Embed Size (px)
Citation preview
Digital Object Identifiers
Steve Foreman, C/DRMM
WMO;WIS
2
What is a DOI? Options for providing a service How the WIS catalogue might work
Permanent identifiers for data
3
What is a DOI?
Permanent identifiers for data
4
What is a DOI?A digital object identifier (DOI) is a character string (a "digital identifier") used to uniquely identify an object such as an electronic document.
Metadata about the object is stored in association with the DOI name and this metadata may include a location, such as a URL, where the object can be found.
The DOI for a document remains fixed over the lifetime of the document, whereas its location and other metadata may change. Referring to an online document by its DOI provides more stable linking than simply referring to it by its URL, because if its URL changes, the publisher need only update the metadata for the DOI to link to the new URL.
Wikipedia
Permanent identifiers for data
http://doi.org/10.1000/182
5
Options for providing a service
Permanent identifiers for data
6
DOI servicesISO 26324
Commercial suppliers
Data publishers
Create metadata with registrar
Link metadata to data
Use DOI link to cite data
Maintain metadata
Users
Enter DOI link into browser to view metadata and possibly access data
Permanent identifiers for data
7
WIS Discovery Metadata
Data publishers
Create metadata in WIS Discovery Metadata Catalogue
Use WIS unique “FileIdentifier” to cite data
Maintain metadata
Users
Search for “FileIdentifier” in WIS catalogue to find metadata and how to access data.
WMO Manual on WIS
Permanent identifiers for data
8
Options
Permanent identifiers for data
WIS Discovery Metadata
Programme data should be published in WIS catalogue anyway
Work needed to access metadata directly
Costs already carried by data providers and GISCs
Purchase DOI service
Robust service
Assumption that service will be taken over by new provider if current provider fails
Explicit cost.
9
How the WIS catalogue might work
Permanent identifiers for data
10
WMO Example
urn:x-wmo:md:int.wmo.wis::SZCI01BABJ
GTS-bulletin:SZCI01. Tidal elevation observations available from BABJ(PEKING (BEIJING)).
http://gisc.dwd.de/SRU2JDBC/sru?operation=searchRetrieve&version=1.1&query="urn:x-wmo:md:int.wmo.wis::SZCI01BABJ"&startRecord=1&maximumRecords=10&&stylesheet=xsl/dwd-sru.xsl&x-dwd-stylesheetDetailLevel=2
http://urn.wmo.int/urn:x-wmo:md:int.wmo.wis::SZCI01BABJ
Permanent identifiers for data
11
Recording provenance of data
WIS Discovery metadata is based on ISO 19115 The WMO standard does not require all elements
of the ISO standard to be used, but permits all. “LI_Lineage” can be used to record how the
present dataset was produced Can include the file identifiers of all data sets
used in the creation of the data
Permanent identifiers for data
12
Challenges in sing the WIS catalogue
Permanent identifiers for data
Set up the shortened URL mechanism
Require GAW data to provide LI_Lineage in their datasets in a standard way
Format the search look-up responses for humans, and include more information in them.
Make the search more “intelligent” so that can distinguish between “FileIdentifiers” labelling a record, and those in the LI_Lineage
