integer RDF_statementsorter(
object Statement $a, object Statement $b)
     |   
     | 
		Comparison function for comparing two statements.
RDF_statementsorter() is used by the PHP function usort ( array array, callback cmp_function)
    
	
    		Parameters
    
		      
        | object Statement   | 
        $a   | 
         | 
      
		      
        | object Statement   | 
        $b   | 
         |