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Subject: Re: Problem using recursive apply-templates calls
From: George Cristian Bina <george@xxxxxxxxxxxxx>
Date: Tue, 12 Sep 2006 11:48:36 +0300
Hi Allison,

Your

<xsl:apply-templates select="../../Performers"/>

will cause the <xsl:template match="Performers"> to be matched exactly in the same context as it was matched initially when you called

<xsl:apply-templates select="Performers">
 <xsl:with-param name="performerLevels" select="2"/>
</xsl:apply-templates>

This causes an infinite loop.

A possible solution is to iterate first the individual speakers and print their information, then all the group performers and print group info. If you define two keys to match moderators and speakers for each group then you can just iterate on moderators and print their info and on speakers and print their info for each group. You can find below such a stylesheet, hope that helps.


<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:key name="moderators" match="Performer[PerformerTypes/PerformerType[.='Moderator']]"
use="PerformerParentID"/>
<xsl:key name="speakers" match="Performer[PerformerTypes/PerformerType[.='Speaker']]"
use="PerformerParentID"/>

<xsl:template match="/">
<!-- Determine which TIMEFRAME to render -->
<html>
<body> Here are the events: <xsl:choose>
<xsl:when test="/Events/View/Timeframe='event'">
<xsl:call-template name="TimeframeEvent"/>
</xsl:when>
<xsl:when test="/Events/View/Timeframe='day'"> Do nothing </xsl:when>
</xsl:choose>
</body>
</html>
</xsl:template>

<xsl:template name="TimeframeEvent">
<xsl:for-each select="/Events/Event[@type='EventDetail'][position()&lt;= 1]">
<br/>
<div class="event">
<xsl:apply-templates select="Performers"/>
</div>
</xsl:for-each>
</xsl:template>

<xsl:template match="Performers">
<xsl:for-each
select="Performer[not(PerformerParentID) and not(PerformerTypes/PerformerType[.='Group'])]">
<!-- Individual performers -->
<p>
<xsl:text>Featured speaker:</xsl:text>
<xsl:call-template name="printPerformerInfo"/>
</p>
</xsl:for-each>

<xsl:for-each select="Performer[PerformerTypes/PerformerType[.='Group']]">
<!-- Groups -->
<p>
<xsl:text>Performer Group:</xsl:text>
<xsl:value-of select="Name/FullName"/>
<xsl:variable name="moderators" select="key('moderators', PerformerID)"/>
<xsl:variable name="speakers" select="key('speakers', PerformerID)"/>
<p>
<label>Moderator<xsl:if test="count($moderators) &gt; 1">s</xsl:if>: </label>
<xsl:for-each select="$moderators">
<xsl:call-template name="printPerformerInfo"/>
<xsl:if test="not(last() =position())">
<xsl:text>; </xsl:text>
</xsl:if>
</xsl:for-each>
<br/>
<xsl:for-each select="$speakers">
<label>Speaker: </label>
<xsl:call-template name="printPerformerInfo"/>
<xsl:if test="not(last() =position())">
<br/>
</xsl:if>
</xsl:for-each>
</p>
</p>
</xsl:for-each>

</xsl:template>
<xsl:template name="printPerformerInfo">
<xsl:choose>
<xsl:when test="WebPages/WebPage/URL != ''">
<a href="{WebPages/WebPage/URL}">
<xsl:value-of select="Name/FullName"/>
</a>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="Name/FullName"/>
</xsl:otherwise>
</xsl:choose>
<xsl:if test="ProfessionalAffiliations/ProfessionalAffiliation/JobTitles/JobTitle != ''">,
<xsl:value-of select="ProfessionalAffiliations/ProfessionalAffiliation/JobTitles/JobTitle"/>
</xsl:if>
<xsl:if test="ProfessionalAffiliations/ProfessionalAffiliation/OrganizationName != ''">, <xsl:choose>
<xsl:when

test="ProfessionalAffiliations/ProfessionalAffiliation/OrganizationWebPages/WebPage/URL != ''">
<a

href="{ProfessionalAffiliations/ProfessionalAffiliation/OrganizationWebPages/WebPage/URL}">
<xsl:value-of select="ProfessionalAffiliations/ProfessionalAffiliation/OrganizationName"
/>
</a>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="ProfessionalAffiliations/ProfessionalAffiliation/OrganizationName"/>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</xsl:template>

