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<h4 class="subsubsection"> 4.16.4.1 Grammar </h4>
<p><em>Written by Eric Sunshine, <a href="mailto:sunshine@sunshineco.com">sunshine@sunshineco.com</a>.</em>
</p>
<p>The syntax for the standard Crystal Space map file is specified using a
context-free grammar using a modified <small>BNF</small> (<em>Backus-Naur Form</em>)
notation.
</p>
<p><em>Terminal</em> symbols (also known as <em>tokens</em>) are denoted like this,
`<code>VERTEX</code>'. <em>Non-terminal</em> symbols are denoted in this fashion,
<em>vector</em>. Expressions enclosed within `[' and `]' are optional. When
an expression is followed by the notation `<small class="dots">...</small>', then the expression may
appear zero or more times. Finally, the symbol '|' appearing between
expressions indicates selection. Either the expression to the left may be
utilized, or the one to the right, but not both. An example follows.
</p>
<p><em>flip</em> => `<code>HEAD</code>' | `<code>TAIL</code>'<br>
<em>wager</em> => `<code>WAGER</code>' <em>flip</em>
`<code>(</code>' <em>money</em> [ `<code>,</code>' <em>money</em> <small class="dots">...</small> ] `<code>)</code>'
</p>
<p>In this example, a <samp>‘WAGER’</samp> may be followed by either <samp>‘HEAD’</samp> or
<samp>‘TAIL’</samp>, and then by a parenthesized list of monetary values separated by
commas. At least one monetary value must be specified. All subsequent values
(including the comma) are optional, as denoted by `[' and `]'. Here are a
couple of valid expressions which satisfy the <em>wager</em> production:
</p>
<table><tr><td> </td><td><pre class="example">WAGER HEAD (44)
WAGER TAIL (5, 39, 2)
</pre></td></tr></table>
<p>And here are a few invalid expressions which do not:
</p>
<table><tr><td> </td><td><pre class="example">WAGER HEAD (44,)
WAGER TAIL (,23)
WAGER TAIL ()
WAGER EITHER (81, 15)
WAGER (72, 91)
</pre></td></tr></table>
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