GEOPRIV WG M. Thomson
Internet-Draft J. Winterbottom
Expires: October 30, 2006 Andrew
April 28, 2006
Revised Civic Location Format for PIDF-LO
draft-ietf-geopriv-revised-civic-lo-02.txt
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Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document defines an XML format for the representation of civic
location. This format is designed for use with PIDF Location Object
(PIDF-LO) documents. The format is based on the civic address
definition in PIDF-LO, but adds several new elements based on the
civic types defined for DHCP, and adds a hierarchy to address complex
road identity schemes. The format also includes support for the
xml:lang language tag and restricts the types of elements where
appropriate.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Changes from PIDF-LO . . . . . . . . . . . . . . . . . . . . . 5
3.1. Additional Civic Address Types . . . . . . . . . . . . . . 5
3.2. New Thoroughfare Elements . . . . . . . . . . . . . . . . 7
3.2.1. Street Numbering . . . . . . . . . . . . . . . . . . . 8
3.2.2. Directionals and other Qualifiers . . . . . . . . . . 8
3.3. Country Element . . . . . . . . . . . . . . . . . . . . . 9
3.4. A1 Element . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5. Languages and Scripts . . . . . . . . . . . . . . . . . . 9
3.6. Whitespace . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Civic Address Schema . . . . . . . . . . . . . . . . . . . . . 11
5. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Security Considerations . . . . . . . . . . . . . . . . . . . 14
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
7.1. URN sub-namespace registration for
'urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr' . . . . 15
7.2. XML Schema Registration . . . . . . . . . . . . . . . . . 15
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8.1. Normative References . . . . . . . . . . . . . . . . . . . 16
8.2. Informative References . . . . . . . . . . . . . . . . . . 16
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
Intellectual Property and Copyright Statements . . . . . . . . . . 20
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1. Introduction
Since the publication of the original PIDF-LO civic specification, in
[I-D.ietf-geopriv-pidf-lo], it has been found that the specification
is lacking a number of additional parameters that can be used to more
precisely specify a civic location. These additional parameters have
been largely captured in [I-D.ietf-geopriv-dhcp-civil].
This document revises the GEOPRIV civic form to include the
additional civic parameters captured in [I-D.ietf-geopriv-dhcp-
civil]. The document also introduces a hierarchical structure for
thoroughfare (road) identification which is employed in some
countries. New elements are defined to allow for even more precision
in specifying a civic location.
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2. 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].
The term "thoroughfare" is used in this document to describe a road
or part of a road or other access route along which a final point is
identified. This is consistent with the definition used in [UPU-
S42].
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3. Changes from PIDF-LO
3.1. Additional Civic Address Types
[I-D.ietf-geopriv-dhcp-civil] provides a full set of parameters that
may used to describe a civic location. Specifically [I-D.ietf-
geopriv-dhcp-civil] lists several civic address types (CAtypes) that
require support in the formal PIDF-LO definition that are not in
[I-D.ietf-geopriv-pidf-lo].
These changes include and new elements that are required to support
more complex structures for naming street addresses, this is
described in more detail in Section 3.2.
+--------------+--------+-----------------------------+-------------+
| New Civic | CAtype | Description | Example |
| Field | | | |
+--------------+--------+-----------------------------+-------------+
| BLD | 24 | Building (structure) | Hope |
| | | | Theatre |
| | | | |
| UNIT | 26 | Unit (apartment, suite) | 12a |
| | | | |
| ROOM | 28 | Room | 450F |
| | | | |
| PLC | 29 | Place-type | office |
| | | | |
| POBOX | 31 | Post office box (P.O. box) | U40 |
| | | | |
| ADDCODE | 32 | Additional Code | 13203000003 |
| | | | |
| SEAT | 33 | Seat (desk, cubicle, | WS 181 |
| | | workstation) | |
| | | | |
| RD | 34 | Primary road or street | Broadway |
| | | | |
| RDSEC | 35 | Road section | 14 |
| | | | |
| RDBR | 36 | Road branch | Lane 7 |
| | | | |
| RDSUBBR | 37 | Road sub-branch | Alley 8 |
| | | | |
| PRM | 38 | Road pre-modifier | Old |
| | | | |
| POM | 39 | Road post-modifier | Extended |
+--------------+--------+-----------------------------+-------------+
Table 1: New Civic PIDF-LO Types
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Building: The "building" (BLD) conveys the name of a single building
if the street address includes more than one building or the
building name is helpful in identifying the location. (For
example, on university campuses, the house number is often not
displayed on buildings, while the building name is prominently
shown.)
