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Re: [xsl] Finding Only Initial Following Siblings That Meet Some Criteria

2020-02-05 17:14:56
I think the ability to select items from a sequence until some condition is 
true is something that's always been far too difficult.

In my paper for XML Prague next week I propose:

  function($n){$n/@outputclass != $this/@outputclass})

as a function that selects everything in a sequence up to, and excluding, the 
first item where some condition is true.

You could consider implementing this function using xsl:iterate:

<xsl:function name="f:items-before" as="item()*">
  <xsl:param name="in" as="item()*"/>
  <xsl:param name="predicate" as="function(item()) as xs:boolean"/>
  <xsl:iterate select="$in">
      <xsl:when test="$predicate(.)">
         <xsl:sequence select="."/>

And I've always thought a following-sibling-or-self axis would be handy, though 
the name is horrendous.

Michael Kay

On 5 Feb 2020, at 22:29, Eliot Kimber ekimber(_at_)contrext(_dot_)com 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

In my XML I can have adjacent elements that should be processed as a unit, 
where the adjacent elements all have the same value for a given attribute. 
Other elements with the same attribute could be following siblings but 
separated by other elements or text nodes, i.e.:

<p>Text <ph outputclass="x">1</ph><ph outputclass="x">2</ph> more text <ph 
outputclass="x">New sequence</ph></p>

Where the rendered result should combine the first two <ph> elements but not 
the third, i.e.:

<p>Text <x>12</x> more text <x>New sequence</x></p>

Processing is applied to the first element in the document with the 
@outputclass value "x" and then I want to grab any immediately following 
siblings with the same @outputclass value and no intervening text or element 

My solution is to use for-each-group like so:

   <xsl:variable name="this" as="element()" select="."/>
   <xsl:variable name="adjacent-sibs" as="element()+">
     <xsl:for-each-group select="($this, $this/following-sibling::node())" 
       <xsl:if test=". is $this">
         <xsl:sequence select="current-group()"/>

Which works, but I'm thinking there must be a more compact way to do the same 
selection, but the formulation is escaping me.

Is there a more compact or more efficient way to make this selection of only 
immediately-adjacent following siblings?


Eliot Kimber

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