Josh Zeidner writes:

<dtml-in "Catalog.searchResults( MediaKeywords = ['ouch'] )"> This should work. Alternatively: "MediaKeywords = 'ouch'".

<dtml-in "Catalog.searchResults( MediaKeywords in ['ouch'] )"> This calls the catalog without any keyword arguments and with a single positional parameter 0. The catalog interprets this as "no search criteria" and returns all objects.

Dieter