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In the EnergyPlus "Auxiliary Programs" document it says the following:

fields here will be dependent on the source

This is made a little more clear looking at the actual data specification (abbreviated):

DESIGN CONDITIONS,
  N1, \field Number of Design Conditions
  A1, \field Design Condition Source
  A2, \field Design Condition Type (HEATING)
  ...
  An, \field Design Condition Type (COOLING)

So basically it goes up to n entries and you have to know based on the source what is included, what order they are in, etc.

In the EnergyPlus "Auxiliary Programs" document it says the following:

fields here will be dependent on the source

This is made a little more clear looking at the actual data specification (abbreviated):

DESIGN CONDITIONS,
  N1, \field Number of Design Conditions
  A1, \field Design Condition Source
  A2, \field Design Condition Type (HEATING)
  ...
  An, \field Design Condition Type (COOLING)

So basically it goes up to n entries and you have to know based on the source what is included, what order they are in, etc.

In the EnergyPlus "Auxiliary Programs" document it says the following:

fields here will be dependent on the source

This is made a little more clear looking at the actual data specification (abbreviated):

DESIGN CONDITIONS,
  N1, \field Number of Design Conditions
  A1, \field Design Condition Source
  A2, \field Design Condition Type (HEATING)
  ...
  An, \field Design Condition Type (COOLING)

So basically it goes up to n entries and you have to know based on the source what is included, what order they are in, etc.

If you have an arbitrary EPW file without documentation from its source, I don't think there is a reliable way to interpret these fields ad hoc.

In the EnergyPlus "Auxiliary Programs" document it says the following:

fields here will be dependent on the source

This is made a little more clear looking at the actual data specification from the same document (abbreviated):

DESIGN CONDITIONS,
  N1, \field Number of Design Conditions
  A1, \field Design Condition Source
  A2, \field Design Condition Type (HEATING)
  ...
  An, \field Design Condition Type (COOLING)

So basically it goes up to n entries and you have to know based on the source what is included, what order they are in, etc.

If you have an arbitrary EPW file without documentation from its source, I don't think there is a reliable way to interpret these fields ad hoc.

I don't think older EnergyPlus documentation necessarily made this quite as clear. But I take the document I linked above to be current & therefore authoritative.