If you have an external identifier you often can find the record you want

 Worldcat can use the lccn property

See http://worldcat.org/identities/lccn-n79005597/
That is Wikidata Q7724 that has property 
P244 lcauth 
https://m.wikidata.org/wiki/Property:P244

If you check VIAF you see The Wikidata record https://viaf.org/viaf/54154627/ and also Lccn 79005597
https://viaf.org/processed/LC%7Cn%20%2079005597

You can also use the Lccn number and find the Wikidata record
https://tools.wmflabs.org/sqid/#/view?find=P244:n79005597

Hope it make sense.... its loosely coupled system and then it maybe is not the best structure.....

Regards
Magnus Sälgö
Stockholm, Sweden

6 mars 2018 kl. 18:15 skrev Ettore RIZZA <ettorerizza@gmail.com>:

Dear all,

I asked myself a series of questions about the links between Wikidata and other knowledge/data bases, namely those of OCLC and DBpedia. For example:

- Why Wikidata has no property "Worldcat Identities" while the English edition of Wikipedia systematically mentions this identity (when it exists) in its section "Autorithy control"  ? 

- Why do VIAF links to all editions of Wikipedia, but not (simply) to Wikidata ?

- Why is there no link to DBpedia when the opposite is true ?

These questions may seem very different from each other, but they ultimately concern a common subject and are all very basic. I suspect they had to be discussed somewhere, maybe at the dawn of Wikidata. However, I find nothing in the archives of this Newsletter, nor in the discussions on Wikidata. 

Could someone point me to some documentation on these issues ? 

Cheers,

Ettore Rizza
_______________________________________________
Wikidata mailing list
Wikidata@lists.wikimedia.org
https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.wikimedia.org%2Fmailman%2Flistinfo%2Fwikidata&data=02%7C01%7C%7C24ed3d8b41df4df00fc008d58385ecec%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636559533580131494&sdata=ptVK%2Fz0vOXxJG6QDWeEaHZNhTtr6jo0VUs2Yul%2BcqfQ%3D&reserved=0