draft-kerwin-file-scheme-09

draft-kerwin-file-scheme-09
Independent Submission M. Kerwin
Internet-Draft QUT
Intended status: Standards Track December 11, 2013
Expires: June 14, 2014
The 'file' URI Scheme
draft-kerwin-file-scheme-09
Abstract

This document specifies the file Uniform Resource Identifier (URI)
scheme that was originally specified in
RFC 1738
. The purpose of
this document is to keep the information about the scheme on
standards track, since
RFC 1738
has been made obsolete, and to
promote interoperability by resolving disagreements between various
implementations.

Note to Readers

This draft should be discussed on its github project page [
github
].

Status of This Memo

This Internet-Draft is submitted to IETF in full conformance with the
provisions of
BCP 78
and
BCP 79

Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at

Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."

This Internet-Draft will expire on June 14, 2014.

This document is subject to
BCP 78
and the IETF Trust's Legal
Provisions Relating to IETF Documents
) in effect on the date of
publication of this document. Please review these documents
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carefully, as they describe your rights and restrictions with respect
to this document.

Table of Contents
. Introduction . . . . . . . . . . . . . . . . . . . . . . . .
1.1
. History . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
. Conventions and Terminology . . . . . . . . . . . . . . .
. Scheme Definition . . . . . . . . . . . . . . . . . . . . . .
2.1
. Components . . . . . . . . . . . . . . . . . . . . . . .
2.2
. Syntax . . . . . . . . . . . . . . . . . . . . . . . . .
. Implementation Notes . . . . . . . . . . . . . . . . . . . .
3.1
. Leading Slash . . . . . . . . . . . . . . . . . . . . . .
3.2
. Hierarchical Structure . . . . . . . . . . . . . . . . .
3.3
. Absolute and relative file paths . . . . . . . . . . . .
3.4
. Drive Letters . . . . . . . . . . . . . . . . . . . . . .
3.5
. UNC File Paths . . . . . . . . . . . . . . . . . . . . .
3.5.1
. Historical Issues with UNC File Paths . . . . . . . .
11
3.6
. Namespaces . . . . . . . . . . . . . . . . . . . . . . .
11
. Encoding and Character Set Considerations . . . . . . . . . .
11
. Security Considerations . . . . . . . . . . . . . . . . . . .
12
. IANA Considerations . . . . . . . . . . . . . . . . . . . . .
12
6.1
. URI Scheme Name . . . . . . . . . . . . . . . . . . . . .
12
6.2
. Status . . . . . . . . . . . . . . . . . . . . . . . . .
12
6.3
. URI Scheme Syntax . . . . . . . . . . . . . . . . . . . .
12
6.4
. URI Scheme Semantics . . . . . . . . . . . . . . . . . .
12
6.5
. Encoding Considerations . . . . . . . . . . . . . . . . .
12
6.6
. Applications/Protocols That Use This URI Scheme Name . .
13
6.7
. Interoperability Considerations . . . . . . . . . . . . .
13
6.8
. Security Considerations . . . . . . . . . . . . . . . . .
13
6.9
. Contact . . . . . . . . . . . . . . . . . . . . . . . . .
13
6.10
. Author/Change Controller . . . . . . . . . . . . . . . .
13
6.11
. References . . . . . . . . . . . . . . . . . . . . . . .
14
. Acknowledgements . . . . . . . . . . . . . . . . . . . . . .
14
. References . . . . . . . . . . . . . . . . . . . . . . . . .
14
8.1
. Normative References . . . . . . . . . . . . . . . . . .
14
8.2
. Informative References . . . . . . . . . . . . . . . . .
15
. Introduction
The 'file' URI scheme has historically had little or no
interoperability between platforms. Further, implementers on a
single platform have often disagreed on the syntax to use for a
particular filesystem. This document attempts to resolve those
problems, and define a standard scheme which is interoperable between
different extant and future implementations. Additionally, it aims
to ease implementation by conforming to a general syntax that allows
existing URI parsing machinery to parse 'file' URIs.
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URIs were previously defined in [
RFC1738
], which was updated by
RFC3986
]. Those documents also specify how to define schemes for
URIs.

The first definition for many URI schemes appeared in [
RFC1738
].
Because that document has been made obsolete, this document copies
the 'file' URI scheme from it to allow that material to remain on
standards track.
1.1
. History
This section is non-normative.