</xsl:stylesheet>

On something like
<?xml version="1.0" encoding="UTF-8"?>
<Events>
    <View>
        <Timeframe>event</Timeframe>
    </View>
    <Event type="EventDetail">
        <EventID>1300</EventID>
        <EventTitle>Daily recurring event 18</EventTitle>
        <DateTime>
            <TimeStamp>1157396400</TimeStamp>
            <StartDate>2006-09-04</StartDate>
            <StartTime>12:00:00</StartTime>
            <EndDate>2006-09-04</EndDate>
            <EndTime>12:00:00</EndTime>
        </DateTime>
        <Performers>
            <Performer>
                <PerformerID>2018</PerformerID>
                <Name>
                    <FullName>Performer group</FullName>
                </Name>
                <PerformerTypes>
                    <PerformerType>Group</PerformerType>
                </PerformerTypes>
                <WebPages>
                    <WebPage>

                        <URL>http://www.joffrey.com/</URL>
                    </WebPage>
                </WebPages>
            </Performer>
            <Performer>
                <PerformerID>2019</PerformerID>
                <Name>
                    <FullName>Performer in Performer Group</FullName>
                </Name>
                <PerformerTypes>

                    <PerformerType>Moderator</PerformerType>
                </PerformerTypes>
                <ProfessionalAffiliations>
                    <ProfessionalAffiliation>
                        <JobTitles>

                            <JobTitle>Performer</JobTitle>
                        </JobTitles>

                        <OrganizationName>Org</OrganizationName>
                        <OrganizationWebPages>
                            <WebPage>

                                <URL>http://www.org.com</URL>
                            </WebPage>
                        </OrganizationWebPages>
                    </ProfessionalAffiliation>
                </ProfessionalAffiliations>
                <WebPages>
                    <WebPage>

<URL>http://www.performer.com</URL>
</WebPage>
</WebPages>
<PerformerParentID>2018</PerformerParentID>
</Performer>
<Performer>
<PerformerID>2019</PerformerID>
<Name>
<FullName>Performer Speaker in Performer Group</FullName>
</Name>
<PerformerTypes>

                    <PerformerType>Speaker</PerformerType>
                </PerformerTypes>
                <ProfessionalAffiliations>
                    <ProfessionalAffiliation>
                        <JobTitles>

                            <JobTitle>Performer</JobTitle>
                        </JobTitles>

                        <OrganizationName>Org</OrganizationName>
                        <OrganizationWebPages>
                            <WebPage>

                                <URL>http://www.org.com</URL>
                            </WebPage>
                        </OrganizationWebPages>
                    </ProfessionalAffiliation>
                </ProfessionalAffiliations>
                <WebPages>
                    <WebPage>

                        <URL>http://www.performer.com</URL>
                    </WebPage>
                </WebPages>
                <PerformerParentID>2018</PerformerParentID>
            </Performer>

            <Performer>
                <PerformerID>2019</PerformerID>
                <Name>
                    <FullName>Performer InNoGroup</FullName>
                </Name>
                <PerformerTypes>
                    <PerformerType>None</PerformerType>
                </PerformerTypes>
                <ProfessionalAffiliations>
                    <ProfessionalAffiliation>
                        <JobTitles>
                            <JobTitle>Performer</JobTitle>
                        </JobTitles>
                        <OrganizationName>Org</OrganizationName>
                        <OrganizationWebPages>
                            <WebPage>
                                <URL>http://www.org.com</URL>
                            </WebPage>
                        </OrganizationWebPages>
                    </ProfessionalAffiliation>
                </ProfessionalAffiliations>
                <WebPages>
                    <WebPage>

                        <URL>http://www.performer.com</URL>
                    </WebPage>
                </WebPages>

            </Performer>
        </Performers>
    </Event>
</Events>

it gives
 Here are the events:

Featured speaker:Performer InNoGroup, Performer, Org

Performer Group:Performer group
 Moderator:  Performer in Performer Group, Performer, Org
 Speaker:  Performer Speaker in Performer Group, Performer, Org


Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com


Allison Bloodworth wrote:
Hi,

I want to create an XSL stylesheet that will display information on a
calendar event. I have an XML document containing all the event information.
In this our system, performers can be groups which contain other performers.
If the performer is part of a group, it has a PerformerParentID. 

