Re: Global Variables in streaming xslts

Thanks Martin and Michael.
My conditions can be quite randomly picking nodes from trees .. so i am
going to try using the parse multiple times to populate these variables
technique...
Thanks again. A lot of learning again for me..

On Aug 15, 2016 12:46 PM, "Michael Kay mike@xxxxxxxxxxxx" <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

>
> On 15 Aug 2016, at 16:46, Mailing Lists Mail daktapaal@xxxxxxxxx <
> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Dear All..
> I have some.more questions
>
> 1. How do we get the global Xpaths.. That can be used else where.
>
>
> Basically, you can't. The code you provide isn't streamable.
>
> There may be workarounds. For example, you could process the input stream
> twice, once to extract the "lookup" information, and once to process the
> data that references it. Then you might write:
>
> <xsl:variable name="WaterSpeciesDisplayIndicator" as="xs:boolean">
>   <xsl:stream href="UniverseKingdom.xml">
>     <xsl:select="/*:UniverseKingdom/*:DisplayIndicators/*:WaterSpeciesDisplayIndicator
> = 'true'"/>
>   </xsl:stream>
> </xsl:variable>
>
> Note that (in Saxon at any rate) this will stop processing the input
> stream as soon as a qualifying element is found, so it may not be as
> expensive as processing the whole document twice.
>
> If the lookup data is at the start of the file, and always appears before
> you need it, then another approach is to use accumulators. These read data
> "in the background" as the input stream is being read:
>
> <xsl:accumulator name="indicator" as="xs:boolean" initial-value="false()">
>   <xsl:accumulator-rule match="/*:UniverseKingdom/*:DisplayIndicators/*:
> WaterSpeciesDisplayIndicator/text()[. = 'true']"
>      select="true()"/>
> </xsl:accumulator>
>
> which you can then reference as <xsl:if test="accumulator-before('
> indicator')">....
>
> Michael Kay
> Saxonica
>
>
> select="/*:UniverseKingdom/*:DisplayIndicators/*:WaterSpeciesDisplayIndicator
> = 'true'"/>
>
>   example: I want to know somewhere in some template the value of some
> other element : for example  In Amphibian template definition, I want to
> know if  WaterSpeciesDisplayIndicator is set to true :
>
>  Code:
>
>   <xsl:transform version="3.0" xmlns:xsl="http://www.w3.org/
> 1999/XSL/Transform" xmlns:saxon="http://saxon.sf.net/" xmlns:multiclass="
> http://www.csp.com/Securitization/csp-multiclass" xmlns:mismo="
> http://www.mismo.org/residential/2009/schemas">
>
>             <xsl:mode name="stream" streamable="yes"
> on-no-match="shallow-copy"/>
>
>             <xsl:output method="xml" indent="yes"/>
>
>            <xsl:variable name="WaterSpeciesDisplayIndicator"
> select="/*:UniverseKingdom/*:DisplayIndicators/*:WaterSpeciesDisplayIndicator
> = 'true'"/>
>
>
>             <xsl:template match="/">
>
>    <xsl:stream href="UniverseKingdom.xml">
>
>          <xsl:apply-templates mode="stream"/>
>                         </xsl:stream>
>             </xsl:template>
>
>
>
>             <xsl:template match="*:Amphibian">
>
>  <xsl:if test = "$WaterSpeciesDisplayIndicator"> <xsl:copy-of select =
> "."/>
> </xsl:if>
>
>             </xsl:template>
>
>             I know that GLobal parameters will not work because the
> variables probably doesnt know the XML we are streaming at the time of
> declaration. I also know that from the template match for Amphibian, I can
> not get to the xpath of /*:UniverseKingdom/*:DisplayIndicators/*:
> WaterSpeciesDisplayIndicator.
>
>            I am not sure how else I should be getting the
> WaterSpeciesDisplayIndicator Value
>
> Thanks
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