| Wikidata property to identify libraries | Q100698536 |
| P1793 | format as a regular expression | [1-9]\d{0,5} |
| P2264 | Mix'n'match catalog ID | 993 |
| 994 | ||
| 996 | ||
| 995 | ||
| 992 | ||
| P3254 | property proposal discussion | https://www.wikidata.org/wiki/Wikidata:Property_proposal/Libraries.org_ID |
| P1896 | source website for the property | https://librarytechnology.org/libraries/ |
| P8966 | URL match pattern | ^https?:\/\/librarytechnology\.org\/library\/([1-9]\d{0,5}) |
| P9073 | applicable 'stated in' value | Libraries.org | Q64705499 |
| P1630 | formatter URL | https://librarytechnology.org/library/$1 | |
| P1552 | has characteristic | numeric identifier | Q93868746 |
| P2302 | property constraint | format constraint | Q21502404 |
| distinct-values constraint | Q21502410 | ||
| single-value constraint | Q19474404 | ||
| allowed-entity-types constraint | Q52004125 | ||
| property scope constraint | Q53869507 | ||
| subject type constraint | Q21503250 | ||
| P1659 | related property | ISIL | P791 |
| RCR number | P4645 | ||
| WorldCat Registry ID | P5505 |
| P5505 | WorldCat Registry ID | related property | P1659 |
| Q64705499 | Libraries.org | Wikidata property | P1687 |
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