Pascal Report  ISS  6.2  Structured Types  6.1.3.  Subrange types.  The set of values determined by a subrange  type is a subset of the values of another ordinal type that is called the  host type  of the subrange type. The subrange type specifies the smallest  and the largest value, and includes every value between them.  SuhrangeType  =  Constant  ......  Constant .  Both constants must possess the host type.  The first  constant  specifies the smallest value, and must be less than or equal to the second  constant which specifies the largest value.  Examples of suhrange types:  l. .N  -10  ..  +10  Monday .. Friday  A structured type is characterized by the type(s) of its components and  by its structuring method. Moreover, a structured type may contain an  indication of the preferred data representation. If a structured type is  prefixed with the symbol  packed,  this has no effect on the meaning of a  program (with two exceptions); rather it is a hint to the compiler that  storage of values of that type should be economized even at the price of  some loss in efficiency of access, and even if this may expand the code  necessary for expressing access to components of the structure. The  two exceptions are that string types (see Section 6.2.1) are always  packed, and that an actual variable parameter (see Section 11.3) must  not be a component of a packed structured variable. If a component of a  packed  structured  type  also  possesses  a  structured  type,  the  component's type is packed only if the symbol  packed  is explicitly  given in the component's type representation.  StructuredType  = [  "packed"  1  UnpackedStructuredType  I  StructuredTypeldentifier.  UnpackedStructuredType  =  ArrayType  I  RecordType  I  SetType  I  FileType.  StructuredTypeldentiJier  =  Typeldentifier.  A structured type identifier is a type identifier that denotes a structured  type. 