The 'file' URI scheme was first defined in [
RFC1630
], which, being an
informational RFC, does not specify an Internet standard. The
definition was standardised in [
RFC1738
], and the scheme was
registered with the Internet Assigned Numbers Authority (IANA)
IANA-URI-Schemes
]; however that definition omitted certain language
included by former that clarified aspects such as:

o the use of slashes to donate boundaries between directory levels
of a hierarchical file system; and

o the requirement that client software convert the 'file' URI into a
file name in the local file name conventions.

The Internet draft [I-D.
draft-hoffman-file-uri
] was written in an
effort to keep the 'file' URI scheme on standards track when
RFC1738
] was made obsolete, but that draft expired in 2005. It
enumerated concerns arising from the various, often conflicting
implementations of the scheme. It serves as the basis of this
document.

The 'file' URI scheme defined in [
RFC1738
] is referenced three times
in the current URI Generic Syntax standard [
RFC3986
], despite the
former's obsoletion:

1.
Section 1.1
uses "file:///etc/hosts" as an example for
identifying a resource in relation to the end-user's local
context.

2.
Section 1.2.3
mentions the "file" scheme regarding relative
references.

3.
Section 3.2.2
says that '...the "file" URI scheme is defined
so that no authority, an empty host, and "localhost" all mean the
end-user's machine...'.
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Finally the WHATWG defines a living URL standard [
WHATWG-URL
], which
includes algorithms for interpreting file URIs (as URLs).
1.2
. Conventions and Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [
RFC2119
].
. Scheme Definition
The 'file' URI scheme is used to identify and retrieve files
accessible on a particular host computer, where a "file" is a named
resource which can be accessed through the computer's filesystem
interface. These file names are interpreted from the perspective of
the user of a reference, rather than in relation to a globally-
defined naming authority, so care ought to be taken when distributing
'file' URIs to ensure that such references are actually intended to
be interpreted in relation to the end user's filesystem interface.

This scheme, unlike most other URI schemes, does not identify a
resource that is universally accessible over the Internet.

The mechanism for retrieving a representation of a dereferenced
'file' URI is through the computer's filesystem interface; for
example using the POSIX "open", "read" and "close" functions [
POSIX
].

Also note that 'file' and 'ftp' URIs are not the same, even when the
target of the 'ftp' URI is the local host.
2.1
. Components
The 'file' URI scheme conforms with the generic structure defined in
RFC3986
], and can be described in terms of its components:

Scheme The literal value "file"

Authority The authority component of a 'file' URI describes the
machine or system on which the file is accessible. If the
authority refers to a remote system, from the point of view of the
user of the URI, the implication is that the file system cannot be
accessed, or perhaps that some other mechanism must be used to
access the file. It does not imply that the file ought to be
accessible over a network connection. No retrieval mechanism for
files stored on a remote machine is defined by this specification.

The authority component is optional in a 'file' URI.
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If present it is either: one of the special values "localhost" or
the empty string (""); or the host name of the system on which the
file is accessible.

If the authority component is omitted, or has either of the
special values "localhost" or the empty string (""), it is
interpreted as "the machine from which the URI is being
interpreted".

Path The path component of a 'file' URI describes the hierarchical
directory path to the file, using the slash ("/") character to
separate directories. Implementations SHOULD translate between
the slash-separated URI syntax and the local system's conventions
for specifying file paths, where they differ. (See:
Section 3.2

Note that the leading slash, if any, is included in the path
value. This is in accordance with the generic syntax provided in
RFC3986
], but at odds with the definition of the "url-path" given
in
Section 3.1 of [RFC1738]
. See discussions in
Section 3
for
the effect this has on Microsoft DOS and Windows drive letters,
and on UNC file paths.

Some systems allow 'file' URIs to refer to directories. In this
case, implementations MAY include a terminating slash character in
the path, such as in:

file:///usr/local/bin/

The presence of a terminating slash character always indicates
that the 'file' URI refers to a directory, but the absence of a
slash does not necessarily indicate that it refers to a filesystem
object other than a directory. Implementations MUST NOT include a
trailing slash in any 'file' URIs they generate that do not refer
to a directory, and ought to use other mechanisms to detect
directories in any 'file' URIs they receive, if and when such
detection is required.

Query The query component of a 'file' URI contains non-hierarchical
data that, along with data in the path component, serves to
identify a file. For example, in a versioning file system, the
query component might be used to refer to a specific version of a
file.

