Hello all,



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