url attribute is empty on
http://www.wikidata.org/w/api.php?action=wbgetitems&sites=cawiki&titles=Hirundo&props=sitelinks/urls
On testwiki the response is correct:
http://wikidata-test-repo.wikimedia.de/w/api.php?action=wbgetentities&sites=dewiki&titles=Helium&props=sitelinks/urls
Version: wmf-deployment
Severity: critical
URL: http://www.wikidata.org/w/api.php?action=wbgetitems&sites=cawiki&titles=Hirundo&props=sitelinks/urls|info
As merl says, this works as it should in latest version on test repo.
The following will produce sitelinks in the latest version
on wikidata-test-repo
<?xml version="1.0"?>
<api success="1">
<entities> <entity pageid="127194" ns="0" title="Q5786" lastrevid="169684"
modified="2012-11-26T15:55:10Z" id="q5786" type="item">
<sitelinks> <sitelink site="enwiki" title="Norway"
url="http://en.wikipedia.org/wiki/Norway" />
<sitelink site="nnwiki" title="Noreg"
url="http://nn.wikipedia.org/wiki/Noreg" />
<sitelink site="nowiki" title="Norge"
url="http://no.wikipedia.org/wiki/Norge" />
</sitelinks> </entity> </entities>
</api>