[plt-scheme] Formlet error handling and validation?

Hi all!
I was wondering if there is any sort of Error handling/ Validation functions
built in to the Webserver/Formlets module or if there are any that someone
could provide please me with? I'm working on a project in my Special Topics
in Computer Science class in which I'm designing a website and it would be
beneficial to project to have these sorts of functions.
Thank you all in advance for any and all Help!
James G.

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James Gissendaner
Student, 12th Grade
duPont Manual High School
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