...
Line 1: A ruleset starts with the ruleset keyword, followed by the ruleset identifier or RID. In this case, the RID is hello_world. The body of a ruleset is contained with in within curly brackets.
Lines 2-10: A ruleset usually contains a meta block giving information about the ruleset. This information includes information data like the ruleset name and author, as well as pragmas that affect the ruleset's behavior. For example, this ruleset has a shares pragma saying which global functions are shared with the outside world (including other rulesets).
...
Installing a ruleset inside a pico enables the pico engine to evaluate each rule on that pico when corisponding corresponding events are raised to that pico.
...