Re: [xsl] Connecting the Source and Destination fields

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

At 09:11 AM 8/29/2007, you wrote:
> This seems to be a use-case for the in another thread mentioned so-called
> "micro-pipelining". First process the input data to make them fit your
> needs, then do whatever you want with the cleaned up data.

Actually, "micro-pipelining" is what we call it when you pre-process 
only a chunk of your input in an ad-hoc fashion, in the course of 
transforming the whole of it.

If you process a document and then process it again, even if most of 
the first pass is an identity transformation, that's just pipelining.

The difference can be seen by comparing two instances:

Pipelining:

<xsl:variable name="temp">
  <xsl:apply-templates mode="first"/>
</xsl:variable>

<xsl:template match="/">
  <xsl:apply-templates select="$temp" mode="second"/>
</xsl:template>

Micro-pipelining:

<xsl:template match="div">
  <xsl:variable name="temp">
    <xsl:apply-templates mode="temp"/>
  </xsl:variable>
  <xsl:apply-templates select="$temp"/>
</xsl:template>

In the pipelining example, the entire document is processed in 
"first" mode, and the result is processed again in "second" mode (by 
the template matching the document element). In the micro-pipelining 
example, only the children (and perhaps descendants) of the div are 
processed in "temp" mode, and then the results are processed.

So in the micro-pipelining example, the pipeline is scoped to the div.

This can be useful even at very low levels of the document, and can 
spare you having to run an entire pipeline when most of the document 
doesn't require it.

Cheers,
Wendell



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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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