code: private static int getPredefinedRelation_(String scl, int dim_a, int dim_b) {
  		if (equals_(scl))
  			return RelationalOperations.Relation.equals;
  
  		if (disjoint_(scl))
  			return RelationalOperations.Relation.disjoint;
  
  		if (touches_(scl, dim_a, dim_b))
  			return RelationalOperations.Relation.touches;
  
  		if (crosses_(scl, dim_a, dim_b))
  			return RelationalOperations.Relation.crosses;
  
  		if (contains_(scl))
  			return RelationalOperations.Relation.contains;
  
  		if (overlaps_(scl, dim_a, dim_b))
  			return RelationalOperations.Relation.overlaps;
  
  		return RelationalOperations.Relation.unknown;
  	}
docs: Checks whether scl string is a predefined relation.