XWiki
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Had seen it before, but not looked closely. In a session with Ludovic Dubost demoing it now. Probably the closest thing to Wagn that i've seen, but the structure is within cards - i.e. in our lingo it's like complex cardtypes (whose scripts are editable in the GUI!), rather than building such complexity by relating cards together.
--John Abbe.....Sat May 10 20:14:13 +0000 2008
complex cardtypes often controlled by code. don't remember if there's a query language.
--John Abbe.....Mon Oct 20 04:19:45 -0700 2008
Two query languages are available in XWiki : direct HQL and XWiki query language
--jvelo (Not signed in).....Fri Jun 12 13:30:02 -0700 2009
"WQL, the first wiki query language, lets you find and organize cards using plusses and other relationships.". I doubt it's the first one since XWiki has had a query language since 2004 ;) We've used HQL since the beginning (see http://platform.xwiki.org/xwiki/bin/view/DevGuide/velocityHqlExamples for some examples). We've more recently introduced another query language: XWQL which is a superset of JPQL (see http://dev.xwiki.org/xwiki/bin/view/Design/XWiki+Query+Language+Specification)
--Vincent (Not signed in).....Fri Jun 12 23:49:54 -0700 2009
Vincent, you're definitely right. We were wrong about that when we wrote it (which was well over a year ago now), and I'd thought we'd gotten rid of that on the site; I just did some searches and took it out where I could.
Our bad. No intent to disrespect XWiki or its many innovations.
--Ethan McCutchen.....Sat Jun 13 09:52:36 -0700 2009