RE: Data Structure Stack

You have to remember that all values in the XPath 2.0 data model are
immutable, and this sometimes means that a different choice of algorithm is
appropriate. 

You can certainly implement a stack in XSLT 2.0:

<xsl:function name="stack:push" as="item()*>
  <xsl:param name="stack" as="item()*"/>
  <xsl:param name="item" as="item()"/>
  <xsl:sequence select="$stack, $item"/>
</xsl:function>

<xsl:function name="stack:pop" as="item()">
  <xsl:param name="stack" as="item()*"/>
  <xsl:param name="item" as="item()"/>
  <xsl:sequence select="if (empty($stack))
                        then error(...)
                        else $stack[position() != last()]"/>
</xsl:function>

P.S. General XSLT coding questions that are not specific to the Saxon
product are better raised on the xsl-list at mulberrytech.com

Michael Kay
http://www.saxonica.com/


> -----Original Message-----
> From: saxon-help-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@xxxxxxxxxxxxxxxx 
> [mailto:saxon-help-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@xxxxxxxxxxxxxxxx] 
> On Behalf Of 
> Arthur Maloney
> Sent: 23 June 2005 16:16
> To: saxon-help-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@xxxxxxxxxxxxxxxx
> Subject: [saxon] Data Structure Stack
> 
> Hello saxon-help,
> 
>   Stack - Well known data structure Last in First out (like a 
> stack of dishes at a buffet table)
> 
>   Is this doable in Xslt2/XPath2
> 
>   consider SQL SELECT [firstName], [lastName] FROM Names
> 
>   push and pop [  ] and other code building constructs.
>   
> 
> -- 
> Best regards,
>  Arthur                          
> mailto:ArthurM-1x2qwuXUxR3QT0dZR+AlfA@xxxxxxxxxxxxxxxx
> 
> 
> 
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