See "encoding.txt" for general layout info.

POLISH LAYOUT DIFFS:  Oddly Poland went with QWERTY rather than QWERTZ like Germany and Austria.
    The additions are just alternative of one of these chars + alter of cap,
    where the alt is keyed in  with AltGr
    a c e l n o s z  (this z is the dot version)
    ONLY EXCEPTION IS 2nd ALT (' version) FOR z which uses sequences AltGR+x (is no x in Polish).
      For memorizing:  The more common diacritical mark is ' and that's for the earlier
       (aphabetically) ź with earlier (alphabetically) keystroke x.
       Higher (alphabetically ) z keystroke gets the unique dot diacritical.

For iso8660-1 (latin1) encoding, need a workaround like .properties unicode escapes like these:
ẞ = \u1E9E
„ → \u201E
“ → \u201C

ą → \u0105
ć → \u0107
ę → \u0119
ł → \u0142
ń → \u0144
ó → \u00F3
ś → \u015B
ź → \u017A
ż → \u017C

Ą → \u0104
Ć → \u0106
Ę → \u0118
Ł → \u0141
Ń → \u0143
Ó → \u00D3
Ś → \u015A
Ź → \u0179
Ż → \u017B