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Description: 
 A TimeMap is a
specialised form of 1-dimensional 
Mapping which can be used to represent a sequence of
conversions between standard time coordinate systems.
When a TimeMap is first created, it simply performs a unit (null) Mapping. Using the
astTimeAdd function, a series of coordinate conversion steps may then be added. This
allows multi-step conversions between a variety of time coordinate systems to be
assembled out of a set of building blocks.
For details of the individual coordinate conversions available, see the description of
the astTimeAdd function.  
Constructor Function 
 
Inheritance  
 The TimeMap class inherits from the Mapping class.  
  Attributes  
 The
TimeMap class does not define any new attributes beyond those which are applicable to
all Mappings.  
  Functions  
 In addition to those functions applicable to all Mappings,
the following function may also be applied to all TimeMaps:
                                                                                       
                                                                                       
   Copyright (C) 2021 East Asian Observatory
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 A Library for Handling
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