Government URI Designfor Linked Data

W3C Government Linked Data Working Group First F2FJune 29-30, 2011

David Wooddavid@3roundstones.com

Tuesday, June 28, 2011

LOGD Instance HubURI Design

•http://logd.tw.rpi.edu/instance-hub-uri-design

•Presented by me because RPI representatives could not attend this meeting.

Tuesday, June 28, 2011

URI Design Goals

•URIs should be:•easily re-hostable.•Concise•Able to span many domains, e.g.•National identifiers (e.g. agencies, states)•State-level identifiers (e.g. counties, congressional districts)•Agency-level identifiers (e.g. EPA facilities)

Tuesday, June 28, 2011

URI Design Overview

•URI Template:

http://' BASE '/' 'id' '/' ORG '/' CATEGORY ('/' TOKEN)+

•RPI TWC’s LOGD project uses a BASE of:'logd.tw.rpi.edu'•3 Round Stones uses a BASE of:‘<agency>.3roundstones.com’

Tuesday, June 28, 2011

id

•Required to avoid “polluting” the top namespace.

•We want as short a token as possible.

•Also, consistency with data.gov.uk URIs here is a good thing.

Tuesday, June 28, 2011

ORG

•a short token representing the agency, government, or organization that controls the identifier space.

•For USG, this token will be 'us/' plus a designation of either federal or state-level (e.g. 'us/fed', 'us/ny').

•For identifiers that aren't directly governmental, the ORG token should be suitably unique; e.g. "usps-com" for USPS controlled zip code URIs.

Tuesday, June 28, 2011

CATEGORY and TOKEN

•These are ORG-specific values that identify the specific instance.

•Use as many TOKENs as necessary to distinguish the instance.

Tuesday, June 28, 2011

Example: USG Agencies

•Owner: federal

•Suggested:http://BASE/id/us/fed/agency/NAME/SUBNAME

•Example:http://BASE/id/us/fed/agency/Commerce/National_Oceanic_and_Atmospheric_Administration

Tuesday, June 28, 2011

Example: USG Agencies

•Example:

http://BASE/id/us/fed/agency/Commerce/NOAA

Tuesday, June 28, 2011

States and Territories

•Owner: federal

•Suggested:http://BASE/id/us/state/NAME

•Example:http://logd.tw.rpi.edu/id/us/state/Vermont

Tuesday, June 28, 2011

States and Territories

•States and territories are identified by FIPS 5-2 codes, two-letter abbreviations, and names.

•Not all states/territories have two-letter abbreviations.

•FIPS 5-2 has been withdrawn as a FIPS standard (2008). Names are probably the most stable.

Tuesday, June 28, 2011

EPA Facilities

•Owner: EPA

•Suggested:http://BASE/id/epa-gov/facility/ID

•Example:http://BASE/id/epa-gov/facility/110007995027

Tuesday, June 28, 2011

Persistent URLs

•PURLs may be used to hide when URIs change (ownership, hosting, control).

•Already in wide use by the Linked Open Data project (e.g. for vocabularies) and by the USG (US GPO, see http://purl.fdlp.gov).

Tuesday, June 28, 2011

Persistent URLs

•Can also be used to shorten URIs and/or make them appear in conformance to a scheme, e.g.

http://purl.fdlp.gov/GPO/LPS105923redirects to:http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19870020802_1987020802.pdf

Tuesday, June 28, 2011

THANK YOU

Tuesday, June 28, 2011

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Tuesday, June 28, 2011