Unit: The "unit" (UNIT) contains the name or number of a part of a
structure where there are separate administrative units, owners or
tenants, such as separate companies or families who occupy that
structure. Common examples include suite or apartment
designations.
Room: A "room" (ROOM) is the smallest identifiable subdivision of a
structure.
Place type: The "type of place" element (PLC) describes the type of
place described by the civic coordinates. For example, it
describes whether it is a home, office, street or other public
space. The values are drawn from the items in the location types
registry [I-D.ietf-geopriv-location-types-registry]. This
information makes it easy, for example, for the DHCP client to
then populate the presence information.
Post office box: The "post office box" element (POBOX) describes a
container, such as a pigeon hole, at a central mailing location,
where mail is held.
Additional code: The "additional code" item (ADDCODE) provides an
additional, country-specific code identifying the location. For
example, for Japan, it contains the Japan Industry Standard (JIS)
address code. The JIS address code provides a unique address
inside of Japan, down to the level of indicating the floor of the
building.
Seat: The "seat" element (SEAT) describes a single place where a
person might sit. Common examples include a seat in a theatre and
a cubicle in a cube farm.
Primary Road Name: The "primary road name" item (RD) is the name
given to the root road or street associated with the address. In
many cases this will the name of the road or street on which an
office or house exists, in some cases it will be the name of road
or street from which more granular information stems. In most
countries, this field should be used in preference to the "A6"
element, which was previously used for street information.
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Road Section: The "road section" item (RDSEC) is an identifier that
represents a specific section or stretch of a primary road. This
is a new thoroughfare element and is useful where a primary road
reuses street numbering, or branch street names and there is no
other way to identify that this has occurred, such as a change in
municipality or suburb.
Branch Road Name: The "branch road name" item (RDBR) represents the
name or identifier of a road/street that intersects or is
associated with a primary road. The road branch is a new
thoroughfare element and is envisaged being used where branch
roads along a primary road reuse names and there is no other way,
other than the road section (RDSEC) identifier, to discern a
difference between them, such as a change in municipality or
suburb.
Sub-Branch Road Name: The "sub-branch road name" item (RDSUBBR)
represents the name or identifier of a road/street that intersects
or is associated with a branch road (RDBR). The road sub-branch
is a new thoroughfare element and is envisaged being used where
sub-branch roads reuse names and there is no way, other than the
road section (RDSEC) identifier, to discern a difference between
them, such as a change in municipality or suburb.
Road Pre-Modifier: The "road pre-modifier" item (PRM) is an optional
element of the complete street name. It is a word or phrase that
precedes all other elements of the street name and modifies it,
but is separated from the street name by a street name pre-
directional. An example is "Old" in "Old North First Street".
Road Post-Modifier: The "road post-modifier" item (POM) is an
optional element of the complete street name. It is a word or
phrase that follows all other elements of the street name and
modifies it, but is separated from the street name by a street
name post-directional and/or street suffix. An example is
"Extended" in "East End Avenue Extended".
3.2. New Thoroughfare Elements
In some countries a thoroughfare can be broken up into sections, and
it is not uncommon for street numbers to be repeated between
sections. A road section identifier is required to ensure that an
address is unique. For example, "West Alice Parade" has 5 sections,
each numbered from 1; unless the section is specified "7 West Alice
Parade" could exist in 5 different places. The "RDSEC" element is
used to specify the section.
