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Please bear with me, I have been reading about XSL for a couple hours.

I have an XML document that contains multiple <page> tags interspersed
throughout the tree.

<text>
....
<page>1</page>
....
<page>2</page>
</text>

These are not always going to be in the same level. To get the sequence
of all the pages I correctly figured I could use:

<xsl:template match="/">
<xsl:for-each select='.//page'>
Page <xsl:value-of select="text()"/><br/>
</xsl:for-each>
</xsl:template>

I also want to evaluate whether the text value of the current <page>
node is in sequence with the previous one, if not then mark the output.
I would have imagined that it would be something like this but it
doesnt work:

<xsl:template match="/">
<xsl:for-each select='.//page'>
<xsl:variable name="this_page_number" select="text()"/>
<xsl:variable name="thispos" select="position()"/>
<xsl:variable name="prev_page_number" select=".//page[$thispos
- 1]/text()"/>
<xsl:variable name="expected_prev_page_number"
select="$this_page_number - 1"/>
<xsl:if test="$expected_prev_page_number != $prev_page_number">
<strong>Sequence broken!</strong>
</xsl:if>
Page <xsl:value-of select="$this_page_number"/><br/>
</xsl:for-each>
</xsl:template>

I obviously have not yet grasped XSL. What is the correct solution?

Thank you,

Cali

I think what might work is to get the sequence of page nodes, then do a
recursive template call where each call examines the first 2 nodes, and passes
a copy of the node set, minus the first node to itself using the remove()
function to remove the node.

On 9 Aug 2005 23:01:15 -0700, "Cali" <killycali007-> wrote:

>Please bear with me, I have been reading about XSL for a couple hours.
>
>I have an XML document that contains multiple <page> tags interspersed
>throughout the tree.
>
><text>
>...
><page>1</page>
>...
><page>2</page>
></text>
>
>These are not always going to be in the same level. To get the sequence
>of all the pages I correctly figured I could use:
>
><xsl:template match="/">
> <xsl:for-each select='.//page'>
> Page <xsl:value-of select="text()"/><br/>
> </xsl:for-each>
></xsl:template>
>
>I also want to evaluate whether the text value of the current <page>
>node is in sequence with the previous one, if not then mark the output.
>I would have imagined that it would be something like this but it
>doesnt work:
>
><xsl:template match="/">
> <xsl:for-each select='.//page'>
> <xsl:variable name="this_page_number" select="text()"/>
> <xsl:variable name="thispos" select="position()"/>
> <xsl:variable name="prev_page_number" select=".//page[$thispos
>- 1]/text()"/>
> <xsl:variable name="expected_prev_page_number"
>select="$this_page_number - 1"/>
> <xsl:if test="$expected_prev_page_number != $prev_page_number">
> <strong>Sequence broken!</strong>
> </xsl:if>
> Page <xsl:value-of select="$this_page_number"/><br/>
> </xsl:for-each>
></xsl:template>
>
>I obviously have not yet grasped XSL. What is the correct solution?
>
>Thank you,
>
>Cali

Hi,

Tempore 08:01:15, die Wednesday 10 August 2005 AD, hinc in foro {comp.text.xml} scripsit Cali <killycali007->:

> Please bear with me, I have been reading about XSL for a couple hours.
>
> I have an XML document that contains multiple <page> tags interspersed
> throughout the tree.
>
> <text>
> ...
> <page>1</page>
> ...
> <page>2</page>
> </text>
>
> I also want to evaluate whether the text value of the current <page>
> node is in sequence with the previous one, if not then mark the output.
> I would have imagined that it would be something like this but it
> doesnt work.

Instead of going to mess with 'position()', try the more reliable 'preceding' axis:

<xsl:template match="/">
<xsl:for-each select='.//page'>
<xsl:variable name="this_page_number" select="."/>
<xsl:variable name="prev_page_number" select="preceding:age[1]"/>
<xsl:variable name="expected_prev_page_number" select="$this_page_number - 1"/>
<xsl:if test="$expected_prev_page_number != $prev_page_number">
<strong>Sequence broken!</strong>
</xsl:if>
Page <xsl:value-of select="$this_page_number"/><br/>
</xsl:for-each>
</xsl:template>


regards,
--
Joris Gillis (http://users.telenet.be/root-jg/me.html)
Vincit omnia simplicitas
Keep it simple