stream-start-token()
block-mapping-start-token()
key-token()
scalar-token(plain=#t, style=#f, value="plain")
value-token()
scalar-token(plain=#t, style=#f, value="This unquoted scalar spans many lines.")
key-token()
scalar-token(plain=#t, style=#f, value="quoted")
value-token()
scalar-token(plain=#f, style=#\", value="So does this quoted scalar.\n")
block-end-token()
stream-end-token()