class RGL::DOT::Port

def to_s


name-label representation is returned.
Enumerable, a nested ports representation is returned; otherwise, a
Returns a string representation of this port. If ports is a non-empty 
def to_s
  if @ports.nil? || @ports.empty?
    n = (name.nil? || name.empty?) ? '' : "<#{name}>"
    n + ((n.empty? || label.nil? || label.empty?) ? '' : ' ') + label.to_s
  else
    '{' + @ports.collect { |p| p.to_s }.join(' | ') + '}'
  end
end