In an effort to figure out how templates work on mediawiki, I copied the source from Wikipedia's "Sacramento, California" page, and then installed the "Infobox_City" template on my Wiki.

I installed ParserFunctions.php. When I look at my "Sacramento, California" page in edit mode, under the "Templates used on this page" section, here is the first template listed:

Template:!

I trace this back to the template "Infobox_City", where there are lots of operators like this:

{{!}}

... which, I am guessing, are being interpreted as template declarations.

Can someone set me on the right track on how to get my wiki to parse these {{!}} operators properly?

Thanks,

Charlie