Re: A challenge.. Group Periods of Data (1..5, 2..8, 4..9) (10..12; 10..

A solution... (sorry, I lean heavily on xxx:node-set)

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0"
        xmlns:ms="urn:schemas-microsoft-com:xslt">


<xsl:output method="xml"/>

<xsl:variable name="MIN_RANGE_VALUE">0</xsl:variable>
<xsl:variable name="MAX_RANGE_VALUE">99999</xsl:variable>
<xsl:variable name="CURRENT" select="/"/>
<xsl:template match="A">

                        <xsl:variable name="for_period_match">
                                <xsl:apply-templates select="B"  
mode="for_period_match" />
                        </xsl:variable>

                        <xsl:variable name="periods">
                                <xsl:element name="result">
                                        <xsl:apply-templates 
select="ms:node-set($for_period_match)//B"
mode="periods"/>
                                </xsl:element>
                        </xsl:variable>
                        
                        <xsl:variable name="periods_transformed">
                                <xsl:apply-templates 
select="ms:node-set($periods)//result"
mode="transform_periods"/>
                        </xsl:variable>
                        
                        <xsl:element name="result">
                                <xsl:copy-of 
select="ms:node-set($periods_transformed)"/>
                        </xsl:element>

</xsl:template>

<xsl:template match="result" mode="transform_periods">
        <xsl:apply-templates select="periods" mode="transform_periods"/>
</xsl:template>

<xsl:template match="periods" mode="transform_periods">
        <xsl:element name="periods">
                <xsl:attribute name="begin"><xsl:value-of
select="B[1]/@period_begin"/></xsl:attribute>
                <xsl:attribute name="end"><xsl:value-of
select="B[last()]/@period_end"/></xsl:attribute>
                <xsl:apply-templates select="B" mode="transform_periods"/>
        </xsl:element>
</xsl:template>

<xsl:template match="B" mode="transform_periods">
        <xsl:copy-of select="." />
</xsl:template>

<xsl:template match="B[preceding-sibling::B/@period_begin &lt;=
@period_begin and preceding-sibling::B/@period_end &gt;=
@period_begin]" mode="for_period_match">
                <xsl:apply-templates select="* | @*" mode="for_period_match"/>
</xsl:template>

<xsl:template match="* | @*" mode="for_period_match">
        <xsl:copy>
                <xsl:apply-templates select="* | @*" mode="for_period_match"/>
        </xsl:copy>
</xsl:template>

<xsl:template match="B" mode="periods">
        <xsl:variable name="min_range_value" select="@period_begin"/>
        <xsl:variable name="max_range_value">
        <xsl:choose>
                <xsl:when test="following-sibling::B/@period_begin">
                        <xsl:value-of 
select="following-sibling::B/@period_begin"/>
                </xsl:when>
                <xsl:otherwise>
                        <xsl:value-of select="$MAX_RANGE_VALUE"/>
                </xsl:otherwise>
        </xsl:choose>
        </xsl:variable>
        
        <xsl:element name="periods">
                <xsl:apply-templates select="$CURRENT//B[(_at_)period_begin 
&gt;=
$min_range_value and @period_end &lt; $max_range_value]" />
        </xsl:element>
        
</xsl:template>

<xsl:template match="* | @*">
        <xsl:copy>
                <xsl:apply-templates select="* | @*" />
        </xsl:copy>
</xsl:template>
</xsl:stylesheet>

On 5/3/05, Michael Kay <mike(_at_)saxonica(_dot_)com> wrote:
> > > You mean you want the
> > > stylesheet to detect a time at which no sessions are alive,
> > and use that as
> > > a boundary between periods? What if there is no such time?
> > First element of period:  first element or first element where
> > period_begin does not fall within previous sibling period_begin and
> > period_end.
> >
> > Last element of period:  last element match where period_begin falls
> > within previous sibling period_begin and period_end.
> >
> > > What if there are several?
> This then sounds like a simple extension of Wendell's stylesheet, where
> instead of the list of periods being supplied as a parameter, it is
> constructed by a prescan of the data: the set of period boundaries is the
> set of session endtimes that do not overlap any session, i.e.
>
> //session/@endtime[every $s in //session satisfies ($s/@starttime <= . or
> $s/@endtime >= .)]
>
> (Sorry, I've forgotten what the actual element and attribute names were).
>
> Someone who enjoys coding with one hand tied behind their back can no doubt
> give you an XSLT 1.0 version of that...
>
> Michael Kay
> http://www.saxonica.com/
>
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