Versions: 02
Network Working Group C. Reed
Internet-Draft OGC
Intended status: Informational February 9, 2010
Expires: July 8 2010
URN Namespace for the Defence Geospatial Information Working
Group (DGIWG)
draft-reed-urn-dgiwg-01
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Abstract
This document describes the Namespace Identifier (NID) for Uniform
Resource Namespace (URN) resources published by the Defence
Geospatial Information Working Group (DGIWG). DGIWG defines
and manages resources that utilize this URN name model.
Management activities for these and other resource types are provided
by the Defence Geospatial Information Working Group (DGIWG) Registry
System (DRS). For the processes that DGIWG uses to manage this and
other registries, see the DGIWG Concept of Operations.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. URN Specification for "dgiwg" NID . . . . . . . . . . . . . . .4
3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Namespace Considerations . . . . . . . . . . . . . . . . . . . 6
5. Community Considerations . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 7
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
8. Informative References . . . . . . . . . . . . . . . . . . . . 7
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 7
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1. Introduction
The DGIWG is a multi-national body responsible to the Defence
organizations of member nations for coordinated advice and policy
recommendations on standards and practices for geospatial information
and support services. The DGIWG creates standards and recommended
practices required to enable the provision, exchange and exploit
geospatial information. It supports the requirements of NATO and the
other alliances that its member nations participate in, including UN
sanctioned peace keeping.
The DGIWG has and continues to define standards, processes and
procedures for the use of international standards in the DGIWG
community.
The DGIWG geospatial standards are built upon the generic and
abstract standards for geographic information defined by the
International Organization for Standardization (ISO TC/211). The
DGIWG makes use of the service specifications endorsed by the Open
Geospatial Consortium (OGC).
The DGIWG defines information components for use in the development
of product specifications and application schemas for military
geospatial data. The DGIWG also establishes service specifications,
encoding formats and testing methodologies to meet military
geospatial intelligence requirements.
Some of the solutions being developed by the DGIWG need XML
namespaces that are managed so that they are unique and persistent.
To assure that the uniqueness is absolute, the registration of a
specific Namespace ID (NID) for use by the DGIWG was deemed
appropriate. Therefore, a full and complete registration will follow
the namespace specification process as defined in [RFC3406].
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2. URN Specification for "dgiwg" NID
Namespace ID: dgiwg
Registration Information:
registration version number: 1
registration date: YYYY-MM-DD [RFC Editor, please replace with
the date of publication of this RFC]
Declared registrant of the namespace:
Registering organization: Defence Geospatial Information Working
Group
Name: The Secretary (attn: Mr Paul Burton)
Address: Defence Geospatial Information Working Group (DGIWG) UK
Hydrographic Office Admiralty Way, TAUNTON Somerset
TA1 2DN
United Kingdom
Designated contact:
Role: The DGIWG Registry Services Administrator
Email: dgiwg-urn-admin@dgiwg.org
Declaration of syntactic structure:
The Namespace Specific String (NSS) of all URNs that use the
"dgiwg" NID will have the following structure:
urn:dgiwg:{DGIWGresource}:{ResourceSpecificString}
where the "DGIWGresource" is a US-ASCII string that conforms to
the URN syntax requirements [RFC2141] and defines a specific
class of resource type. Each resource type has a specific
labeling scheme that is covered by "ResourceSpecificString",
which also conforms to the naming requirements of [RFC2141].
The only exception is that the character ":" shall not be used
as part of the "DGIWGResource" string. This is to avoid possible
confusion. Further, "DGIWGResource" is case sensitive.
The DGIWG maintains a naming authority, the DGIWG Registration
System (DRS) that will manage the assignment of "DGIWGresources"
and the specific registration values assigned for each resource
class. Other DGIWG Standards documents will define the
"ResourceSpecificStrings" for a given "DGIWG resource".
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Relevant ancillary documentation:
The DGIWG defines a number of specific lists of information
elements that can be combined with the models in product
specifications and application schema. These are maintained by
the DGIWG. More information about the DRS and the registration
activities and procedures to be followed can be found in the
document "Concept of Operations for Registration", which provides
the procedures for the DGIWG registration of geographical items.
http://portal.dgiwg.org/files/?artifact_id=3526 . This is a
stable URI.
Identifier uniqueness considerations:
The DRS will manage resources using the "dgiwg" NID and will be
the authority for managing the resource type identifiers and
subsequent strings associated with them. In the associated
procedures, the DRS will ensure the uniqueness of the strings
themselves or shall permit secondary responsibility for management
of well-defined sub-trees.