Few implementations are known to use or support query components
in 'file' URIs.

Fragment The semantics of a fragment component are undefined by this
specification. A protocol that employs 'file' URIs MAY define its
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own semantics for fragment components in the context of that
protocol.

Previous definitions of the 'file' URI scheme required two (or three)
slashes between the scheme and path, so implementations that wish to
remain interoperable with older implementations ought to include an
authority component in any 'file' URIs they generate. See also:
Section 3.1
2.2
. Syntax
The 'file' URI syntax is defined here in Augmented Backus-Naur Form
(ABNF) [
RFC5234
], including the core ABNF syntax rule 'ALPHA' defined
by that specification, and borrowing the 'host', 'path-absolute' and
'segment' rules from [
RFC3986
] (as updated by [
RFC6874
]).

fileURI = "file" ":" ( auth-file / local-file )

auth-file = "//" ( host-file / nohost-file )

host-file = hostpart path-absolute
; file:///
; file://localhost/

nohost-file = path-abs ; begins with "/"
/ path-abs-win ; begins with drive-letter
; file:///
; file:////
; file://c:/ *

local-file = path-absolute ; file:/
/ path-abs-win ; file:c:/

hostpart = "localhost" / host

path-abs = 1*( "/" segment )

path-abs-win = drive-letter path-absolute
drive-letter = ALPHA [ drive-marker ]
drive-marker = ":" / "|"

* The 'no-host-file' rule allows for dubious URIs that encode a
Windows drive letter as the authority component. See:
Section 3.4

Note the difference between the "path-abs" and "path-absolute" rules:
only the former allows a zero-length first segment followed by a
slash, e.g. "//foo/bar"
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Systems exhibit different levels of case-sensitivity.
Implementations SHOULD maintain the case of file and directory names
when translating 'file' URIs to and from the local system's
representation of file paths, and any systems or devices that
transport 'file' URIs SHOULD NOT alter the case of 'file' URIs they
transport.
. Implementation Notes
3.1
. Leading Slash
The historical definition of 'file' URIs stated that "... the "/"
between the host (or port) and the url-path is NOT part of the url-
path",
[RFC1738], Section 3.1
, and that the "... can be
... the empty string",
[RFC1738], Section 3.10

The implication of this definition is that absolute file paths in a
UNIX-like environment, when encoded as 'file' URIs, ought to have
begin with "file:////". This rarely, if ever, eventuated, and
historically 'file' URIs interpreted in UNIX-like environments have
included the first slash as part of the file path. This is
compatible with the updated generic syntax provided in [
RFC3986
].

In Microsoft DOS- and Windows-based systems the historical definition
resulted in 'file' URIs of the form

file:///c:/path/to/file

This structure, with an empty host/authority, can be mapped directly
to the the updated generic syntax provided in [
RFC3986
] by omitting
the authority entirely; for example:

file:c:/path/to/file

However the same is not true for a URI with a non-empty authority.
For example:

file://smb.example.com/c:/path/to/file

As such, and to maintain interoperability with existing
implementations, and with any historically-generated static URIs,
implementations likely to interact with Microsoft DOS and Windows
file systems SHOULD ignore the leading slash in the path component of
any 'file' URIs they receive, where an authority component is
included (even if it is blank) and the first path segment is a drive
letter.

See
Section 3.4
below for discussion on recognising drive letters.
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3.2
. Hierarchical Structure
Most implementations of the 'file' URI scheme do a reasonable job of
mapping the hierarchical part of a directory structure into the slash
("/") delimited hierarchy of the URI syntax, independent of the
native platform's delimiter.

For example, on Microsoft Windows platforms, it is typical that the
file system presents backslash ("\") as the file delimeter for file
names, yet the URI's forward slash ("/") can be used in 'file' URIs
interpreted on those platforms. Similarly, on (some) Macintosh OS
versions, at least in some contexts, the colon (":") is used as the
delimiter in the native presentation of file path names. Unix
systems natively use the same forward slash ("/") delimiter for
hierarchy, so there is a closer mapping between 'file' URI paths and
native path names.

