box a--b { #The 'instructions' value
    a->b;  #governs the indent of the
};         #a->b line inside the box here.

compress=yes,   #The 'inside' value is
  angle=2,      #used in general to set
  hscale=auto;  #indent inside an instruction

a->b: Label          #Special indent for lines
      in two lines,  #indents subsequent lines of
      or three.;     #labels to the first line.
a->b: With no special
  indent it gets the
  'inside' indent;   #..which is (2) here

a->b [arrow.type=dot,  #Special indent for attributes
      line.width=2];   #do the same for attributes.
a->b [          #If the first line is in a separate
       angle=0  #line from the aquare bracket,
     ];         #the 'attributes' value is used (2)

{
    a->b;
}              #finally, subsequent blocks
 {             #in a parallel block series
     a->b;     #get indented by the 'block'
 };            #value (=1 here).

