hCalender glean

[AnchorMan]

Hallo zusammen,

ich setze mich mit der glean-hcal.xsl auseinander, die dazu dient, hCalendar Informationen aus HTML-Seiten herauszufiltern.

Dabei habe ich ein grundsätzliches Verständnisproblem: Wozu dient der Parameter "Anchor", der ziemlich früh definiert wird und später immer wieder bei if test-Bedingungen auftaucht? Welchen Wert hat er bei den Bedingungen?

  
<xsl:stylesheet version="1.0">  
<xsl:output indent="yes" method="xml"/>  
<xsl:param name="prodid" select=""-//connolly.w3.org//RDF Calendar $Date: 2007/06/30 19:05:32 $ (BETA)//EN""/>  
<xsl:param name="CalNS">http://www.w3.org/2002/12/cal/icaltzd#</xsl:param>  
<xsl:param name="XdtNS">http://www.w3.org/2001/XMLSchema#</xsl:param>  
<!-- by Dan Connolly -->  
−  
<!--  
  
  
acks...  
  
brian suda  
[e-mail]  
http://suda.co.uk/  
  
XHTML-2-vCard  
Version 0.5.1  
2005-07-08  
  
Copyright 2005 Brian Suda  
This work is licensed under the Creative Commons Attribution-ShareAlike License.  
To view a copy of this license, visit  
http://creativecommons.org/licenses/by-sa/1.0/  
-->  
−  
<!--  
Best Practices states this should be  
    the URL the calendar was transformed from  
-->  
−  
<xsl:param name="Source">  
−  
<xsl:choose>  
−  
<xsl:when test="h:html/h:head/h:link[@rel="base"]">  
<xsl:value-of select="h:html/h:head/h:link[@rel="base"]/@href"/>  
</xsl:when>  
−  
<xsl:when test="h:html/h:head/h:base">  
<xsl:value-of select="h:html/h:head/h:base/@href"/>  
</xsl:when>  
</xsl:choose>  
</xsl:param>  
<xsl:param name="Anchor"/>  
<!-- find a vcard  for my-events idiom -->  
<xsl:param name="Me" select="//*[contains(concat(' ', normalize-space(@class), ' '),      ' organizer ')]/@id"/>  
−  
<xsl:template match="/">  
−  
<r:RDF>  
−  
<!--  
 The Vcalendar object used to be existentially quantified,  
	 but it's convenient to be able to refer to it by URI,  
	 so we say the Source document is the Vcalendar.  
  
-->  
−  
<c:Vcalendar r:about="{$Source}">  
−  
<c:prodid>  
<xsl:value-of select="$prodid"/>  
</c:prodid>  
<c:version>2.0</c:version>  
<xsl:apply-templates/>  
</c:Vcalendar>  
</r:RDF>  
</xsl:template>  
<!-- Each event is listed in succession -->  
−  
<xsl:template match="*[contains(concat(' ',normalize-space(@class),' '),' vevent ')]">  
−  
<xsl:if test="not($Anchor) or @id = $Anchor">  
−  
<c:component>  
−  
<c:Vevent>  
<xsl:call-template name="cal-props"/>  
</c:Vevent>  
</c:component>  
</xsl:if>  
</xsl:template>  
<!-- ... and todos. -->  
−  
<xsl:template match="*[contains(concat(' ', normalize-space(@class), ' '),' vtodo ')]">  
−  
<xsl:if test="not($Anchor) or @id = $Anchor">  
−  
<c:component>  
−  
<c:Vtodo>  
<xsl:call-template name="cal-props"/>  
</c:Vtodo>  
</c:component>  
</xsl:if>  
</xsl:template>  
−  
<xsl:template name="cal-props">  
<!-- make a UID out of the Source URI and the ID -->  
−  
<xsl:if test="@id and $Source">  
−  
<xsl:attribute name="r:about">  
<xsl:value-of select="concat($Source, "#", @id)"/>  
</xsl:attribute>  
</xsl:if>  
−  
<!--  
 if parent of vevent has class my-events, then $Me  
         is an attendee.  
-->  
−  
<xsl:if test="contains(concat(' ', normalize-space(../@class), ' '),                            ' my-events ')">  
<c:organizer r:resource="{concat($Source, "#", $Me)}"/>  
</xsl:if>  
−  
<xsl:call-template name="textProp">  
<xsl:with-param name="class">uid</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="dateProp">  
<xsl:with-param name="class">dtstamp</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="textProp">  
<xsl:with-param name="class">summary</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="textProp">  
<xsl:with-param name="class">description</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="dateProp">  
<xsl:with-param name="class">dtstart</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="dateProp">  
<xsl:with-param name="class">dtend</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="durProp">  
<xsl:with-param name="class">duration</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="refProp">  
<xsl:with-param name="class">url</xsl:with-param>  
−  
<xsl:with-param name="default">  
−  
<xsl:choose>  
−  
<xsl:when test="@id">  
<xsl:value-of select="concat($Source, "#", @id)"/>  
</xsl:when>  
−  
<xsl:otherwise>  
<xsl:value-of select="$Source"/>  
</xsl:otherwise>  
</xsl:choose>  
</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="textProp">  
<xsl:with-param name="class">location</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="textProp">  
<xsl:with-param name="class">status</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="floatPairProp">  
<xsl:with-param name="class">geo</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="recurProp">  
<xsl:with-param name="class">rrule</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="dateProp">  
<xsl:with-param name="class">exdate</xsl:with-param>  
</xsl:call-template>  
−  
<xsl:call-template name="whoProp">  
<xsl:with-param name="class">attendee</xsl:with-param>  
</xsl:call-template>  
</xsl:template>  
−  
<xsl:template name="textProp">  
<xsl:param name="class"/>  
−  
<xsl:for-each select=".//*[    contains(concat(' ', @class, ' '),    concat(' ', $class, ' '))]">  
−  
  
......