urnisbn0451450523

urn:isbn:0451450523 is a Uniform Resource Name in the ISBN namespace. It encodes the ten-digit ISBN 0451450523, which uniquely identifies a bibliographic item registered in the International Standard Book Number system. The ISBN-10 form is a numeric identifier that encodes a registration group, a publisher code, an item number, and a check digit. In practice, the URN urn:isbn:0451450523 can be used in bibliographic databases, library catalogs, and digital libraries to refer unambiguously to that item, regardless of its current location.

Background and scope: The ISBN URN namespace is defined to provide persistent naming for books and related works, independent of where the item is hosted or accessed. The namespace for ISBNs is described in standards such as RFC 3151, which specifies how to format and validate an ISBN-based URN. The URN form is intended to be stable over time and interoperable across systems that manage bibliographic data.

Resolution and use: The URN itself does not reveal bibliographic details. To obtain the title, author, publisher, and publication year, one must query bibliographic registries or catalogs that map the ISBN to its metadata, such as WorldCat, national libraries, or the International ISBN Agency’s records. If the item has multiple editions, each edition may have a different ISBN, and the URN would reference the specific edition’s identifier.

Limitations: A URN identifies a bibliographic item but does not provide a direct link to a current online location. Users should consult reputable catalogues to retrieve comprehensive bibliographic information corresponding to the ISBN 0451450523.

See also: ISBN, Uniform Resource Name, RFC 3151.