text: #ifndef FILEPOSITIONSTART_H
  #define FILEPOSITIONSTART_H
  
  #include "DataExtractor.h"
  #include "ConcreteTableColumn.h"
  
  class FilePositionStart : public DataExtractor {
  
  public:
  
  	FilePositionStart(DataExtractor *next, ConcreteTableColumn *prototype, TriggerCondition *condition);
  
  protected:
  
      virtual TableColumn* handleExtraction(AbstractTree &tree);
  
  };
  #endif //FILEPOSITIONSTART_H