Icarus Class: IdType
Every entry of every databank indexed in SRS is represented by an entry-ID which uniquely identifies it. Several ID types are defined (eg, entry-ID, seq-ID, 3D-ID). Only the subentry-ID is structurally different from the others.
name Attribute may stay unnamed in attribute list.
  Name of Id-type.
shareName  
size  
  Size of ID in number of bytes.
names  
  n y
  Set to 'y' when we want id names.
fipBeg
  Offset of fadd (file address within IDX file) within ID.
fipLen
  Size of fadd in bytes.
libIdBeg  
  Offset of databank-ID within ID.
libIdLen   0
  Size of databank-ID in bytes.
subNBeg  
  Offset of subentry number within ID.
subNLen   0
  Size of subentry number in bytes.
from   0
  For subentry ID's: begin of numeric range for subentry numbers
to   0
  For subentry ID's: end of numeric range for subentry numbers