN LEX resolver at Brazil, the country where URN LEX was adopted since 2009, with the LexML.gov.br portal:
URNs are used as unique identifiers (unique IDs), like using ISBN to identify books. The URN is also nominated as a "public (unique) ID". In that kind of public use, the need for a central authority las a unique and necessary URN-resolver is a problem. In that context, the identifier's user must query the authority about the correct ID from some object's metadata, like year or title. IDs like ISBN, which need a central authority, are also named "opaque IDs".
A common use of Lex URNs is to express "transparent identifiers", which can be built up by simple rules or inferences from basic metadata. For example, the Brazilian Lex URN is used for both legislative and case law unique and universal identifier, using rules of formatting and abbreviation of the authority's name, the publication date, and the local identifier in the title of the document.
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A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the urn
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Eur-Lex is an official website of European Union law and other public documents of the European Union (EU), published in 24 official languages of the EU. The Official Journal (OJ) of the European Union is also published on EUR-Lex. Users can access EUR-Lex free of charge and also register for a free account, which offers extra features.
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