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<a name="Velocity Specification - BNF"><strong>Velocity Specification - BNF</strong></a>
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Please note that this is currently out of date and will be updated soon.
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<td bgcolor="#ffffff"><pre>
This is a tentative BNF for Velocity, right now this is
pretty much the WM syntax. This might change, as arithmetic
might not make it into the syntax, and the future
velocity syntax will more then likely remove block
markers and instead use an &quot;#end&quot; token to signify
the end of a directive.
&lt;statement&gt;
::= &lt;text&gt;
| &lt;block&gt;
| &lt;if-statement&gt;
| &lt;else-if-statement&gt;
| &lt;foreach-statement&gt;
| &lt;include-statement&gt;
| &lt;set-statement&gt;
| &lt;parse-statement&gt;
| &lt;param-statment&gt;
| &lt;stop-statement&gt;
| &lt;reference&gt;
&lt;block&gt;
::= &quot;#begin&quot; { &lt;expresion&gt; } &quot;#end&quot;
&lt;if-statement&gt;
::= &quot;#if&quot; &quot;(&quot; &lt;expresion&gt; &quot;)&quot; &lt;statement&gt; [ &lt;else-statement&gt; ]
&lt;else-if-statement&gt;
::= &quot;#elseif&quot; &quot;(&quot; &lt;expresion&gt; &quot;)&quot; &lt;statement&gt; [ &lt;else-statement&gt; ]
&lt;foreach-statement&gt;
::= &quot;#foreach&quot; &lt;reference&gt; &quot;in&quot; &lt;reference&gt; &lt;statement&gt;
&lt;include-statement&gt;
::= &quot;#include&quot; &lt;string-literal&gt;
&lt;set-statement&gt;
::= &quot;#set&quot; &lt;reference&gt; &quot;=&quot; &lt;expression&gt;
&lt;parse-statement&gt;
::= &quot;#parse&quot; &lt;string-literal&gt;
&lt;param-statment&gt;
::= &quot;#param&quot; &lt;reference&gt; &quot;=&quot; &lt;string-literal&gt;
&lt;stop-statement&gt;
::= &quot;#stop&quot;
&lt;reference&gt;
::= &quot;$&quot; &lt;identifier&gt; { &quot;.&quot; &lt;method&gt; | &lt;identifier&gt; }
&lt;method&gt;
::= &lt;identifier&gt; &quot;(&quot; [ &lt;parameter&gt; { &quot;,&quot; &lt;parameter&gt; } ] &quot;)&quot;
&lt;parameter&gt;
::= &lt;reference&gt; | &lt;string-literal&gt;
&lt;alpha-char&gt;
::= &quot;a..z, A..Z&quot;
&lt;identifier-char&gt;
::= &quot;a..z, A..Z ,0..9 ,- ,_&quot;
&lt;identifier&gt;
::= &lt;alpha-char&gt; { &lt;identifier-char&gt; }
&lt;expression&gt;
::= &lt;true&gt;
| &lt;false&gt;
| &lt;primary-expression&gt; &quot;=&quot; &lt;assignment&gt;
| &lt;conditional-or-expression&gt;
&lt;assignment&gt;
::= &lt;primary-expression&gt; &quot;=&quot; &lt;assignment&gt;
&lt;conditional-or-expression&gt;
::= &lt;conditional-and-expression&gt; { &quot;||&quot; &lt;conditional-and-expression&gt; }
&lt;conditional-and-expression&gt;
::= &lt;equality-expression&gt; { &quot;&amp;&amp;&quot; &lt;equality-expression&gt; }
&lt;equality-expression&gt;
::= &lt;relational-expression&gt;
{ &quot;==&quot; &lt;relational-expression&gt;
| &quot;!=&quot; &lt;relational-expression&gt;
}
&lt;relational-expression&gt;
::= &lt;additive-expression&gt;
{
&quot;&lt;&quot; &lt;additive-expression&gt;
| &quot;&gt;&quot; &lt;additive-expression&gt;
| &quot;&lt;=&quot; &lt;additive-expression&gt;
| &quot;&gt;=&quot; &lt;additive-expression&gt;
}
&lt;additive-expression&gt;
::= &lt;multiplicative-expression&gt;
{
&quot;+&quot; &lt;multiplicative-expression&gt;
| &quot;-&quot; &lt;multiplicative-expression&gt;
}
&lt;multiplicative-expression&gt;
::= &lt;unary-expression&gt;
{
&quot;*&quot; &lt;unary-expression&gt;
| &quot;/&quot; &lt;unary-expression&gt;
| &quot;%&quot; &lt;unary-expression&gt;
}
&lt;unary-expression&gt;
::= &quot;!&quot; &lt;unary-expression&gt; | &lt;primary-expression&gt;
&lt;primary-expression&gt;
::= &lt;string-literal&gt;
| &lt;number-literal&gt;
| &lt;reference&gt;
| &quot;(&quot; &lt;expression&gt; &quot;)&quot;
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