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In the interest of full disclosure, I should tell you that I have been
a Scheme user since the early 1980s.  I participated in the Scheme
standardization efforts, as a member of the group that produced the
RnRS series, and as a member of the Scheme Working Group of the
Microprocessor and Microcomputer Standards Subcommittee that produced
the IEEE Standard for the Scheme Programming Language.

Scheme was the first major Lisp dialect that combined lexical scoping,
first-class procedures, and dynamic typing.  Compilers for Scheme
demonstrated that lexically scoped dialects of Lisp can be efficiently
implemented.  I participated in many discussions on the nature of
lexical scoping.

Let me make it clear that any definition of lexical scoping taken from
a Scheme source will further my case.  In the eighties, general
agreement was found.  The Scheme reference on 


a classic example of a link that furthers my cause.