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• Has a name and a base type
• Multiple variables may use same type
• May be nested to create multidimensional variable-length types
• Access to a variable-length value is atomic
  • Length and values written or read together
  • Can't know length until value is read
  • In C/Fortran, library allocates memory for value

2008 Unidata NetCDF Workshop for Developers and Data Providers > User Defined Types in NetCDF-4

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