Re: [rules-users] Understanding "no viable alternative ..." errors

While executing the following rule, dialect "mvel" import xxx.* import java.util.* global HashMap filter rule "filter content if advertisement" when point: Point(page == "home", region ="center-content") content: Content(id=="adslot") properties["type"]=="ad" from content then filter.put(content.id, true); end I get the following error: [ERR 101] Line 16:46 no viable alternative at input 'EQUALS' in rule "filter content if advertisement" in pattern Point[18,16]: [ERR 102] Line 18:16 mismatched input '"type"' expecting ']' in rule "filter content if advertisement" in pattern properties The documentation explains that this is the most common error but I still struggle to understand the correct grammar for writing rules. Can anyone point me to a good resource (I even read the book "Drools 5" by Packt) for writing the following rule in a drl format? " If a Point has a page, "home" and region, "center-content" and the Content id is "adslot" with a property, type as "ad" then filter the Content (using a global map and passing a boolean flag) Thanks