          1         2         3         4         5         6         7         8         9       9
 1 345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
 2                                                                                                |
 3 packet with bytes attribute < length of header + trailer                                       |
 4 +++hB <?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d' bytes='5'?>      <?xpacket end='r'?>---tB
 5                                                                                                |
 6 packet with bytes attribute = length of header + trailer (valid packet)                        |
 8 +++hG<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d' bytes='86'?>      <?xpacket end='r'?>---tG
 9                                                                                                |
10 packet with valid bytes attribute but not enough padding                                       |
11 +++hB <?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d" bytes="400"?>         <?xpacket end='r'?>
                                                                                                   
                                                                                                   
         ---pB                                                                                     
                                                                                                   
                                                                                                   
                                                                                                  |
18        1         2         3         4         5         6         7         8         9       9
19 345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
