Re: [xsl] Can't solve the following XSL transformation

[John Robb <john_ok@xxxxxx>]

But how is it possible to determine,if the following Subsector can be 
shown on this page or on the following.The problem is how to output 
page-breaks exactly before sector/subsector only and no more than 25 
elements per pag.

Mon, 25 Jul 2005 07:31:26 +0100, "Michael Kay" <mike@xxxxxxxxxxxx> 
ohq`k(`):

> Here's a simplified form of the problem. Given this input:
>
> <chap>
>  <para lines="3"/>
>  <para lines="5"/>
>  <para lines="8"/>
>  etc
> </chap>
>
> produce a copy of the input, with a <page-break/> element inserted 
> after any
> para that causes the cumulative number of lines to exceed 30.
>
> The answer to this is what I call "sibling recursion", something 
> like this:
>
> <xsl:template match="chap">
> <xsl:copy>
>  <xsl:apply-templates select="para[1]"/>
> </xsl:copy>
> </xsl:template>
>
> <xsl:template match="para">
>  <xsl:param name="lines-so-far" select="0"/>  <!-- 0 is the default 
> value
> of the parameter -->
>  <xsl:copy-of select="."/>
>  <xsl:choose>
>  <xsl:when test="$lines-so-far + @lines <= 30">
>    <xsl:apply-templates select="following-sibling::para[1]">
>       <xsl:with-param name="lines-so-far" select="$lines-so-far + 
> @lines"/>
>    </xsl:apply-templates>
>  </xsl:when>
>  <xsl:otherwise>
>    <page-break/>
>    <xsl:apply-templates select="following-sibling::para[1]"/>
>  </xsl:otherwise>
>  </xsl:choose>
> </xsl:template>
>
> Sibling recursion using xsl:apply-templates has a couple of 
> advantages over
> call-template recursion: the sequence over which you are iterating 
> is an
> implicit parameter (it's identified implicitly by the context node); 
> and the
> recursion terminates naturally when there are no more siblings.
>
> Michael Kay
> http://www.saxonica.com/
>
>
> > -----Original Message-----
> > From: John Robb [mailto:john_ok@xxxxxx] 
> > Sent: 25 July 2005 06:22
> > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > Subject: Re: [xsl] Can't solve the following XSL transformation
> >
> > I'm a novice in XSLT and it's not very easy for me to realize the 
> > second part of the algorithm.Can you please give me a short example.
> > Thank you in advance.
> >
> > Sun, 24 Jul 2005 23:26:09 +0100, "Michael Kay" <mike@xxxxxxxxxxxx> 
> > ohq`k(`):
> >
> > > The first stage is a classical grouping problem: see
> > > http://www.jenitennison.com/xslt/grouping for advice on using 
> > >Muenchian
> > > grouping in XSLT 1.0, or use the new xsl:for-each-group 
> > instruction 
> > >in 2.0.
> > > (Note, XSLT 1.1 doesn't really exist, it was a working draft that 
> > >wasn't
> > > followed up).
> > > 
> > > Insert the page breaks in a second pass through the data. This is 
> > a 
> > >little
> > > tricky (I use it as an exercise on courses) and requires 
> > processing 
> > >the
> > > sequence using recursion, passing a parameter in the recursive 
> > call 
> > >that
> > > indicates the number of lines processed so far.
> > > 
> > > Michael Kay
> > > http://www.saxonica.com/
> > > 
> > >> -----Original Message-----
> > >> From: John Robb [mailto:john_ok@xxxxxx] 
> > >> Sent: 24 July 2005 22:45
> > >> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > >> Subject: [xsl] Can't solve the following XSL transformation
> > >> 
> > >> I'm a novice in XSLT and doesn't have any experience.Can 
> > you help me 
> > >> to perform the following transformation:
> > >> trasformed data should look as follows:
> > >> 
> > >> ****************
