Lines with the following general form are the basis of Middle code:
<pre>

[ @out @in ] (T1, T2, ...  Tn)

</pre>
Options start with an @ symbol.  @out and @in are used to control
the output.  If you specify neither, both input and output code 
will be created.  Specify just @in or just @out to tailor the 
output from the C++ Middleware Writer (CMW).

After any options, a list of C++ types is enclosed in a set of
parentheses.

One or more of these lines are wrapped by a name and a closing
brace -- } -- like this: 
<pre>

local_messages_front
  @out (marshalling_integer, const char*, const char*, int64_t)

  @in (bool)
  @in (std::string)
}

</pre>
<p>
Based on that input, the CMW creates a local_messages_front class 
in two files: local_messages_front.cg.hh and local_messages_front.cg.cc.

<p>


<p>
To comment out some Middle code, use // as usual.

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