Give a variable as a parameter of an actionRef doesn't seem to work

[Noxalus]

<?xml version="1.0" ?>
<!DOCTYPE bulletml SYSTEM "http://www.asahi-net.or.jp/~cs8k-cyu/bulletml/bulletml.dtd">
<bulletml xmlns="http://www.asahi-net.or.jp/~cs8k-cyu/bulletml">

  <action label="top">
    <fire>
      <bulletRef label="bullet-A">
        <param>1</param>
      </bulletRef>
    </fire>
  </action>

  <bullet label="bullet-A">
    <direction type="absolute">0</direction>
    <speed>$1</speed>
    <actionRef label="A">
      <param>$1</param>
    </actionRef>
  </bullet>

  <action label="A">
    <wait>80 / $1</wait>
    <changeDirection>
      <direction type="relative">180</direction>
      <term>100 / $1</term>
    </changeDirection>
    <wait>125 / $1</wait>
    <changeDirection>
      <direction type="relative">90</direction>
      <term>0</term>
    </changeDirection>
    <wait>60 / $1</wait>
    <changeDirection>
      <direction type="relative">180</direction>
      <term>0</term>
    </changeDirection>
    <wait>60 / $1</wait>
    <changeDirection>
      <direction type="relative">90</direction>
      <term>0</term>
    </changeDirection>
    <wait>50 / $1</wait>
    <changeSpeed>
      <speed>0</speed>
      <term>0</term>
    </changeSpeed>
  </action>
</bulletml>