Dave gets the gold star and a 30 minute break from grading finals (making an assumption about current NEU activities there). So here is the test output for (what I hope is) the final version so you can see some of the other capabilities. Welcome to DrScheme, version 4.2.3 [3m]. Language: Module; memory limit: 2048 megabytes. (make-uuid-1) = #<uuid 06d644d0-ea5c-11de-b1cf-001b779c76e3> Wednesday, December 16th, 2009 8:59:44am (make-uuid-3 namespace-DNS "<a href="http://www.widgets.com">www.widgets.com</a>") = #<uuid 3d813cbb-47fb-32ba-91df-831e1593ac29> (make-uuid-3 namespace-DNS "<a href="http://www.widgets.com">www.widgets.com</a>" #:legacy #t) = #<uuid e902893a-9d22-3c7e-a7b8-d6e313b71d9f> (make-uuid-5 namespace-DNS "<a href="http://www.widgets.com">www.widgets.com</a>") = #<uuid 21f7f8de-8051-5b89-8680-0195ef798b6a> (make-uuid-5 namespace-DNS "<a href="http://www.widgets.com">www.widgets.com</a>" #:legacy #t) = #<uuid 13726f09-44a9-5eeb-8910-3525a23fb23b> (make-uuid-4) = #<uuid b27e7b45-1966-493b-947d-087f6d886dbe> U4 = #<uuid b27e7b45-1966-493b-947d-087f6d886dbe> (uuid->string U4) = "b27e7b45-1966-493b-947d-087f6d886dbe" (uuid->urn-string U4) = "urn:uuid:b27e7b45-1966-493b-947d-087f6d886dbe" namespace-DNS = #<uuid 6ba7b810-9dad-11d1-80b4-00c04fd430c8> (uuid=? U4 U4) = #t (uuid=? U4 namespace-DNS) = #f (uuid<? U4 namespace-DNS) = #f (uuid>? U4 namespace-DNS) = #t > <div class="gmail_quote"> On Wed, Dec 16, 2009 at 8:50 AM, Dave Herman <<a href="mailto:dherman@ccs.neu.edu">dherman@ccs.neu.edu</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> #:legacy ?<div><div></div><div class="h5"> Sam TH wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> On Wed, Dec 16, 2009 at 10:39 AM, Doug Williams <<a href="mailto:m.douglas.williams@gmail.com" target="_blank">m.douglas.williams@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> I thought about it. I named the boolean force? and would likely use the keyword #::force, since longer, more descriptive ones seem somewhat annoying. That would give (make-uuid-3 namespace-DNS "<a href="http://www.widgets.com" target="_blank">www.widgets.com</a>" #:force #t). How does that look? </blockquote> Hmm. What is being "forced" here? I would think something like #:rfc4122 or #:strict would be more evocative. <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> On Wed, Dec 16, 2009 at 8:31 AM, Sam TH <<a href="mailto:samth@ccs.neu.edu" target="_blank">samth@ccs.neu.edu</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> On Wed, Dec 16, 2009 at 10:24 AM, Doug Williams <<a href="mailto:m.douglas.williams@gmail.com" target="_blank">m.douglas.williams@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> ... (make-uuid-3 namespace-DNS "<a href="http://www.widgets.com" target="_blank">www.widgets.com</a>") = #<uuid 3d813cbb-47fb-32ba-91df-831e1593ac29> (make-uuid-3 namespace-DNS "<a href="http://www.widgets.com" target="_blank">www.widgets.com</a>" #t) = #<uuid e902893a-9d22-3c7e-a7b8-d6e313b71d9f> ... </blockquote> I think it would be helpful to use an optional keyword argument here, rather than just an optional boolean. -- sam th <a href="mailto:samth@ccs.neu.edu" target="_blank">samth@ccs.neu.edu</a> </blockquote> </blockquote> </blockquote> </div></div></blockquote></div>