newbie question

I missed something - must be easy - but I cannot find how to achieve it:

how to get an attribute value into an attribute value?

source:

<ns:x vv="yy">text</ns:x>

desired destination

<dst value="yy">text</dst>

transformation

<xsl:template match="ns:x">
  <dst value="???????"/>"><xsl:value-of "."></dst>
</xsl:template>

What has to be typed instead of ??????? in order to refer to the value 
of the attribute vv of node ns:x?
Thanks in advance.

Rolf


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