A structure description is:

• A basic type:

  
  INTEGER REAL NUMBER STRING
  SYMBOL BOOLEAN ANYTHING
  

• A named structure description:

  
  (< name>  < sd> )
  

• A composite structure description:

  
  (CONS             < sd1>  < sd2> )
  (LIST             < sd1>  ... < sdn> )
  (SYMBOL (PROPLIST (< name1>  < sd1> ) ...))
  (ATOMOBJECT       (< name1>  < sd1> ) ...)
  (LISTOBJECT       (< name1>  < sd1> ) ...)
  (CRECORD < name>    (< name1>  < sd1> ) ...)
  

• A group structure description:

  
  (LISTOF  < sd> )
  (ARRAYOF < sd> )
  

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