> > >> Sector 1
> > >> ****************
> > >> Subsector 1
> > >> ++++++++++++++++
> > >> ID[t]Value
> > >> ----------------
> > >> id1[t]value1
> > >> ...
> > >> idN valueN
> > >> ----------------
> > >> Subsector 2
> > >> ++++++++++++++++
> > >> ID[t]Value
> > >> ----------------
> > >> id1[t]value1
> > >> ...
> > >> idN valueN
> > >> ...
> > >> ****************
> > >> Sector 2
> > >> ****************
> > >> Subsector 1
> > >> ++++++++++++++++
> > >> ID[t]Value
> > >> ----------------
> > >> id1[t]value1
> > >> ...
> > >> idN valueN
> > >> ----------------
> > >> Subsector 2
> > >> ++++++++++++++++
> > >> ID[t]Value
> > >> ----------------
> > >> id1[t]value1
> > >> ...
> > >> idN valueN
> > >> ...
> > >> 
> > >> There is a limitation: no more than 25 data rows (idX valueX) per 
> > >> page.Page breaks (<span style="page-break-before: 
> > always"></span>) 
> > >> cannot be inserted in the middle of data section but before 
> > >> sector/subsector only.I'm using XSLT v1.1.
> > >> Here is the xml:
> > >> <?xml version="1.0" encoding="iso-8859-1" ?>
> > >> <data>
> > >> [t]<item id="i1"[t]sector="s1"[t]subsector="u1">561</item>
> > >> [t]<item id="i10"[t]sector="s3"[t]subsector="u4">15</item>
> > >> [t]<item id="i22"[t]sector="s2"[t]subsector="u2">1234</item>
> > >> [t]<item id="i11"[t]sector="s1"[t]subsector="u2">123</item>
> > >> [t]<item id="i17"[t]sector="s1"[t]subsector="u3">165</item>
> > >> [t]<item id="i61"[t]sector="s2"[t]subsector="u1">346</item>
> > >> [t]<item id="i12"[t]sector="s2"[t]subsector="u5">3425</item>
> > >> [t]<item id="i2"[t]sector="s3"[t]subsector="u4">78</item>
> > >> [t]<item id="i14"[t]sector="s3"[t]subsector="u4">51</item>
> > >> [t]<item id="i21"[t]sector="s1"[t]subsector="u5">346</item>
> > >> [t]<item id="i39"[t]sector="s3"[t]subsector="u2">463</item>
> > >> [t]<item id="i44"[t]sector="s2"[t]subsector="u3">151</item>
> > >> [t]<item id="i89"[t]sector="s1"[t]subsector="u1">451</item>
> > >> [t]<item id="i81"[t]sector="s2"[t]subsector="u4">771</item>
> > >> [t]<item id="i36"[t]sector="s2"[t]subsector="u5">5654</item>
> > >> [t]<item id="i27"[t]sector="s3"[t]subsector="u3">362</item>
> > >> [t]<item id="i15"[t]sector="s1"[t]subsector="u5">234</item>
> > >> [t]<item id="i18"[t]sector="s3"[t]subsector="u2">73</item>
> > >> [t]<item id="i51"[t]sector="s3"[t]subsector="u5">567</item>
> > >> [t]<item id="i26"[t]sector="s1"[t]subsector="u4">17</item>
> > >> [t]<item id="i95"[t]sector="s3"[t]subsector="u5">67489</item>
> > >> [t]<item id="i13"[t]sector="s1"[t]subsector="u3">54</item>
> > >> [t]<item id="i71"[t]sector="s1"[t]subsector="u3">2</item>
> > >> [t]<item id="i23"[t]sector="s2"[t]subsector="u1">345</item>
> > >> [t]<item id="i7"[t]sector="s2"[t]subsector="u1">67</item>
> > >> [t]<item id="i80"[t]sector="s1"[t]subsector="u3">7754</item>
> > >> [t]<item id="i9"[t]sector="s3"[t]subsector="u4">343</item>
> > >> [t]<item id="i4"[t]sector="s1"[t]subsector="u2">51</item>
> > >> [t]<item id="i99"[t]sector="s3"[t]subsector="u5">5637</item>
> > >> [t][t]
> > >> [t][t]<sector id="s1">Sector 1</sector>
> > >> [t]<sector id="s2">Sector 2</sector>
> > >> [t]<sector id="s3">Sector 3</sector>
> > >> 
> > >> [t]<subsector id="u1">Subsector 1</subsector>
> > >> [t]<subsector id="u2">Subsector 2</subsector>
> > >> [t]<subsector id="u3">Subsector 3</subsector>
> > >> [t]<subsector id="u4">Subsector 4</subsector>
> > >> [t]<subsector id="u5">Subsector 5</subsector>
> > >> </data>

  
  
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