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public interface IStyleRule {

     // Possible types of Style Rules
     static int CLASS     = 0; // Class of the object: hep.aida.IHistogram1D
     static int PATH      = 1; // Position of the object in a Tree
     static int ORDER     = 2; // Order in the IPlotterRegion: specific number, or cyclical
     static int ATTRIBUTE = 3; // Arbitrary "key=value" pair, evalyated by the Rule
                               // From AIDA object's annotation any entry with "plotterState." prefix in key
                               // will be stripped of this prefix and put into PlotterState with ATTRIBUTE
                               // type before obtaining Style from the StyleRegistry
     static int ACTION    = 4; // What is going to happen with the object: plotting, printing
     static int CATEGORY  = 5; // "experiment=GLAST", "quality=preliminary"
                               // ACTION seems like a sub-type of CATEGORY: "printing=true"

     // Operations that chain rules together
     static int OR  = 0;
     static int AND = 1;
 
     int getType();

     /**
      * Priority determines the order in which corresponding IPlotterStyle
      * should be used when assembling the cumulative IPlotterStyle
      */
      int getPriority();

     // Should have some conventions for describing Rules (XML-based ?)
     String getDescription();


     // Manage Rule Chaining

     void addRule(IStyleRule rule, int operation);

     int getNRules();

     int getRuleOperation(int n);

     IStyleRule getRule(int n);

     void removeRule(int n);


     // Evaluates the Rule, including all added Rules
     boolean ruleApplies(IPlotterState state);
}