URI Resource Pages
About URIs: Basic
definitions and concepts; URI schemes; what URIs actually do; relationships
among URIs, URLs, and URNs.
'info' Scheme: More
detailed description about this specific scheme, which is important
within the library and publishing communities.
URI Syntax: A
summary of the URI generic syntax.
Latest News: We will
try to track the latest URI developments.
A URI -- Uniform Resource Identifier -- is a character
string that serves to identify (or locate, retrieve, dereference)
a resource. Its definition is discussed further in About
URI syntax is discussed in URI
Generic Syntax .
A URI is distinguished by its scheme; for example, for
the URI http://www.loc.gov the scheme is 'http'. URI schemes
are discussed further in About
URIs, but basically:
- A URI begins with a scheme name,
- the scheme name is followed by a colon (':'),
- and the remainder of the uri is "scheme specific" --
its interpretation depends on the scheme.
The "Important" Schemes
Two important URI schemes (for libraries) are:
- 'http', the single most fundamentally important
uri scheme for the web; and
- 'info', a URI scheme of growing importance
to the library and publishing community.
There are other important schemes, but (for now) we will focus
on these two -- 'info' in particular, as 'http' is almost universally
well-understood and we needn't describe it further. The 'info'
scheme is discussed in detail in 'info'
These pages are maintained at the Library of Congress by the
Network Development and MARC Standards Office, as part of its
participation in the IFLA CDNL Alliance for Digital Strategies
(ICADS), to provide information relevant to the library community
about URIs, identifiers, locators, and related concepts. Comments,
corrections, and suggestions are welcome; please email [email protected].