Re: [xsl] Global Variables in streaming xslts

["Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

> 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/*:WaterSpeciesDisplay
Indicator = '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
<http://www.w3.org/1999/XSL/Transform>" xmlns:saxon="http://saxon.sf.net/
<http://saxon.sf.net/>"
xmlns:multiclass="http://www.csp.com/Securitization/csp-multiclass
<http://www.csp.com/Securitization/csp-multiclass>"
xmlns:mismo="http://www.mismo.org/residential/2009/schemas
<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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