Last modified: 2014-02-21 11:16:38 UTC
The OpenSearch API on wikidata.org returns an empty list always. See e.g. http://www.wikidata.org/wiki/Special:ApiSandbox#action=opensearch&format=json&search=D&limit=10
Or https://www.wikidata.org/w/api.php?action=opensearch&search=Wikipedia
Technically it's working fine, it just isn't very helpful because the main namespace holds only data items with non-meaningful titles: https://www.wikidata.org/w/api.php?action=opensearch&search=Q [ "Q", [ "Q2242097", "Q658177", "Q13471093", "Q1918357", "Q2394646", "Q2311185", "Q1043760", "Q840343", "Q229548", "Q223323" ] ] You probably want to use some hooks (I *think* there are some already) to replace the OpenSearch handler's prefix searching with something more wikibase-friendly.