In accordance with
Section 3.3 of [RFC3986]
, the path segments
"." and "..", also known as dot-segments, are only interpreted within
the URI path hierarchy and are removed as part of the resolution
process (
[RFC3986], Section 5.2
). Implementations operating on
or interacting with systems that allow dot-segments in their native
path representation may be required to escape those segments using
some other means when translating to and from 'file' URIs.
3.3
. Absolute and relative file paths
The conventions for specifying absolute file paths differ from system
to system. For example, in a UNIX-based system an absolute file path
begins with a slash ("/") character, denoting the root of the
filesystem, whereas on a Microsoft DOS- or Windows-based system an
absolute file path begins with a drive letter (e.g. "c:\").

As relative references are resolved into their respective (absolute)
target URIs according to
Section 5 of [RFC3986]
, this document
does not describe that resolution. However, a fully resolved URI may
contain a non-absolute file path. For example, using a generic URI
parser, the URI:

file:alpha/bravo/charlie

might be parsed and interpreted as: file 'charlie', in directory
'bravo', in directory 'alpha', on the machine on which the URI is
being interpreted (i.e. localhost); however there is no indication of
the location of the directory 'alpha' on that machine. By convention
an absolute file path would begin with a slash ("/") character on a
Unix-based system, or a drive letter (e.g. "c:\") on a Microsoft
Windows system, etc.
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Resolution of non-absolute file paths is undefined by this
specification. A protocol that employs 'file' URIs MAY define its
own rules for resolution of relative file paths in 'file' URIs used
in the context of that protocol.
3.4
. Drive Letters
Historically drive letters have been mapped into the top of a 'file'
URI in various ways. On systems running some versions of Microsoft
Windows the drive letter may be specified with a colon (":")
character, however sometimes the colon is replaced with a pipe ("|")
character, and in some implementations the colon is omitted entirely.
The three representations MAY be considered equivalent, and any
implementation which could interact with a Microsoft Windows
environment SHOULD interpret a single letter, optionally followed by
a colon or pipe character, in the first segment of the path as a
drive letter (see the "drive-letter" rule in
Section 2.2
). For
example, the following URIs:

file:///c:/TMP/test.txt
file:///c|/TMP/test.txt
file:///c/TMP/test.txt

when interpreted on the same machine, would refer to the same file:

c:\TMP\test.txt

Implementations SHOULD use a colon (":") character to specify drive
letters when generating URIs for Microsoft DOS- and Windows-based
systems.

Note that the generic URI syntax in [
RFC3986
] dictates that "if a URI
contains an authority component [even if it's a blank authority],
then the path component must ... begin with a slash ("/") character."
However some systems running some versions of Microsoft Windows are
known to omit the slash before the drive letter, effectively
replacing the URI's authority component with the drive specification;
for example, "file://c:/TMP/test.txt". Implementations that are
likely to encounter such a URI MAY interpret it as a drive letter,
but SHOULD NOT generate such URIs.
3.5
. UNC File Paths
The Microsoft Windows Universal Naming Convention (UNC) [
MS-DTYP
defines a convention for specifying the location of resources such as
shared files or devices, for example Windows shares accessed via the
SMB/CIFS protocol [
MS-SMB2
]. The general structure of a UNC file
path, given in Augmented Backus-Naur Form (ABNF) [
RFC5234
], is:
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UNC = "\\" hostname "\" sharename *( "\" objectname )
hostname =
sharename =
objectname =

Note that this syntax description is non-normative.

There are two prevalent means of representing a UNC file path as a
'file' URI, and they differ subtly in their semantics.

The first representation of a UNC file path as a 'file' URI copies
the UNC 'hostname' into the URI 'host' field, and the UNC 'sharename'
and 'objectname's, concatenated with forward slash ("/") characters,
into the 'path'. For example, the following UNC path:

\\server.example.com\Share\path\to\file.doc

would be represented as a 'file' URI as:

file://server.example.com/Share/path/to/file.doc
\________________/\_____________________/
hostname sharename+objectnames

The implication of this representation is that, because of the
presence of a non-localhost authority, the file path is not
accessible using the regular filesystem interface from the machine on
which the URI is being interpreted. As noted in
Section 2.1
, this
doesn't necessarily preclude that the file might be accessible
through some other mechanism.

The 'file' URI scheme is unusual in that it does not specify an
Internet protocol or access method for shared files; as such, its
utility in network protocols between hosts is limited. Examples of
file server protocols that do define such access methods include SMB/
CIFS [
MS-SMB2
], NFS [
RFC3530
], and NCP [
NOVELL
].

