org: Using header arguments

 
 14.8.1 Using header arguments
 -----------------------------
 
 The values of header arguments can be set in several way.  When the
 header arguments in each layer have been determined, they are combined
 in order from the first, least specific (having the lowest priority) up
 to the last, most specific (having the highest priority).  A header
 argument with a higher priority replaces the same header argument
 specified at lower priority.

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