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   urn    ( 7 )

унифицированный идентификатор ресурса (URI), включая URL или URN (uniform resource identifier (URI), including a URL or URN)
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Синопсис (Synopsis)

URI = [ absoluteURI | relativeURI ] [ "#" fragment ]


       absoluteURI = scheme ":" ( hierarchical_part | opaque_part )


       relativeURI = ( net_path | absolute_path | relative_path ) [ "?" query ]


       scheme = "http" | "ftp" | "gopher" | "mailto" | "news" | "telnet" |
                  "file" | "man" | "info" | "whatis" | "ldap" | "wais" | ...


       hierarchical_part = ( net_path | absolute_path ) [ "?" query ]


       net_path = "//" authority [ absolute_path ]


       absolute_path = "/"  path_segments


       relative_path = relative_segment [ absolute_path ]