Minor streets can share the same name, so that they can only be
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distinguished by the major thoroughfare with which they intersect.
For example, both "West Alice Parade, Section 3" and "Bob Street"
could both be interested by a "Carol Lane". The "RDBR" element is
used to specify a road branch where the name of the branch does not
uniquely identify the road. Road branches MAY also be used where a
major thoroughfare is split into sections.
Similar to the way that a road branch is associated with a road, a
road sub-branch is associated with a road branch. The "RDSUBBR"
element is used to identify road sub-branches.
The "A6" element is retained for use in those countries that require
this level of detail. Where "A6" was previously used for street
names, it MUST NOT be used, the "RD" element MUST be used for
thoroughfare data.
The following example figure shows a fictional arrangement of roads
where these new thoroughfare elements are applicable.
| ||
| ---------------||
| Carol La. Carol La. || Bob
| || St.
| West Alice Pde. ||
==========/=================/===============/==========||===========
Sec.1 Sec.2 Sec.3 | Sec.4 || Sec.5
| ||
----------| Carol ||
Alley 2 | La. ||
| ||
3.2.1. Street Numbering
The introduction of new thoroughfare elements affects the
interpretation of several of more specific civic address data. In
particular, street numbering (the "HNO" element) applies to the most
specific road element specified. That is, the first specified
element from: "RDSUBBR", "RDBR", "RDSEC", or "RD".
3.2.2. Directionals and other Qualifiers
The "PRM", "POM", "PRD", "POD" and "STS" elements always apply to the
value of the "RD" element only. If road branches or sub-branches
require street suffixes or qualifiers, they MUST be included in the
"RDBR" or "RDSUBBR" element text.
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3.3. Country Element
The "country" element differs from that defined in [I-D.ietf-geopriv-
pidf-lo] in that it now restricts the value space of the element to
two upper case characters, which correspond to the alpha-2 codes in
[ISO.3166-1].
3.4. A1 Element
The "A1" element is used for the top level subdivision within a
country. In the absence of a country-specific guide on how to use
the A-series of elements, the second part of the ISO 3166-2 code
[ISO.3166-2] for a country subdivision SHOULD be used. The ISO
3166-2 code is a formed of a country code and hyphen plus a code of
one, two or three characters or numerals. For the "A1" element, the
leading country code and hyphen are omitted and only the subdivision
code is included.
For example, the codes for Canada include CA-BC, CA-ON, CA-QC;
Luxembourg has just three single character codes: LU-D, LU-G and
LU-L; Australia uses both two and three character codes: AU-ACT, AU-
NSW, AU-NT; France uses numerical codes for mainland France and
letters for territories: FR-75, FR-NC. This results in the following
fragments:
<country>CA</country><A1>ON</A1>
<country>LU</country><A1>L</A1>
<country>AU</country><A1>ACT</A1>
<country>FR</country><A1>75</A1>
3.5. Languages and Scripts
The XML schema defined for civic addresses allows for the addition of
the "xml:lang" attribute to all elements except "country" and "PLC",
which both contain enumerated values.
The "script" field defined in [I-D.ietf-geopriv-dhcp-civil] is
omitted in favour of using the "xml:lang" attribute.
It is RECOMMENDED that each "civicAddress" element use one language
only, or a combination of languages that is consistent. Where a
civic location is represented in multiple languages multiple
"civicAddress" elements SHOULD be included in the PIDF-LO document.
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3.6. Whitespace
The XML schema [W3C.REC-xmlschema-2-20041028] defined in Section 4
uses a base type of "token" instead of "string" as used in [I-D.ietf-
geopriv-pidf-lo].
