anchor.diff:  	: ( '+' | '-' )? arithmetic_primary;
   
   arithmetic_primary
  -	: state_field_path_expression
  +	: state_field_path_expr
   	| numeric_literal
   	| LPAREN simple_arithmetic_expr RPAREN
   	| functions_returning_numerics
  
positive.code: like_expr
  	: string_expr keyNOT? 'LIKE' pattern_value=string_literal ('ESCAPE' escape_character=string_literal)?;
  
  null_comparison_expression
  	: single_valued_path_expression 'IS' (keyNOT)? 'NULL';
  
  empty_collection_comparison_expression
  	: collection_valued_path_expression 'IS' (keyNOT)? 'EMPTY';
  
  collection_member_expr
  
negative.code: 	;
  
  string_primary
  	: state_field_path_expr
  	| string_literal
  	| functions_returning_strings
  	;
  
  datetime_expr
  	: datetime_primary
  	;
  
  datetime_primary
  	: state_field_path_expr
  	| functions_returning_datetime
  	;
  
  boolean_expr
  	: boolean_primary
  	;
  
  boolean_primary
  	: state_field_path_expr
  	| boolean_literal
  	;
  
  