[xsl] XML Elements to XML Attributes

 I have a very simple question. I have currently the following xsl
script (1). But instead of creating elements I would like to create
attributes, something like:

 Where $1-4 are the values coming from the loop at position() respectively 1-4.
 Coming from a C/C++ world I would have created variables,
unfortunately I cannot do that with the loop. I must be missing
something trivial to be able to rewrite it correctly in XSL.

(1)
       <entry>
       <xsl:for-each select="td">
         <xsl:variable name="cur_val">
           <xsl:value-of select="."/>
         </xsl:variable>
         <xsl:choose>
           <xsl:when test="position() = 1">
             <tag d="{$cur_val}"/>
           </xsl:when>
           <xsl:when test="position() = 2">
             <attribute d="{$cur_val}"/>
           </xsl:when>
           <xsl:when test="position() = 3">
             <type d="{$cur_val}"/>
           </xsl:when>
           <xsl:when test="position() = 4">
             <description d="{$cur_val}"/>
           </xsl:when>
           <xsl:otherwise>
             <bug/>
           </xsl:otherwise>
         </xsl:choose>
       </xsl:for-each>
       </entry>

--
Mathieu