strict digraph graph0 {

  // test continuation lines (ending in \)
  berlin [ label="Berlin\
  Ost" ]

  bonn [ label="Bonn\
  am\
  Rhein" ]

  // test double quoted string continuation "foo" + "bar" in attributes
  bonn -> berlin [ label="train" + " (ICE)" ]

  // and nodes
  "bonn" + "test" [ label="Bonn" + " (Rhei \
   n)" ]

  // test more than one concat, more than one space plus empty parts
  "Cottbus" [ label= "Cot"  + "" + "tb" +"" +"" +  "us" ]

  "bonntest" -> "Cottbus"
}