Question on References of Online Tipitaka?

Hello,
I just need help to explain for the references of online pali text at below:
http://www.accesstoinsight.org/tipitaka/sltp/MN_I_utf8.html#pts.122

[BJT Vol M - 1] [\z M /] [\w I /]
[BJT Page 002] [\x 2/]

what is \z and \w?
what is \x?

[PTS Vol M - 1] [\z M /] [\f I /]
[PTS Page 001] [\q 1/]

what is \z? and / ?
what is \f? and / ?
what is \q?

What is \z \w \x \q \f stand for? Can you please give me a clarification when you have time? I look forward to hearing from you soon. Thanks a lot.

In Buddhist,
Ven.Chyasaro

1 Like

Thanks for the question, Iā€™d also like to know the answer!