[XeTeX] word cloud or tag cloud in XeLaTeX

[Juan Francisco Fraile Vicente]

I haven't found info about this issue.
How could be word-clouds done (as web tag-clouds) in LaTeX or XeTeX?
I think they could be done managing tabular, font sizes or other options,
but my question is if there's a package to do these weighted lists of words.
There's a Javascript cloud generator that it gives the HTML Code that
perhaps is another possibility.

Thanks for your time,

J. F. Fraile
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