Page Comparison

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ruleset hello_world {
  meta {
    name "Hello World"
    description <<
A first ruleset for the Quickstart
>>
    author "Phil Windley"
    logging on
    shares hello
  }
   
  global {
    hello = function(obj) {
      msg = "Hello " + obj;
      msg
    }
  }
   
  rule hello_world {
    select when echo hello
    send_directive("say", {"something": "Hello World"})
  }
   
}

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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 within the curly brackets opening at line 1 and closing at line 24. By convention, this ruleset will be stored in a file named hello_world.krl (the RID followed by a .krl file extension).

Lines 2-109: A ruleset usually contains a meta block giving information about the ruleset. This information includes 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. 

Lines 1211-1716: A ruleset usually contains a global block which globally binds values to names, some of which may be shared. In this case, the name hello is bound to a function value and is shared.

Lines 1918-2221: A ruleset usually contains one or more rules. In this case there is one rule named hello_world which will be watching for events with domain echo and name, or type, hello.

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