Subject: Re: [xsl] How do I build a nodeset "programmatically" for passing to another template?|
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Thu, 17 Aug 2006 11:47:53 -0400
I'm using Saxon 6.5.x (and XSL 1.1).
Searches on the web and this list's archives give me tantalizing hints that what I want to do is theoretically possible. All of the examples I find seem to be "reducers" (e.g. sum a set of numbers spread throughout a nodeset, or combine nodes into a single string), rather than "builders".
My stylesheets are pull style that build XSL-FO output for further processing by Apache-FOP. What I'm trying to do is build a nodeset in a variable so that I can rely on some generic fo:table templates to produce the output rather than custom templates for each occurrence. Due to limits of what is currently in the XML input files, I'm forced to do some calculation/nodeset building to supplement the structure already in the XML file.
Is it possible for a chunk of XSL like: <xsl:variable name="max_ay" select="/vdt:report/vdt:run_metrics/*[normalize-space(text()) = 'Avg Ay']/vdt:statistics/vdt:statistic[@stat_name='Average']"/> <xsl:variable name="ay_90pct" select="format-number(0.9 * $max_ay, '#.##')"/> <xsl:variable name="speed_table_values"> <xsl:call-template name="ml_generate_speed_table"> <xsl:with-param name="ay_target" select="$ay_90pct"/> <xsl:with-param name="radii"> <radius>30</radius> <radius>60</radius> <radius>61</radius> <radius>100</radius> </xsl:with-param> <xsl:with-param name="string_format">#.#</xsl:with-param> </xsl:call-template> </xsl:variable>
To result in the variable $speed_table_values looking something like ?: <entry> <radius>30</radius> <speed_km_h>60.9</speed_km_h> <speed_mph>50.1</speed_mph> </entry> <entry> <radius>60</radius> <speed_km_h>72.9</speed_km_h> <speed_mph>60.1</speed_mph> </entry> <entry> <radius>61</radius> <speed_km_h>81.9</speed_km_h> <speed_mph>70.4</speed_mph> </entry> <entry> <radius>100</radius> <speed_km_h>99.9</speed_km_h> <speed_mph>75.1</speed_mph> </entry>
(The numbers in the table are bogus but the nodeset structure is what I'm interested in.)
I would then have a later <xsl:call-template> that contained <xsl:with-param select="$speed_table_values">
As you can see, this particular problem is mostly interating over nodes provided within the XSL sheet itself rather than the source XML. Only the first line of my example is grabbing a value/node from the source tree. I need to accomplish this in a single pass (not multiple calls to an XSLT transformer). Assuming what I want to do is possible in XSL 1.1, any links to similar examples would be much appreciated.