Need Python advocacy link or document ASAP :)

[Jim Hefferon]

"GerritM" <gmuller at worldonline.nl> wrote
> The TIOBE Programming Community index gives an indication of the popularity
> of programming languages. It is updated once a month. The ratings are based
>  ...
Please, can you explain briefly:
  1) roughly how is it computed (else this technical community of readers
    will be dubious)?
  2) why XML is listed as a programming language?  

Thanks,
Jim