A NormMap is a Mapping which normalises coordinate values using the astNorm function of the supplied Frame. The number of inputs and outputs of a NormMap are both equal to the number of axes in the supplied Frame.
The forward and inverse transformation of a NormMap are both defined but are identical (that is, they do not form a real inverse pair in that the inverse transformation does not undo the normalisation, instead it reapplies it). However, the astSimplify function will replace neighbouring pairs of forward and inverse NormMaps by a single UnitMap (so long as the Frames encapsulated by the two NormMaps are equal - i.e. have the same class and the same attribute values). This means, for instance, that if a CmpMap contains a NormMap, the CmpMap will still cancel with its own inverse.
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A null Object pointer (AST__NULL) will be returned if this function is invoked with the AST error status set, or if it should fail for any reason.