<extend file="Base/common" />
<block name="body">
BODY
{$num}
<assign name="b" value="1" />
<raw>
<volist name="b" id="vo">
<if condition="$a == 1">
{$a}
<else condition="$a == 2" />
{$b}
</if>
</volist>
</raw>
<include file="Base/a" />
</block>