working toward example rules in the APPEL spec;
input data: forShoppers policy
@@don't grok DATASCHEMA yet@@don't grok EXTENSION yet@@NOTE: this is only a test policy@@don't grok EXTENSION yet@@don't yet grok ref attributes that don't start with #@@don't yet grok ref attributes that don't start with #@@don't grok EXTENSION yet1@@recipient: there may be more to it than this...@@don't grok EXTENSION yet