In poking at the code for supporting wikivoyage, it looks to me that the site_identifiers table is populated incorrectly for non-wikipedias. For wikipedia sites, it has interwiki keys such as 'en'. For wikivoyage, it is 'enwikivoyage'. These are used to construct interwiki links and 'enwikivoyage:Berlin' is not valid. Thus it's problematic to use the sites code for interwiki links. Is there a good reason for populating the table in this way? I think the table should have si_key = 'en' for English Wikivoyage. That means a database rows for enwiki and enwikivoyage would be: 4977 | interwiki | en | 4984 | interwiki | en | ****but**** the table defines a si_type and si_key as a unique key, so this does not work currently. UNIQUE KEY `site_ids_type` (`si_type`,`si_key`), Any insights on why things are the way they are? Cheers, Katie -- Katie Filbert Wikidata Developer Wikimedia Germany e.V. | NEW: Obentrautstr. 72 | 10963 Berlin Phone (030) 219 158 26-0 http://wikimedia.de Wikimedia Germany - Society for the Promotion of free knowledge eV Entered in the register of Amtsgericht Berlin-Charlottenburg under the number 23 855 as recognized as charitable by the Inland Revenue for corporations I Berlin, tax number 27/681/51985.