The second representation translates the UNC file path entirely into
the 'path' segment of a 'file' URI, including both leading slashes.
For example, the UNC path given above would be represented as a
'file' URI as:

file:////server.example.com/Share/path/to/file.doc
\_________________________________________/
translated UNC path

The implication of this representation is that the full UNC path can
be accessed from the machine on which the URI is being interpreted
using its regular filesystem interface.
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3.5.1
. Historical Issues with UNC File Paths
As mentioned in
Section 3.1
, the historical definition of 'file' URIs
in [
RFC1738
] excluded the first slash ("/") character after the
protocol identifier ("file://") from the file path. As such there
exists a common variant of the second representation above, notably
used by the Firefox web browser, that includes a fifth slash between
the protocol identifier/authority and the UNC hostname. For example:

file://///server.example.com/Share/path/to/file.doc
|\_________________________________________/
| translated UNC path
extra slash

Implementations MAY interpret 'file' URIs with five slashes (three
between a blank authority and the first non-empty path segment) as a
UNC file path, but SHOULD NOT generate such URIs.
3.6
. Namespaces
The Microsoft Windows API defines Win32 Namespaces [
Win32-Namespaces
for interacting with files and devices using Windows API functions.
These namespaced paths are prefixed by "\\?\" for Win32 File
Namespaces and "\\.\" for Win32 Device Namespaces. There is also a
special case for UNC file paths [
MS-DTYP
] in Win32 File Namespaces,
referred to as "Long UNC", using the prefix "\\?\UNC\".

This specification does not define a mechanism for translating
namespaced file paths to or from 'file' URIs.
. Encoding and Character Set Considerations
As specified in [
RFC3986
], the 'file' URI scheme allows any character
from the Universal Character Set (UCS) [
ISO10646
] encoded as UTF-8
RFC3629
] and then percent-encoded in valid ASCII [
RFC20
].

If the local file system uses a known non-Unicode character encoding,
the file path SHOULD be converted to a sequence of Unicode characters
normalized according to Normalization Form C (NFC, [
UTR15
]).

Before applying any percent-encoding, an application MUST ensure the
following about the string that is used as input to the URI-
construction process:

o The host, if any, consists only of Unicode code points that
conform to the rules specified in [
RFC5892
].
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o Internationalized domain name (IDN) labels are encoded as A-labels
RFC5890
].
. Security Considerations
There are many security considerations for URI schemes discussed in
RFC3986
].

File access and the granting of privileges for specific operations
are complex topics, and the use of 'file' URIs can complicate the
security model in effect for file privileges. Software using 'file'
URIs MUST NOT grant greater access than would be available for other
file access methods.
. IANA Considerations
In accordance with the guidelines and registration procedures for new
URI schemes [
RFC4395
], this section provides the information needed
to update the registration of the 'file' URI scheme.
6.1
. URI Scheme Name
file
6.2
. Status
permanent
6.3
. URI Scheme Syntax
See
Section 2.2
of RFC XXXX. [Note to RFC Editor: please replace
XXXX with the number issued to this document.]
6.4
. URI Scheme Semantics
See
Section 2
of RFC XXXX. [Note to RFC Editor: please replace XXXX
with the number issued to this document.]
6.5
. Encoding Considerations
See
Section 4
of RFC XXXX. [Note to RFC Editor: please replace XXXX
with the number issued to this document.]
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6.6
. Applications/Protocols That Use This URI Scheme Name
Web browsers:

o Firefox

Note: Firefox has an interpretation of
RFC 1738
which affects
UNC paths. See:
Section 3.5.1
, Bugzilla#107540 [

o Chromium

o Internet Explorer

o Opera

Other applications/protocols:

o Windows API

PathCreateFromUrl function [
], MSDN

UrlCreateFromPath function [
], MSDN

o Perl LWP

These lists are non-exhaustive.
6.7
. Interoperability Considerations
Due to the convoluted history of the 'file' URI scheme there a many,
varied implementations in existence. Many have converged over time,
forming a few kernels of closely-related functionality, and RFC XXXX
attempts to accommodate such common functionality. [Note to RFC
Editor: please replace XXXX with the number issued to this document.]
However there will always be exceptions, and this fact is recognised.
6.8
. Security Considerations
See
Section 4
of RFC XXXX [Note to RFC Editor: please replace XXXX
with the number issued to this document.]
6.9
. Contact
Matthew Kerwin, matthew.kerwin@qut.edu.au
6.10
. Author/Change Controller
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This scheme is registered under the IETF tree. As such, the IETF
maintains change control.
6.11
. References
] "Bug 107540", Bugzilla@Mozilla, October 2007,
>.

