SANTIAGO, CHILE — Chile’s raspberry producers came in for some special attention during a conference for this country’s food exporters. All who were in attendance were provided with a glossy 20-page brochure just produced for raspberry farm workers. It’s one piece in a strategy to rebuild Chile’s place among raspberry exporters. Today, among the top raspberry producers are Poland, Serbia and Mexico, which supply much of the fresh market in the U.S. that Chile once dominated.