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Re: [xsl] Subdividing sets of elements by sequence identifiers

2011-08-09 15:43:03
On 09/08/2011 20:37, Mark wrote:
I have an "almost works" situation. The template and simplified input are below. What I want to is "re-wrap images with consecutive image numbers (in my output example "27,28,29") in a new <h6> element for HTML display purposes. To do this,at the beginning of such a sequence, I must close off the <h6> inserted by the current template with a </h6> and open a new <h6>. Here only one sequence is shown, but several are possible within each element.

I suspect I am thinking about this procedurally rather than imperatively, and thus cannot see the forest for the trees. All suggestions appreciated.

Actually I think you are having trouble seeing the trees for the tags...

There's a David Carlisle trick for this one:

<xsl:for-each-group select="Stamp" group-adjacent="@image-number - position()">
<h6>
    ...
</h6>
</xsl:for-each-group>

Three consecutive elements with image numbers 27, 28, 29 in positions 5, 6, 7 will have grouping keys 22, 22, 22, so they end up in the same group.

Michael Kay
Saxonica

Mark

Selection from current output:
<List>
<h1>Art on Stamps</h1>
<h2>1993</h2>
<h6>
<a href="../img/1993/5.jpg" target="_blank">
<img src="../img/1993/5.jpg" alt="stamp image" width="100" border="2px"></img>
</a>
<!-- ********** need to insert </h6><h6> here ************* -->

<a href="../img/1993/27.jpg" target="_blank">
<img src="../img/1993/27.jpg" alt="stamp image" width="100" border="2px"></img>
</a>
<a href="../img/1993/28.jpg" target="_blank">
<img src="../img/1993/28.jpg" alt="stamp image" width="100" border="2px"></img>
</a>
<a href="../img/1993/29.jpg" target="_blank">
<img src="../img/1993/29.jpg" alt="stamp image" width="100" border="2px"></img>
</a>
</h6>
......
</List>

My Template:
<xsl:template match="Item">
<h1>
<xsl:value-of select="@concept"></xsl:value-of>
</h1>
<xsl:for-each-group select="Stamp" group-by="Date/@year">
<xsl:sort select="Date/@year"></xsl:sort>
<h2>
<xsl:value-of select="Date/@year"></xsl:value-of>
</h2>
<h6>
<xsl:for-each select="current-group()">
<xsl:variable name="image" select="concat('../img/', Date/@year, '/', @image-number, '.jpg')"></xsl:variable>
<a href="{$image}" target="_blank">
<img src="{$image}" alt="stamp image" width="100" border="2px"></img>
</a>
</xsl:for-each>
</h6>
</xsl:for-each-group>
</xsl:template>

My Input: (simplified to a single <Item> from the <List>
<List>
<Item concept="Art on Stamps">
<Stamp image-number="5">
<Date year="1993"></Date>
</Stamp>
<Stamp image-number="27" >
<Date year="1993"></Date>
</Stamp>
<Stamp image-number="28">
<Date year="1993"></Date>
</Stamp>
<Stamp image-number="29" >
<Date year="1993"></Date>
</Stamp>
<Stamp image-number="42" >
<Date year="1994"></Date>
</Stamp>
<Stamp image-number="43">
<Date year="1994"></Date>
</Stamp>
<Stamp image-number="44">
<Date year="1994"></Date>
</Stamp>
<Stamp image-number="57" >
<Date year="1994" ></Date>
</Stamp>
<Stamp image-number="58">
<Date year="1994"></Date>
</Stamp>
<Stamp image-number="59">
<Date year="1994"></Date>
</Stamp>
<Stamp image-number="96">
<Date year="1995"></Date>
</Stamp>
<Stamp image-number="97" >
<Date year="1995"></Date>
</Stamp>
<Stamp image-number="98">
<Date year="1995" ></Date>
</Stamp>
</Item>
</List>



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