Re: [xsl] Global Variables in streaming xslts

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On 15.08.2016 17:46, Mailing Lists Mail daktapaal@xxxxxxxxx wrote:

> 1. How do we get the global Xpaths.. That can be used else where.
>
>   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

In my understand you have two options, one might be to use an 
accumulator to store the value of the other element, the other would be 
to use `copy-of()` on a common parent or ancestor and then work with 
that copy with normal template.

Both solutions depend of course on the structure of the input and the 
relation of those two elements, I am not sure where in your tree the 
Amphibian are located in relation to the WaterSpeciesDisplayIndicator 
element(s).

And of course the copy-of would pull a subtree into memory so is only 
useful in the context of streaming for closely related elements like 
siblings e.g.
  <foo>
    <bar>bar</bar>
    <baz>baz</bar>
  </foo>
with e.g.
  <xsl:template match="foo">
    <xsl:apply-templates select="copy-of()" mode="m2"/>
  </xsl:template>
  <xsl:template match="foo[bar = 'bar']/baz">
    ...
  </xsl:template>