value-name defined http://localhost/Languages/ocaml/man3/manual011.html#value-name
<p>
The construct <tt>as <i>value-name</i></tt> within a <a href=man3/manual017.html#class-field><i>class-field</i> binds the <i>value-name</i> for some purposes.
<p>
The construct <tt>external <i>value-name</i></tt> within a <a href= man3/manual019.html#definition><i>definition</i></a> binds the value-name to some function not defined in OCaml.
<p>
Within a <a href= man3/expr.html#let-binding><i>let-binding</i></a> (either directly or via a <i>pattern</i>) a <i>value-name</i> is bound for the scope of the <i>expr</i> of that <i>let-binding</i>.
<p>Much more work!