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url: Introduction

 
 1 Introduction
 **************
 
 A “Uniform Resource Identifier” (URI) is a specially-formatted name,
 such as an Internet address, that identifies some name or resource.  The
 format of URIs is described in RFC 3986, which updates and replaces the
 earlier RFCs 2732, 2396, 1808, and 1738.  A “Uniform Resource Locator”
 (URL) is an older but still-common term, which basically refers to a URI
 corresponding to a resource that can be accessed (usually over a
 network) in a specific way.
 
    Here are some examples of URIs (taken from RFC 3986):
 
      ftp://ftp.is.co.za/rfc/rfc1808.txt
      http://www.ietf.org/rfc/rfc2396.txt
      ldap://[2001:db8::7]/c=GB?objectClass?one
      mailto:John.Doe@example.com
      news:comp.infosystems.www.servers.unix
      tel:+1-816-555-1212
      telnet://192.0.2.16:80/
      urn:oasis:names:specification:docbook:dtd:xml:4.1.2
 
    This manual describes the ‘url’ library, an Emacs Lisp library for
 parsing URIs and retrieving the resources to which they refer.  (The
 library is so-named for historical reasons; nowadays, the “URI”
 terminology is regarded as the more general one, and “URL” is
 technically obsolete despite its widespread vernacular usage.)
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