This paper discusses the various naming and addressing
systems used to identify and locate resources in the digital
environment. There are various schemes that have been
developed for this purpose, like, URL, URN, URC schemes
developed by the IETF (Internet Engineering Task Force),
PURL developed at OCLC. The publishing industry also has
developed the Digital Object Identifier (DOI), which is being
used for rights management of intellectual property. The
specifications and the working of URLs, URNs, PURLs,
Handles and DOIs are discussed in detail in this paper