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.