In general, I think it would be great to store inside Wikidata the graph of relations between identifiers. Something like:
VIAF linksTo ISNI VIAF linksTo GND … GRID linksTo ISNI arXiv linksTo DOI Last time I looked, there was no simple way to do that. So for WikiProject Universities we have used a manual approach: https://www.wikidata.org/wiki/Wikidata:WikiProject_Universities/External_databases Antonin On 08/09/2017 11:01, Magnus Manske wrote: > Is anyone working on an "auto-resolve" bot? If you have VIAF (but > nothing else), you can resolve other identifiers via the VIAF site; > similarly, if you have only GND, you could try to reverse-lookup VIAF. > > I think a list of items that have zero external identifiers, ordered by > "importance" (incoming wikidata links, number of statements etc) would > also be helpful. > > On Fri, Sep 8, 2017 at 10:52 AM Jane Darnell <[email protected] > <mailto:[email protected]>> wrote: > > As a basic rule for "which external identifiers are worth covering", > I would begin with any national identifiers we have for people > (politicians, artists, writers, theologians, scientists, etc), then > national identifiers for organizations (government-related, > GNP-related businesses, nonprofits, educational institutions, etc), > then national identifiers for places (census-defined population > centers, battle-scenes, etc) > > In my opnion, the question should not be "which identifier has the > most coverage" but "which items have the most identifiers" > > > On Thu, Sep 7, 2017 at 9:26 PM, Andrew Gray > <[email protected] <mailto:[email protected]>> wrote: > > Hi Marco, > > I guess this depends what you mean by "exhaustive". Exhaustive > in that > every Wikidata item has ID X, or exhaustive in that we have every > instance of ID X in Wikidata? > > The first is probably not going to happen, as the vast majority of > external identifiers have a defined scope for what they > identify. Some > are pretty broad - VIAF is essentially "everyone who exists in a > library catalogue as an author or subject" - but still have a limit. > We're never really going to reach a situation where there is a > single > identifier type that covers everyone, unless we're linking across to > another Wikidata-type comprehensive knowledgebase, and even then > we'd > need to ensure we're in a position where they already cover > everything > in Wikidata. > > The second can (and has) been done - the largest one I know of > offhand > for people is the Oxford DNB (60k items) but for non-people we have > complete coverage of eg Swedish district codes, P1841 (160k items). > It's a bit of a slog to get these completed and then maintained, > since > the last 5-10% tend to be more challenging complicated cases, > but one > or two determined people can make it happen. And of course it's not > appropriate for many identifiers, as they may issue IDs for things > that we don't intend to have in Wikidata, so we will never > completely > cover them. > > I should quickly plug the "expected completeness" property which is > really useful for identifiers - P2429 - as this can quickly show > whether something is a) completely on Wikidata; b) not complete yet > but eventually might be; or c) probably never will be. Not very > widely > rolled out yet, though... > > Andrew. > > > On 7 September 2017 at 19:51, Marco Fossati > <[email protected] <mailto:[email protected]>> wrote: > > Hi everyone, > > > > As a data quality addict, I've been investigating the coverage > of external > > identifiers linked to Wikidata items about people. > > > > Given the numbers on SQID [1] and some SPARQL queries [2, 3], > it seems that > > even the second most used ID (VIAF) only covers *25%* of > people items circa. > > Then, there is a long tail of IDs that are barely used at all. > > > > So here is my question: > > *which external identifiers deserve an effort to achieve > exhaustive > > coverage?* > > > > Looking forward to your valuable feedback. > > Cheers, > > > > Marco > > > > [1] https://tools.wmflabs.org/sqid/#/browse?type=properties > "Select > > datatype" set to "ExternalId", "Used for class" set to "human Q5" > > [2] total people: http://tinyurl.com/ybvcm5uw > > [3] people with a VIAF link: http://tinyurl.com/ya6dnpr7 > > > > _______________________________________________ > > Wikidata mailing list > > [email protected] <mailto:[email protected]> > > https://lists.wikimedia.org/mailman/listinfo/wikidata > > > > -- > - Andrew Gray > [email protected] <mailto:[email protected]> > > _______________________________________________ > Wikidata mailing list > [email protected] <mailto:[email protected]> > https://lists.wikimedia.org/mailman/listinfo/wikidata > > > _______________________________________________ > Wikidata mailing list > [email protected] <mailto:[email protected]> > https://lists.wikimedia.org/mailman/listinfo/wikidata > > > > _______________________________________________ > Wikidata mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikidata > _______________________________________________ Wikidata mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikidata
