Re: [xsl] Error: sequence of more than one item not allowed

["Mark" <mark@xxxxxxxxxxxx>]

Hi Andrew and Michael,
Michael,
Sorry,  I normally do provide sample input and a context, but it would have 
taken a great deal of time to set up and it is just after 3 am. Luckily, 
Andrew spotted exactly what I needed.

Andrew,
Perfect! (And I would have never thought of using the grouping key, but now 
I know.)

You are right (2)'s grouping key does look odd. It is used to output a set 
of XHTML navigation buttons keyed to the "other kinds of formats available 
in <Formats>". In full, (2) looks quite strange, but it has replaced almost 
five pages of complex string parsing and testing. Ken Holman got on my case 
about my using so much C++ idiom string-parsing, so I been trying to work 
with just the nodes. My unexplained cps:functions mostly output formatted 
text for the XHMTL page.

Thanks to you both,
Mark

(2) in full:

<!-- Show related formats -->
     <xsl:choose>
       <xsl:when test="count(../../Stamp/Formats/@*[not(name(.)=$format)]) 
eq 1">
         <xsl:if test="../../Stamp/Formats/@*[not(name(.)=$format)] eq 
$item">
           <a lang="en" class="button"
             href="{concat(ancestor::Set/@year, 
'-',../../Stamp/Formats/@*[not(name(.)=$format)],cps:file-format-from-name(name(../../Stamp/Formats/@*[not(name(.)=$format)])), 
'.htm')}">
             <xsl:value-of 
select="cps:english-format-name(name(../../Stamp/Formats/@*[not(name(.)=$format)]))"/>
           </a>
           <a lang="cz" class="button"
             href="{concat(ancestor::Set/@year, '-', 
../../Stamp/Formats/@*[not(name(.)=$format)], 
cps:file-format-from-name(name(../../Stamp/Formats/@*[not(name(.)=$format)])),'.htm')}">
             <xsl:value-of 
select="cps:czech-format-name(name(../../Stamp/Formats/@*[not(name(.)=$format)]))"/>
           </a>
         </xsl:if>
       </xsl:when>
       <xsl:otherwise>
         <xsl:for-each-group select="../../Stamp/Formats" 
group-by="@*[not(name(.)=$format)]">
           <xsl:for-each select="current-group()">
             <xsl:if test="current-grouping-key() eq $item">
               <a lang="en" class="button" 
href="{concat(ancestor::Set/@year, '-', 
@*[not(name(.)=$format)],cps:file-format-from-name(name(@*[not(name(.)=$format)])), 
'.htm')}">
                 <xsl:value-of 
select="concat(cps:english-format-name(name(@*[not(name(.)=$format)])), ' 
')"/>
                 <xsl:value-of select="position()"/>
               </a>
               <a lang="cz" class="button" 
href="{concat(ancestor::Set/@year, '-',  @*[not(name(.)=$format)], 
cps:file-format-from-name(name(@*[not(name(.)=$format)])),'.htm')}">
                 <xsl:value-of select="position()"/>
                 <xsl:value-of select="concat('. ', 
cps:czech-format-name(name(@*[not(name(.)=$format)])))"/>
               </a>
             </xsl:if>
           </xsl:for-each>
         </xsl:for-each-group>
       </xsl:otherwise>
     </xsl:choose>