[racket] Expressing attrributes in scribble/html?

Eli gave a couple of example of generating html in the as-yet undocumented,
but neat-looking #lang scribble/html on stackoverflow:
http://stackoverflow.com/questions/9253126/generate-html-in-racket

These examples are attribute free.  E.g.

#lang scribble/html@(define name "foo")@html{@head{@title{@name}}
      @body{@h1{@name}}}


How do I encode an attribute?

E.g. ? -> <a href='foo.html'>bar</a>


Thanks

Dan
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