efer to a file name we use <code><em>&lt;file&gt;</em></code> </p>

    <p>To refer to an integer we use <code><em>&lt;n&gt;</em></code>, for several integer values we use <code><em>[&lt;n1&gt;,&lt;n1&gt;,...]</em></code> and <code><em>&lt;val&gt;</em></code> for floating point.</p>

    <p>Finally, we use <code><em>&lt;name&gt;</em></code> for alphanumeric strings that identify field names.</p>

    </div>

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