public RuleBase importFile(String fileName) throws IOException, ParseException {
        return importFile(fileName, null);
    }
Imports semantic rules from a file

@param fileName the rule file to use
@throws java.io.IOException if the file can not be read for some reason
@throws ParseException if the file does not contain a valid semantic rule set
container-search/src/main/java/com/yahoo/prelude/semantics/RuleImporter.java