Last modified: 2007-04-24 07:37:32 UTC
Pages that use || in semantic searches return a blank page (0-length HTML, no content). This happened fairly recently on ontoworld.org. It makes pages like http://ontoworld.org/wiki/Help:Category (an unofficial help page) appear blank. Yet the documentation http://ontoworld.org/wiki/Help:Semantic_search#Wildcards_and_disjunctions says that || is the right way to require a disjunction. You can see it if you go to http://ontoworld.org/wiki/Special:Ask and query for [[Born in::Dallas||Iceland]] Remove one of the terms and it works.
On my local wiki, I get Catchable fatal error: Object of class Title could not be converted to string in C:\xampplite\htdocs\mediawiki\extensions\SemanticMediaWiki\includes\SMW_InlineQueries.php on line 831 $check_titles = array_diff( $titles , array() ); // Copies the array According to the doc at http://php.net/manual/en/function.array_diff, array_diff() casts to string when comparing array entries, and this fails for MediaWiki's Title objects. I think this broke in revision 17529 when normalizeRedirects() switched from working on article names to working on Title objects. Maybe there's a better way to copy the $titles array with the desired behavior. (I think array_unique() is a better function to use here and elsewhere than array_diff() but it too casts to a string.) Or, create a $check_title_article_ids array just with the title->getArticleID()s and iterate through that; but the code is complex. I think the code is also broken at line 850 if (!array_key_exists( $id , $titles)) { where it assumes a title's articleID is the key for title objects in an array. A workaround is to disable redirect normalization by setting $smwgIQRedirectNormalization = false; in the file.
I think I fixed this one for now (at least [[Born in::Dallas||Iceland]] works, and I addressed the issue with title keys). Future versions will get a better redirect handling.
