variable incrementing in XSLT -- XSLT spec

Hello ,
  We all know that XSLT does not allow incrementing a
variable after declaring it. Myself and many of us
fell that it a major handicap in writing programs
easily in XSLT. To simulate the variables we have to
use recursion and many sophisticated techniques. If
there is a feature of full scale variables in XSLT, it
would make programming really easy. I am curious why
this restriction is imposed in XSLT specification.

Regards,
Mukul

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