ISO

(from the home page)

The URI for a Code defined by ISO standards is defined in the RFC5141, by using the URL of ISO followed by the Code, as:
LEI -> http://standards.iso.org/iso/17442/{LEI code}
ISIN -> http://standards.iso.org/iso/6166/{ISIN code}

See below RFC 5141, ISO URN Schema, March 2008, Page 16:

2.8. Process for Identifier Resolution
Resolving document identifiers:
This schema has been developed with the intent that a URN identifying an ISO document can be transformed to a valid http URI by replacing the requested URN namespace prefix (“iso”) and the “std:” prefix with the domain name “standards.iso.org”, replacing all occurrences of “:” within the identifier with “/”, and converting characters to lowercase. (ISO is planning to develop a website implementation to support these URIs.)
Examples:
urn:iso:std:iso:9999:-1:ed-1:en: corresponds to http://standards.iso.org/iso/9999/-1/ed-1/en/
urn:iso:std:iso-iec:tr:9999:-1:ed-1:en: corresponds to http://standards.iso.org/iso-iec/tr/9999/-1/ed-1/en/ urn:iso:std:iso:9999:-1:ed-2:en,fr:amd:2: corresponds to http://standards.iso.org/iso/9999/-1/ed-2/en,fr/amd/2/

ISO developed a website implementation to support these URIs at http://standards.iso.org/iso, but the standards  ISO 17442 (LEI code)  and ISO 6166 (ISIN code) were still to be implemented in it.  (last visit  at 2014/03/01) . 

Example using XBRL notation for LEI-based entity identification:
—     <xbrli:entity>
—        <xbrli:identifier scheme=”http://standards.iso.org/iso/17442″>
—               KGCEPHLVVKVRZYO1T647
—         </xbrli:identifier>
—      <xbrli:entity>

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