Comma separated string parsing XSLT -

How can I loop through a comma different string which I am passing as a parameter in XSLT 1.0 ? Pre-

  & lt; Xsl: ultimate name = "uid" & gt; 1,4,7,9 & lt; / Xsl: param & gt;  

I need to loop up the UID parameter and gather nodes from each UI in my XML file