How can i transform output stream again.

hi,

is it possible to transform my output stream again? Of course it is, but how?

xml snip:

<template name="header">   
  <img src="test.gif/>
  <br/>
</template>

<template match="img">
  <img src="@src">
     <xsl:attribute name="alt">alternativ text</xsl:attribute>
  </img>  
</template>

if your are calling this template for a header image. i would like to send 
the output stream created by template header to parse through the template 
match="img" to insert an alt text.

i gues its possible if i create a variable and apply the img template to this 
variable, but is there another way. Whats the best way do achieve this?

thanks in advance
janning

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