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Re: [xsl] question on EXSLT data partitioning

2010-10-19 10:33:32

What's wrong with

<xsl:variable name="Entities" select="child::Entity"/>
<xsl:for-each select="1 to (count($Entities) idiv $PARTITION_SIZE">
<partition>
<xsl:copy-of select="subsequence($Entities, (1 + (. - 1) * $PARTITION_SIZE), $PARTITION_SIZE)"/>
</partition>
</xsl:for-each>

Or does the mention of EXSLT mean you need a 1.0 solution?

And why exactly is a recursive solution considered unsuitable for the task? (Is it because you need to run this on processors that don't optimize tail calls?)

Michael Kay
Saxonica

Hello,

yesterday I was asked by a colleague on data partitioning.
He wanted to partition 100000s of Entities in blocks of 1000
for sending a single Database update for 1000 entities.

Below is the simplified input, partition size is N=3 and the
requested output. Below that is the solution I provided.

Here are my questions:
* can this task be done without recursion in EXSLT?
   [the colleage did not like the idea of doing the partitioning with
    just XPath (1<=position()<=1000, 1001<=position()<=2000, ...)
    because of the 6 digit number of entities]
* is the conversion of Entity to argument by apply-templates
   the way to go?



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