Description of problem:
The declare keyword is not included in content assist of the rules editor. It should be included in the list. The next step after declare keyword should be fact type, window and entry point.

The fact type should have available extends and some general pattern like "fieldName : JavaType" that the user would rewrite (this is just to give the user hint about the format).

The window declaration should offer time/length.

The entry point declaration should only put something like "entryPointName" that the user would replace.