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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Performance problems with grouping
 is it possible to use the <xsl:key> function on a node-set returned by the ext:node-set() function ? What I am performing is the following: - I combine two xml files to one (by means of the document() function) - this temporary xml file is transformed into a node-set by means of the node-set() extension function Now on this temporary file I want to perform grouping. I am using the axis preceding-sibling (a number of times) which produces the correct output. But this is causing big performance problems. For an xml source of about 1MB it already takes a very long time (more than half a hour !). I know that the xsl:key is a faster way, but I don't think I can use that for a temp tree, can I ? Temp tree: <extended_root> <object name="object1" timestamp="15:00:00" instance="0" package="pack1" value="1"/> <object name="object2" timestamp="15:00:00" instance="0" package="pack2" value="1"/> <object name="object3" timestamp="15:00:00" instance="0" package="pack1" value="3"/> <object name="object1" timestamp="15:00:00" instance="1" package="pack1" value="4"/> <object name="object1" timestamp="15:30:00" instance="0" package="pack1" value="1"/> <object name="object2" timestamp="15:30:00" instance="0" package="pack2" value="1"/> <object name="object3" timestamp="15:30:00" instance="0" package="pack1" value="4"/> <object name="object1" timestamp="15:30:00" instance="1" package="pack1" value="3"/> </extended_root> Pro package I need one header with an enumeration of all objects for this package: HEADER;pack1;object1;object3;object4 Under each header a grouping is needed pro timestamp and pro instance. All values for that belongs to this grouping are added to the entry HEADER;pack1;object1;object3 pack1;;SCANNER;15:00:00;Instance0;1,3 pack1;;SCANNER;15:00:00;Instance1;4,-1 pack1;;SCANNER;15:30:00;Instance0;1,4 pack1;;SCANNER;15:30:00;Instance1;3,-1 HEADER;pack2;object2 pack2;;SCANNER;15:00:00;Instance0;1 pack2;;SCANNER;15:30:00;Instance1;1 To achieve this I have following template: <xsl:template match="extended_root"> <xsl:for-each select="object"> <xsl:variable name="currentPackage" select="@package"/> <xsl:variable name="currentInstance" select="@instance"/> <xsl:variable name="currentDateTime" select="@timestamp"/> <xsl:if test="not(preceding-sibling::object[@package=$currentPackage])"> <xsl:call-template name="write_header"> <xsl:with-param name="counterList" select="/extended_root/object[(@package=$currentPackage) and (not(@name=preceding-sibling::object/@name))]/@name"/> </xsl:call-template> </xsl:if> <xsl:if test="(not(preceding-sibling::object[(@package=$currentPackage) and (@instance=$currentInstance) and (@timestamp=$currentDateTime)]))"> <xsl:call-template name="write_datarecord"> <xsl:with-param name="counterList" select="/extended_root/object[(@package=$currentPackage) and (not(@name=preceding-sibling::object/@name))]/@name"/> </xsl:call-template> </xsl:if> </xsl:for-each> </xsl:template> Writing the header is performed in an acceptable amount of time, but writing the records gives a lot of problems. Does anybody has some suggestions how I could improve performance. Thanks ! Kind regards, ismael 
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