The "token" type ensures that whitespace within instance documents is
normalized and collapsed before being passed to a processor. This
ensures that the following fragments are considered equivalent by XML
processors:
<A4>North Wollongong</A4>
<A1>North
Wollongong</A1>
<A1>
North Wollongong
</A1>
Whitespace may still be included in values by using character
references, such as " ".
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4. Civic Address Schema
<?xml version="1.0"?>
<xs:schema
targetNamespace="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:ca="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/xml.xsd"/>
<xs:simpleType name="iso3166a2">
<xs:restriction base="xs:token">
<xs:pattern value="[A-Z]{2}"/>
</xs:restriction>
</xs:simpleType>
<xs:complexType name="caType">
<xs:simpleContent>
<xs:extension base="xs:token">
<xs:attribute ref="xml:lang" use="optional"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:element name="civicAddress" type="ca:civicAddress"/>
<xs:complexType name="civicAddress">
<xs:sequence>
<xs:element name="country" type="ca:iso3166a2" minOccurs="0"/>
<xs:element name="A1" type="ca:caType" minOccurs="0"/>
<xs:element name="A2" type="ca:caType" minOccurs="0"/>
<xs:element name="A3" type="ca:caType" minOccurs="0"/>
<xs:element name="A4" type="ca:caType" minOccurs="0"/>
<xs:element name="A5" type="ca:caType" minOccurs="0"/>
<xs:element name="A6" type="ca:caType" minOccurs="0"/>
<xs:element name="PRM" type="ca:caType" minOccurs="0"/>
<xs:element name="PRD" type="ca:caType" minOccurs="0"/>
<xs:element name="RD" type="ca:caType" minOccurs="0"/>
<xs:element name="STS" type="ca:caType" minOccurs="0"/>
<xs:element name="POD" type="ca:caType" minOccurs="0"/>
<xs:element name="POM" type="ca:caType" minOccurs="0"/>
<xs:element name="RDSEC" type="ca:caType" minOccurs="0"/>
<xs:element name="RDBR" type="ca:caType" minOccurs="0"/>
<xs:element name="RDSUBBR" type="ca:caType" minOccurs="0"/>
<xs:element name="HNO" type="ca:caType" minOccurs="0"/>
<xs:element name="HNS" type="ca:caType" minOccurs="0"/>
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<xs:element name="LMK" type="ca:caType" minOccurs="0"/>
<xs:element name="LOC" type="ca:caType" minOccurs="0"/>
<xs:element name="FLR" type="ca:caType" minOccurs="0"/>
<xs:element name="NAM" type="ca:caType" minOccurs="0"/>
<xs:element name="PC" type="ca:caType" minOccurs="0"/>
<xs:element name="BLD" type="ca:caType" minOccurs="0"/>
<xs:element name="UNIT" type="ca:caType" minOccurs="0"/>
<xs:element name="ROOM" type="ca:caType" minOccurs="0"/>
<xs:element name="SEAT" type="ca:caType" minOccurs="0"/>
<xs:element name="PLC" type="xs:token" minOccurs="0"/>
<xs:element name="POBOX" type="ca:caType" minOccurs="0"/>
<xs:element name="ADDCODE" type="ca:caType" minOccurs="0"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="xml:lang" use="optional"/>
</xs:complexType>
</xs:schema>
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5. Example
<?xml version="1.0"?>
<civicAddress xml:lang="en-AU"
xmlns="urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr">
<country>AU</country>
<A1>NSW</A1>
<A3> Wollongong
</A3><A4>North Wollongong
</A4>
<RD>Flinders</RD><STS>Street</STS>
<RDBR>Campbell Street</RDBR>
<LMK>
Gilligan's Island
</LMK> <LOC>Corner</LOC>
<NAM> Video Rental Store </NAM>
<PC>2500</PC>
<ROOM> Westerns and Classics </ROOM>
<PLC>store</PLC>
<POBOX>Private Box 15</POBOX>
</civicAddress>
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6. Security Considerations
The XML representation described in this document is designed for
inclusion in a PIDF-LO document. As such, it is subject to the same
security considerations as are described in
[I-D.ietf-geopriv-pidf-lo]. Considerations relating to the inclusion
of this representation in other XML documents are outside the scope
of this document.
