Insert numbers after specific strings

[Ada]

I have a long xml just like this:

    <events>
        <event type="normal">

        </event>
        <event type="wait" duration="10"/>
        <event type="normal">

        </event>
        <event type="normal">

        </event>
   ....
   </events>
Now I want to insert some number attributes just like this:
    <events>
        <event num="1" type="normal"  >

        </event>
        <event num="2" type="wait" duration="10"/>
        <event type="normal">

        </event>
        <event num="3" type="normal">

        </event>
   ....
   </events>
I know VIM must can do that work,but HOW? Thanks a lot, By the way,
though I'm a newbie of VIM,but I really love it ...

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