https://bugzilla.wikimedia.org/show_bug.cgi?id=59973

       Web browser: ---
            Bug ID: 59973
           Summary: Pywikibot should have a
                    wikibase-error-sitelink-already-used exception
           Product: Pywikibot
           Version: core (2.0)
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Wikidata
          Assignee: [email protected]
          Reporter: [email protected]
    Classification: Unclassified
   Mobile Platform: ---

At the moment when you try to add a sitelink to an item at Wikidata that's
already used, you'll get a pywikibot.data.api.APIError. 


Sitelink to Commons Category:Mormonism based on P373
failed-save
Site link [//commons.wikimedia.org/wiki/Category:Mormonism Category:Mormonism]
is already used by item [[Q8808767]]. Perhaps the items should be
[[Help:Merge|merged]] and one of them [[Wikidata:Deletion policy|deleted]]?
Request deletion of one of the items at [[Wikidata:Requests for deletion]], or
ask at [[Wikidata:Interwiki conflicts]] if you believe that they should not be
merged.
{u'messages': {u'0': {u'type': u'error', u'name':
u'wikibase-error-sitelink-already-used', u'parameters':
[u'//commons.wikimedia.org/wiki/Category:Mormonism', u'Category:Mormonism',
u'Q8808767', u'commonswiki']}, u'html': {u'*': u'<p>Site link <a
class="external text"
href="//commons.wikimedia.org/wiki/Category:Mormonism">Category:Mormonism</a>
is already used by item <a href="/wiki/Q8808767" title="Q8808767">Q8808767</a>.
Perhaps the items should be <a href="/wiki/Help:Merge"
title="Help:Merge">merged</a> and one of them <a
href="/wiki/Wikidata:Deletion_policy" title="Wikidata:Deletion
policy">deleted</a>? Request deletion of one of the items at <a
href="/wiki/Wikidata:Requests_for_deletion" title="Wikidata:Requests for
deletion" class="mw-redirect">Wikidata:Requests for deletion</a>, or ask at <a
href="/wiki/Wikidata:Interwiki_conflicts" title="Wikidata:Interwiki
conflicts">Wikidata:Interwiki conflicts</a> if you believe that they should not
be merged.\n</p>'}}}

This is a bit too low level for me. This should be caught by either site or
page and a WikiBase exception should be thrown.

The behavior should probably be modeled after the IsRedirectPage exception. We
might want to create some more Wikibase exceptions while we're at it, but I
haven't looked into that.
PageRelatedError

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