"If the transformer spec is a keyword, the keyword bound to the
transformer spec essentially becomes an alias to the syntactic keyword
keyword. (Keyword may also be one of the core syntactic keywords like
lambda, if, define.) The same holds if the transformer spec is a macro
use that eventually expands into a (possibly empty) sequence of
multiple definitions followed by the keyword (possibly bound by the
introduced definitions)."
Could you elaborate more or give examples of the what the second
sentence implies? Is this sequence you refer to a (begin ...)
form? If so, and if it contains definitions as you suggest, what is
their scope? Can those definitions include both variable and syntax
definitions?