[xsl] Can a single XPath statement duplicate the functionality of this verbose <xsl:choose> statement?

["Mark" <mark@xxxxxxxxxxxx>]

Although they do have the virtue of giving me my desired output, can the 
following sequence of statements be replaced by a more generalized (shorter 
and simpler) XPath statement without the repetitive "when" tests shown 
below?

<xsl:choose>
         <xsl:when test="@souvenir-sheet">
           <xsl:copy-of select="if (../Location/@souvenir-sheet) then 
../Location/@souvenir-sheet else if (../Location/@denomination) then 
../Location/@denomination else '0' "/>
         </xsl:when>
         <xsl:when test="@minisheet">
           <xsl:copy-of select="if(../Location/@minisheet) then 
../Location/@minisheet else if(../Location/@denomination) then 
../Location/@denomination else '0'"/>
         </xsl:when>
         <xsl:when test="@booklet">
           <xsl:copy-of select="if(../Location/@booklet) then 
../Location/@booklet else if(../Location/@denomination) then 
../Location/@denomination else '0'"/>
         </xsl:when>
         <xsl:when test="@se-tenant">
           <xsl:copy-of select="if (../Location/@se-tenant) then 
../Location/@se-tenant else if(../Location/@denomination) then 
../Location/@denomination else '0'"/>
         </xsl:when>
         <xsl:when test="@coupon">
           <xsl:copy-of select=" if (../Location/@coupon) then 
../Location/@coupon else if(../Location/@denomination) then 
../Location/@denomination else '0'"/>
         </xsl:when>
</xsl:choose>

My XPath is very weak.

I tried:
<xsl:copy-of select="if (../Location[name(@*)=name(@*)]) then 
../Location/@*  else if(../Location/@denomination) then 
../Location/@denomination else '0'"></xsl:copy-of>

but it does not restrict the first "then" to returning the value of only 
locations with an attribute of the same name (as shown in the series of 
<when> statements).

The current context is a <Formats> element with a single attribute 
(@minisheet, etc.). <Location> elements, if they exist, have a one-to-one 
relationship with respect to their attribute with their sibling <Formats> 
elements, i.e, a <Formats @minisheet> element is paired with exactly one 
<Location @minisheet> sibling, or with no <Location> element at all. In that 
case substitute value of the single <Locations @denomination> element if it 
exists, or provide a value of '0' if it does not.

If there is not enough info here to correct my faulty try at a simpler XPath 
statement or to tell me its not going to work no matter what, then I can 
provide a brief input and desired output selection.

Thanks,
Mark