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Additionally , as flower seeds , herb seed lots of 5 kg or less , ginseng seed , onion and garlic sets and tree and shrub seeds are not required to have a seed analysis certificate for import purposes , it is not required by an AI either . " Since the photograph dates from a time when President Clinton was taking steps towards establishing formal diplomatic relations between the U.S. and the Communist government of Vietnam ( a cause for which Senator Kerry and Senator John McCain were leading proponents ) , its significance to the Vietnamese is probably more that it conveys a sense of official U.S. " recognition " of the post-war Vietnamese government ( by dint of U.S. congressmen , including Senator Kerry , meeting with Communist Party officials ) . Given a class or interface A , its Use page includes subclasses of A , fields declared as A , methods that return A , and methods and constructors with parameters of type A. ( 2 ) The communication backend provides a way to integrate regular and irregular communication , e.g ., as required to deal with irregular codes . Shifts in worldview where an explanatory model meets a crisis and is replaced by an alternative may take place at different levels of development discourse as a consequence of intellectual revolutions or campaigns of citizen action .