I am trying to create a stylesheet that goes through all the performers and
prints information first for only individual performers grouped by performer
type(I know there are still some problems with this that I haven't
completely worked out yet) and then prints the performer groups. Then I want
to recursively call my Performer template to print the performers that are
part of the groups in the same way performers are printed out, but under the
appropriate group heading. Something like this:

Featured speaker: Totally individual performer - in no group, Manager, IBM
Performer Group: Group #1
	Moderator: Performer #1 in Group #1, Facilitator, SAP
	Speaker: Performer #2 in Group #1, Manager, SAP

I first tried to use a global variable to count the number of recursive
calls I wanted to do (I know that there are only two levels of performer
groups in our systems so I stop there), but that didn't work. So I tried to
follow Bob DuCharme's recommendation here:
http://www.xml.com/pub/a/2001/08/01/gettingloopy.html?page=2 However, my
implementation is slightly different as I have to use apply-templates
instead of call-template since I'm changing the context node. But this isn't
working either, and when I test it out in Oxygen with Saxon 8b I'm getting a
message that there are "Too many nested apply-templates calls. The
stylesheet is probably looping." I am also the transform using PHP 5's
standard XSLT processor and having the same problem.

Any thoughts or suggestions are appreciated! Here are snippets of the
appropriate code:

<?xml version="1.0" encoding="UTF-8"?>
<Events>
<View>
<Timeframe>event</Timeframe> </View>
<Event type="EventDetail">
<EventID>1300</EventID>
<EventTitle>Daily recurring event 18</EventTitle>
<DateTime>
<TimeStamp>1157396400</TimeStamp>
<StartDate>2006-09-04</StartDate>
<StartTime>12:00:00</StartTime>
<EndDate>2006-09-04</EndDate>
<EndTime>12:00:00</EndTime>
</DateTime>
<Performers>
<Performer>
<PerformerID>2018</PerformerID>
<Name>
<FullName>Performer group</FullName>
</Name>
<PerformerTypes>
<PerformerType>Group</PerformerType>
</PerformerTypes>
<WebPages>
<WebPage>

<URL>http://www.joffrey.com/</URL>
</WebPage>
</WebPages>
</Performer>
<Performer>
<PerformerID>2019</PerformerID>
<Name>
<FullName>Performer in Performer
Group</FullName>
</Name>
<PerformerTypes>

<PerformerType>Moderator</PerformerType>
</PerformerTypes>
<ProfessionalAffiliations>
<ProfessionalAffiliation>
<JobTitles>

<JobTitle>Performer</JobTitle>
</JobTitles>

<OrganizationName>Org</OrganizationName>
<OrganizationWebPages>
<WebPage>

<URL>http://www.org.com</URL>
</WebPage>
</OrganizationWebPages>
</ProfessionalAffiliation>
</ProfessionalAffiliations>
<WebPages>
<WebPage>

<URL>http://www.performer.com</URL>
</WebPage>
</WebPages>
<PerformerParentID>2018</PerformerParentID>
</Performer>
</Performers>
</Event>
</Events>
----------------------------------------
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<!--- There are a bunch of variables here that I didn't include and the
stylesheet is greatly simplified but can send full info on if necessary. The
recursive call is marked "HERE IS THE RECURSIVE CALL" below. -->

<xsl:template match="/">
	<!-- Determine which TIMEFRAME to render -->
	<html>
	<body>
Here are the events:
	<xsl:choose>
		<xsl:when test="/Events/View/Timeframe='event'">
			<xsl:call-template name="TimeframeEvent"/>
		</xsl:when>
		<xsl:when test="/Events/View/Timeframe='day'">
			Do nothing
		</xsl:when>
	</xsl:choose>
	</body>
	</html>
</xsl:template>

<xsl:template name="TimeframeEvent">

	<xsl:for-each select="/Events/Event[@type='EventDetail'][position()
&lt;= 1]">
		<br />
		<div class="event">

<!-- Performers DONE-->

			About to call the Performers template and the
current node is <xsl:value-of select="name()"/>
			<xsl:apply-templates select="Performers">
				<xsl:with-param name="performerLevels"
select="2"/>
			</xsl:apply-templates>
		</div>
	</xsl:for-each>
</xsl:template>

<xsl:template match="Performers">
	<xsl:param name="performerLevels">2</xsl:param>
	
