GdaXqlConst

#define GDA_XQL_CONST_CONST(obj)	G_TYPE_CHECK_INSTANCE_CAST((obj), gda_xql_const_get_type(), GdaXqlConst const)

GdaXqlItem* gda_xql_const_new               (void);

GdaXqlItem* gda_xql_const_new_with_data     (gchar *value,
                                             gchar *alias,
                                             gchar *type,
                                             gchar *null);