26 #ifndef __TERRALIB_DATAACCESS_INTERNAL_FROM_H 
   27 #define __TERRALIB_DATAACCESS_INTERNAL_FROM_H 
   30 #include <boost/ptr_container/ptr_vector.hpp> 
   40     typedef boost::ptr_vector<FromItem> 
From;
 
   45 #endif  // __TERRALIB_DATAACCESS_INTERNAL_FROM_H 
An abstract class that models a source of data in a query. 
 
boost::ptr_vector< FromItem > From
It models the FROM clause for a query.