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7. IANA Considerations
7.1. URN sub-namespace registration for
'urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr'
This document calls for IANA to register a new XML namespace, as per
the guidelines in [RFC3688].
URI: urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr
Registrant Contact: IETF, GEOPRIV working group (geopriv@ietf.org),
Martin Thomson (martin.thomson@andrew.com).
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>GEOPRIV Civic Address</title>
</head>
<body>
<h1>Format for Distributing Civic Address in GEOPRIV</h1>
<h2>urn:ietf:params:xml:ns:pidf:geopriv10:civicAddr</h2>
[[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
with the RFC number for this specification.]]
<p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
</body>
</html>
END
7.2. XML Schema Registration
This section registers an XML schema as per the procedures in
[RFC3688].
URI: urn:ietf:params:xml:schema:pidf:geopriv10:civicAddr
Registrant Contact: IETF, GEOPRIV working group, (geopriv@ietf.org),
Martin Thomson (martin.thomson@andrew.com).
The XML for this schema can be found as the entirety of Section 4
of this document.
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8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[W3C.REC-xmlschema-2-20041028]
Malhotra, A. and P. Biron, "XML Schema Part 2: Datatypes
Second Edition", W3C REC REC-xmlschema-2-20041028,
October 2004.
[I-D.ietf-geopriv-dhcp-civil]
Schulzrinne, H., "Dynamic Host Configuration Protocol
(DHCPv4 and DHCPv6) Option for Civic Addresses
Configuration Information",
draft-ietf-geopriv-dhcp-civil-09 (work in progress),
January 2006.
[I-D.ietf-geopriv-location-types-registry]
Schulzrinne, H. and H. Tschofenig, "Location Types
Registry", draft-ietf-geopriv-location-types-registry-05
(work in progress), March 2006.
[ISO.3166-1]
International Organization for Standardization, "Codes for
the representation of names of countries and their
subdivisions - Part 1: Country codes", ISO Standard 3166-
1:1997, 1997,
<http://www.iso.org/iso/en/prods-services/iso3166ma/>.
[ISO.3166-2]
International Organization for Standardization, "Codes for
the representation of names of countries and their
subdivisions - Part 2: Country subdivision code",
ISO Standard 3166-2:1998, 1998,
<http://www.iso.org/iso/en/prods-services/iso3166ma/>.
8.2. Informative References
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
[I-D.ietf-geopriv-pidf-lo]
Peterson, J., "A Presence-based GEOPRIV Location Object
Format", draft-ietf-geopriv-pidf-lo-03 (work in progress),
September 2004.
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[UPU-S42] Universal Postal Union (UPU), "International Postal
Address Components and Templates", UPS SB42-4, July 2004.
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Appendix A. Acknowledgements
The authors would like to thank Henning Schulzrinne for his
assistance in defining the additional civic address types,
particularly his research into different addressing schemes that lead
to the introduction of the thoroughfare elements. Rohan Mahy
suggested the ISO 3166-2 recommendation for A1. In addition we would
like to thank Jon Peterson for his work in defining the PIDF-LO.
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Authors' Addresses
Martin Thomson
Andrew
PO Box U40
Wollongong University Campus, NSW 2500
AU
Phone: +61 2 4221 2915
Email: martin.thomson@andrew.com
URI: http://www.andrew.com/
James Winterbottom
Andrew
PO Box U40
Wollongong University Campus, NSW 2500
AU
Phone: +61 2 4221 2938
Email: james.winterbottom@andrew.com
URI: http://www.andrew.com/
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Acknowledgment
Funding for the RFC Editor function is currently provided by the
Internet Society.
Thomson & Winterbottom Expires October 30, 2006 [Page 20]
