def __getitem__(self, s):
'''axis[ SlicingInfo( a,b ) ] --> a slice of the original axis
axis[ index ] --> binboundaries[index] * unit
'''
if not isSlicingInfo(s): return Dataset.__getitem__(self, s)
slicingInfo = s
indexStart, indexEnd = self.slicingInfo2IndexSlice( slicingInfo )
s = slice(indexStart, indexEnd + 1 ) #inclusive
stor = self.storage()[s]
ret = self._copy( storage = stor )
ret.__isslice = True
return ret