] "PathCreateFromUrl function", MSDN, June 2013,
bb773581(v=vs.85).aspx>.

] "UrlCreateFromPath function", MSDN, June 2013,
bb773773(v=vs.85).aspx>
. Acknowledgements
This specification is derived from
RFC 1738
RFC1738
],
RFC 3986
RFC3986
], and I-D
draft-hoffman-file-uri
(expired)
[I-D.
draft-hoffman-file-uri
]; the acknowledgements in those documents
still apply.
. References
8.1
. Normative References
ISO10646
International Organization for Standardization,
"Information Technology - Universal Multiple-Octet Coded
Character Set (UCS)", ISO/IEC 10646:2003, December 2003.

RFC20
] Cerf, V., "ASCII format for Network Interchange",
RFC 20
October 1969.

RFC2119
] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels",
BCP 14
RFC 2119
, March 1997.

RFC3629
] Yergeau, F., "UTF-8, a transformation format of ISO
10646", STD 63,
RFC 3629
, November 2003.

RFC3986
] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC
3986
, January 2005.

RFC5234
] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68,
RFC 5234
, January 2008.
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RFC5890
] Klensin, J., "Internationalized Domain Names for
Applications (IDNA): Definitions and Document Framework",
RFC 5890
, August 2010.

RFC5892
] Faltstrom, P., "The Unicode Code Points and
Internationalized Domain Names for Applications (IDNA)",
RFC 5892
, August 2010.
RFC6874
] Carpenter, B., Cheshire, S., and R. Hinden, "Representing
IPv6 Zone Identifiers in Address Literals and Uniform
Resource Identifiers",
RFC 6874
, February 2013.

UTR15
] Davis, M. and K. Whistler, "Unicode Normalization Forms",
August 2012,
>.
8.2
. Informative References
[I-D.
draft-hoffman-file-uri
Hoffman, P., "The file URI Scheme",
draft-hoffman-file-
uri-03
(work in progress), January 2005.

IANA-URI-Schemes
Internet Assigned Numbers Authority, "Uniform Resource
Identifier (URI) Schemes registry", June 2013, <
www.iana.org/assignments/uri-schemes/uri-schemes.xml
>.

MS-DTYP
] Microsoft Open Specifications, "Windows Data Types, 2.2.56
UNC", January 2013,
>.

MS-SMB2
] Microsoft Open Specifications, "Server Message Block (SMB)
Protocol Versions 2 and 3", January 2013,
>.

NOVELL
] Novell, "NetWare Core Protocols", 2013, <
www.novell.com/developer/ndk/netware_core_protocols.html
>.

POSIX
] IEEE, "IEEE Std 1003.1, 2013 Edition", 2013,
>.

RFC1630
] Berners-Lee, T., "Universal Resource Identifiers in WWW: A
Unifying Syntax for the Expression of Names and Addresses
of Objects on the Network as used in the World-Wide Web",
RFC 1630
, June 1994.

RFC1738
] Berners-Lee, T., Masinter, L., and M. McCahill, "Uniform
Resource Locators (URL)",
RFC 1738
, December 1994.
Kerwin Expires June 14, 2014 [Page 15]
Internet-Draft 'file' URI December 2013
RFC3530
] Shepler, S., Callaghan, B., Robinson, D., Thurlow, R.,
Beame, C., Eisler, M., and D. Noveck, "Network File System
(NFS) version 4 Protocol",
RFC 3530
, April 2003.

RFC4395
] Hansen, T., Hardie, T., and L. Masinter, "Guidelines and
Registration Procedures for New URI Schemes",
BCP 35
RFC
4395
, February 2006.

WHATWG-URL
WHATWG, "URL Living Standard", May 2013,
>.

Win32-Namespaces
Microsoft Developer Network, "Naming Files, Paths, and
Namespaces", June 2013, <
library/windows/desktop/
aa365247(v=vs.85).aspx#namespaces>.

github
] Kerwin, M., "file-uri-scheme GitHub repository", n.d.,
>.

Author's Address

Matthew Kerwin
Queensland University of Technology
Victoria Park Rd
Kelvin Grove, QLD 4059
Australia

EMail: matthew.kerwin@qut.edu.au

Kerwin Expires June 14, 2014 [Page 16]
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