How do I do this?

I have a XML based message specification as follows

<message-text><param/> xxxxx yyyy <param/> zzzz bbbb <param/>
hhhh<param/></message-text>

I would like to convert it to

<file-text>{0} xxxxx yyyy {1} zzzz bbbb {2} hhhh{3}<file-text>

I need to be within the for loop of param and text(), i.e.,

<xsl:for-each select='param | text()'>

Within this for loop how do I get the param number -- position() would not
work.

Thanks,
Soumen.

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