Re: [xsl] creating multi-level TOC from existing list

Am 05.06.2020 um 01:18 schrieb Charlie0 charlieo0(_at_)comcast(_dot_)net:
> I need help with XSLT 2.0. I am completely stumped on how to proceed. I 
> have tried doing string comparisons and that is not working. I am sure 
> there is way to use grouping to accomplish what I need, but I just don't 
> know how to create two separate groups and build the TOC I need. I have 
> no code to show. Any help to put me in the right direction is appreciated.
> Below is the input, followed by the desired output. Text has been 
> distorted due company policies.
> Input snippet:
>
> <toc>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0100 VNGKNV XSSVMBLY">
>              <tocEntry filename="M2390992350401.xml" title="RVZXKR LUBV 
> CKL FKLTVR XSSVMBLY"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0100 VNGKNV XSSVMBLY">
>              <tocEntry filename="M2812292350401.xml" title="RVZLXCV 
> HYDRXULKC RVSVRVCKR BRXCKVT"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0100 VNGKNV XSSVMBLY">
>              <tocEntry filename="M3007592350401.xml"
>                  title="RVZLXCV VNGKNV FRCM SHKZZKNG/STCRXGV CCNTXKNVR"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0102 CRXNKSHXFT">
>              <tocEntry filename="M2356292350401.xml"
>                  title="RVZLXCV VKBRXTKCN DXMZVR XND CRXNKSHXFT ZULLVY"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0102 CRXNKSHXFT">
>              <tocEntry filename="M2357392350401.xml" title="RVZLXCV RVXR 
> CRXNKSHXFT SVXL"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0103 FLYWHVVL XSSVMBLY">
>              <tocEntry filename="M2357292350401.xml" title="RVZLXCV 
> FLYWHVVL"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0103 FLYWHVVL XSSVMBLY">
>              <tocEntry filename="M2390892350401.xml" title="RVZLXCV RVXR 
> CRXNKSHXFT XDXZTVR"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="03 FUVL SYSTVM">
>          <tocEntry title="0304 XKR CLVXNVR">
>              <tocEntry filename="M2142592350401.xml" title="RVZLXCV XKR 
> CLVXNVR BCCT"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="03 FUVL SYSTVM">
>          <tocEntry title="0304 XKR CLVXNVR">
>              <tocEntry filename="M2376292350401.xml"
>                  title="RVZLXCV TURBCCHXRGVR CCMZRVSSCR KNTXKV 
> ZRVSSURV/TVMZVRXTURV SVNSCR"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="03 FUVL SYSTVM">
>          <tocEntry title="0305 SUZVRCHXRGVR, BLCWVR, TURBCCHXRGVR CR 
> XLTKTUDV CCMZVNSXTCR">
>              <tocEntry filename="M2249792350401.xml" title="RVZLXCV 
> TURBCCHXRGVR "/>
>          </tocEntry>
>      </tocEntry>
> </toc>
>
> Desired output:
>
>
> <toc>
>      <tocEntry title="01 VNGKNV">
>          <tocEntry title="0100 VNGKNV XSSVMBLY">
>              <tocEntry filename="M2390992350401.xml" title="RVZXKR LUBV 
> CKL FKLTVR XSSVMBLY"/>
>          <tocEntry filename="M2812292350401.xml" title="RVZLXCV 
> HYDRXULKC RVSVRVCKR BRXCKVT"/>
>              <tocEntry filename="M3007592350401.xml"
>                  title="RVZLXCV VNGKNV FRCM SHKZZKNG/STCRXGV 
> CCNTXKNVR"/></tocEntry>
>          <tocEntry title="0102 CRXNKSHXFT">
>              <tocEntry filename="M2356292350401.xml" title="RVZLXCV 
> VKBRXTKCN DXMZVR XND CRXNKSHXFT ZULLVY"/>
>              <tocEntry filename="M2357392350401.xml" title="RVZLXCV RVXR 
> CRXNKSHXFT SVXL"/>
>          </tocEntry>
>          <tocEntry title="0103 FLYWHVVL XSSVMBLY">
>              <tocEntry filename="M2357292350401.xml" title="RVZLXCV 
> FLYWHVVL"/>
>              <tocEntry filename="M2390892350401.xml" title="RVZLXCV 
> CRXNKSHXFT XDXZTVR"/>
>          </tocEntry>
>      </tocEntry>
>      <tocEntry title="03 FUVL SYSTVM">
>          <tocEntry title="0304 XKR CLVXNVR">
>              <tocEntry filename="M2142592350401.xml" title="RVZLXCV XKR 
> CLVXNVR BCCT"/>
>              <tocEntry filename="M2376292350401.xml"
>                  title="RVZLXCV TURBCCHXRGVR CCMZRVSSCR KNTXKV 
> ZRVSSURV/TVMZVRXTURV SVNSCR"/>
>          </tocEntry>
>          <tocEntry title="0305 SUZVRCHXRGVR, BLCWVR, TURBCCHXRGVR CR 
> XLTKTUDV CCMZVNSXTCR">
>              <tocEntry filename="M2249792350401.xml" title="RVZLXCV 
> TURBCCHXRGVR "/>
>          </tocEntry>
>      </tocEntry>
> </toc>

For two levels you can just nest two for-each-group

  <xsl:template match="toc">
      <xsl:copy>
          <xsl:for-each-group select="tocEntry" group-by="@title">
              <xsl:copy>
                  <xsl:apply-templates select="@*"/>
                  <xsl:for-each-group select="current-group()/tocEntry" 
group-by="@title">
                      <xsl:copy>
                          <xsl:apply-templates select="@*, 
current-group()/tocEntry"/>
                      </xsl:copy>
                  </xsl:for-each-group>
              </xsl:copy>
          </xsl:for-each-group>
      </xsl:copy>
  </xsl:template>

for arbitrary levels you would need to morph that into a recursive 
function or template.
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