Soul Package in ConTeXt

[Steffen Wolfrum <xmailings@estfiles.de>]

Because of looking for a nice letterspacing solution I had a look at 
the LaTeX's soul.sty.

Melchior Franz wrote that it should also work with ConTeXt:

>  The soul package
>  Melchior FRANZ
>  May 29, 2002
>  Abstract
>  This article describes the soul package1, which provides h y p h e n -
>  a t a b l e l e t t e r s p a c i n g ( s p a c i n g o u t ) , 
>underlining and some
>  derivatives such as overstriking and highlighting. Although the package is
>  optimized for LATEX2", it also works with Plain TEX and with other flavors
>  of TEX like, for instance, ConTEXt.


But how?

\input soul.sty

gives me in ConTeXt:

>  (/Users/steffen/Library/texmf/tex/latex/misc/soul.sty
>  ! Undefined control sequence.
>  l.49     \NeedsTeXFormat
>                          {LaTeX2e}
>  ?


So what what did he mean by "works with"?
What is the right way?


Thank you for any reply,

Steffen