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The designator this describes the current note (i.e. the note currently in focus). The focus of this can vary slightly by context:

Beware of nesting changing the context. Consider the following rule:


Although the overall context is a rule, the rule contains a find, which in turn holds the 'this' designator. Therefore in the above example 'this' is evaluated in the context of the nested find() and not as in a simple $Rule.