	<!-- Moderators -->
	<xsl:if
test="Performer/PerformerTypes/PerformerType[.='Moderator']">
		<p>
			<label>Moderator<xsl:if
test="count(Performer/PerformerTypes/PerformerType[.='Moderator']) &gt;
1">s</xsl:if>: </label>
			<xsl:for-each
select="Performer/PerformerTypes/PerformerType[.='Moderator']">
				<xsl:if test="count(../../PerformerParentID)
= 0">
					<xsl:choose>
						<xsl:when
test="../../WebPages/WebPage/URL != ''">
							<a
href="{../../WebPages/WebPage/URL}"><xsl:value-of
select="../../Name/FullName"/></a>
						</xsl:when>
						<xsl:otherwise>
							<xsl:value-of
select="../../Name/FullName"/>
						</xsl:otherwise>
					</xsl:choose>

					<xsl:if
test="../../ProfessionalAffiliations/ProfessionalAffiliation/JobTitles/JobTi
tle != ''">,
						<xsl:value-of
select="../../ProfessionalAffiliations/ProfessionalAffiliation/JobTitles/Job
Title"/>
					</xsl:if>

					<xsl:if
test="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationNam
e != ''">,

						<xsl:choose>
							<xsl:when
test="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationWeb
Pages/WebPage/URL != ''">
								<a
href="{../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationWe
bPages/WebPage/URL}"><xsl:value-of
select="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationN
ame"/></a>
							</xsl:when>
							<xsl:otherwise>
	
<xsl:value-of
select="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationN
ame"/>
							</xsl:otherwise>
						</xsl:choose>
					</xsl:if>

					<xsl:if test="not(last() =
position())">
						<xsl:text>; </xsl:text>
					</xsl:if>
				</xsl:if>
			</xsl:for-each>
		</p>
	</xsl:if>
	<!-- Performer Group -->
	<xsl:if test="Performer/PerformerTypes/PerformerType[.='Group']">
		<p>
			<label>Performer Group<xsl:if
test="count(Performer/PerformerTypes/PerformerType[.='Group']) &gt;
1">s</xsl:if>: </label>
			<xsl:for-each
select="Performer/PerformerTypes/PerformerType[.='Group']">
				<xsl:variable name="groupID"
select="../../PerformerID"/>

				<xsl:choose>
					<xsl:when
test="../../WebPages/WebPage/URL != ''">
						<a
href="{../../WebPages/WebPage/URL}"><xsl:value-of
select="../../Name/FullName"/></a>
					</xsl:when>
					<xsl:otherwise>
						<xsl:value-of
select="../../Name/FullName"/>
					</xsl:otherwise>
				</xsl:choose>

				<xsl:if
test="../../ProfessionalAffiliations/ProfessionalAffiliation/JobTitles/JobTi
tle != ''">,
					<xsl:value-of
select="../../ProfessionalAffiliations/ProfessionalAffiliation/JobTitles/Job
Title"/>
				</xsl:if>

				<xsl:if
test="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationNam
e != ''">,

					<xsl:choose>
						<xsl:when
test="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationWeb
Pages/WebPage/URL != ''">
							<a
href="{../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationWe
bPages/WebPage/URL}"><xsl:value-of
select="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationN
ame"/></a>
						</xsl:when>
						<xsl:otherwise>
							<xsl:value-of
select="../../ProfessionalAffiliations/ProfessionalAffiliation/OrganizationN
ame"/>
						</xsl:otherwise>
					</xsl:choose>
				</xsl:if>

				<xsl:if test="not(last() = position())">
					<xsl:text>; </xsl:text>
				</xsl:if>
				<xsl:for-each select="../../../Performer">
					I am inside the for-each and
PerformerParentID is <xsl:value-of select="PerformerParentID"/> and groupID
is <xsl:value-of select="$groupID"/><br/>
					<xsl:if test="PerformerParentID =
$groupID">
					Inside the current node is
<xsl:value-of select="name()"/><br/>
						<xsl:if
test="$performerLevels > 0">
							performer levels are
<xsl:value-of select="$performerLevels"/><br/>
							<!--HERE IS THE
RECURSIVE CALL-->
							<xsl:apply-templates
select="../../Performers"/>
						</xsl:if>
					</xsl:if>
				</xsl:for-each>
			</xsl:for-each>
		</p>
	</xsl:if>
</xsl:template>
<!-- NOTE:  END PERFORMERS TEMPLATE ////////////////////////////////// -->
</xsl:stylesheet>

Allison Bloodworth
Principal Administrative Analyst
Technology Program Office
University of California, Berkeley
(415) 377-8243
abloodworth@xxxxxxxxxxxx

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