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 A Library for Handling
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Description: 
 This function
clears the values of a specified set of attributes for an 
Object. Clearing an
attribute cancels any value that has previously been explicitly set for it, so that
the standard default attribute value will subsequently be used instead. This
also causes the 
astTest function to return the value zero for the attribute,
indicating that no value has been set.  
Synopsis 
 void astClear( AstObject
this, const
char attrib
)  
 Parameters: 
  this  
 Pointer to the Object.  
  attrib  
 Pointer to a null-terminated
character string containing a comma-separated list of the names of the attributes to be
cleared.  
    Applicability 
  Object  
 This function applies to all Objects.  
    Notes: 
- 
Attribute names are not case sensitive and may be surrounded by white space.
 
- 
It does no harm to clear an attribute whose value has not been set.
 
- 
                                                                                       
                                                                                       
An error will result if an attempt is made to clear the value of a read-only attribute.
 
  Copyright (C) 2021 East Asian Observatory
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 A Library for Handling
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Coordinate Systems
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