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  ENUM: ADType
 
   Types of Allocation Descriptors
 
  DEFINITIONS:
   
   ad_Short        Short    (see ISO 4/14.14.1)
   ad_Long         Long     (see ISO 4/14.14.2)
   ad_Extended     Extended (see ISO 4/14.14.3)
   ad_Embedded     No ADs; Embedded Data in their place
                   (see ISO 4/14.6.8 bits 0-2)
   ad_Unknown      Error condition. For internal use only.
 
  ABUSES:
   NEVER set the ADType to ad_Unknown
 
 ----------------------------------------------------------------------
enum ADType {
    ad_Short    =  0,
    ad_Long     =  1,
    ad_Extended =  2,
    ad_Embedded =  3,
    ad_Unknown  = -1
};

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