The DGIWG may permit use of experimental type values that will not
be registered. As a consequence, multiple users may end up using
the same value for separate uses. As experimental usage is only
intended for testing purposes, this should not be a real issue.
Identifier persistence considerations:
The DRS will provide clear documentation of the registered uses of
the "dgiwg" NID. The DRS will establish a registry for
DGIWGresources. Each DGIWGresource will have a separate
description in the registry and may have its own sub-registry.
The registries and information will be published and maintained by
the DRS on its web site.
Process of identifier assignment:
The DRS will provide procedures for registration of each type of
Resource that it maintains. Each such resource may have three
types of registration activities:
1. Registered values associated with DGIWG specifications
or services
2. Registration of values or sub-registries to other
entities
3. Name models for use in experimental purposes
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Process for identifier resolution:
The namespace is not listed with an RDS; this is not relevant.
Rules for Lexical Equivalence:
No special considerations; the rules for lexical equivalence of
[RFC2141] apply.
Conformance with URN Syntax:
No special considerations.
Validation mechanism:
None specified. URN assignment will be handled by procedures
implemented in support of DRS activities.
Scope:
Global
3. Examples
The following examples are representative urns that could be
assigned by the DRS. They may not be the actual strings that would
be assigned.
Example 1
DGIWGresource "crs"
Syntax: "urn:dgiwg:crs:<crs name>"
ResourceSpecificString: simple string with name of the coordinate
reference system defined in a sub-registry
Use: Defines the urn to be used for queries to a DGIWG
crs registry that provides URIs for crs.
Example 2
DGIWGresource "dfdd"
Syntax: "urn:dgiwg:fad:dfdd<fad_code>:<fad_name>"
The DGIWG maintains a feature and attribute data (FAD) registry
that contains registers of geographic information concepts used to
characterize aspects of real world phenomena for different
information communities. (https://www.dgiwg.org/FAD/registers.jsp)
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urn:dgiwg:fad:dfdd:Aerodrome:aerodrome
urn:dgiwg:fad:dfdd:Helipad:helipad
urn:dgiwg:fad:dfdd:AerodromeMoveAreaLighting:aerodrome
movement area lighting
4. Namespace Considerations
The Defence Geospatial Information Working Group is developing a
variety of applications and services. Some of these services
require that supporting information (e.g., data descriptions,
attributes, etc.) be fully specified. For proper operation,
descriptions of the needed supporting information must exist and
be available in a unique, reliable, and persistent manner. These
dependencies provide the basis of need for namespaces, in one form or
another.
As the work is ongoing and the Defence Geospatial Information
Working Group covers many technical areas, the possibility of binding
to various other namespace repositories has been deemed impractical.
Each object or description, as defined by the DGIWG, could possibly
be related to multiple different other namespaces, so further
conflicts of association could occur. Thus the intent is to utilize
the Defence Geospatial Information Working Group Registration
System, operated by the DGIWG, as the naming authority for DGIWG
defined objects and descriptions.
5. Community Considerations
The objects and descriptions required for registration services
defined by the DGIWG are publicly available for use by other
organizations. The DGIWG will provide public access and support for
name requests by other organizations. This support can be enabled
in a timely and responsive fashion as new objects and descriptions
are produced. These will be enabled in a fashion similar to current
IANA processes.
6. Security Considerations
There are no additional security considerations other than those
normally associated with the use and resolution of URNs in general.
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7. IANA Considerations
This document registers with IANA a new formal URN Namespace ID,
"dgiwg", following the procedures as defined in RFC 3406 [RFC3406].
The completed registration template is in Section 2 of this document.
The affected IANA registry is currently located at:
http://www.iana.org/assignments/urn-namespaces.
8. Normative and Informative References
8.1 Normative:
[RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997.
[RFC3406] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom,
"Uniform Resource Names (URN) Namespace Definition
Mechanisms", BCP 66, RFC 3406, October 2002.
[ISO/IEC 646:1991] Information technology - ISO 7-bit coded
character set for information interchange
8.2 Informative
[DGIWG TCR-07-048] "Concept of Operations for Registration,
ConOps for Registers", March 2008.
Author's Address
Carl Reed, PhD
OGC, Inc.
2536 West Prospect
Fort Collins, CO
US
Email: creed@opengeospatial.org
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