The XDR standard defines basic and constructed data types. The XDR filter primitives are routines that define the basic and constructed data types. The XDR language provides RPC programmers with a specification for uniform representation that includes filter primitives for basic and constructed data types.

The basic data types include:

• Integers
  
• Enumeration
  
• Booleans
  
• Floating point decimals
  
• Void
  
• Constants
  
• Typedef
  
• Optional data

The constructed data types include:

• Arrays 
  Opaque data
  
  Strings
  
  Byte arrays
  
  Structures
  
  Discriminated unions
  
  Pointers

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