Subject: Re: [xsl] with XPath 1.0, select all following sibling elements of name "foo" up to the first non-"foo" element From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 18 Feb 2021 21:35:12 -0000 |
> I am facing an XPath problem The answers so far have answered the question asked, but I wonder if that is the wrong question. To select the consecutive sequence of foo elements in xpath 1 requires some kind of double pass over the list and quadratic behaviour in the number of elements in the list. However if (as appears the case) the question is in an XSLT context rather than pure Xpath, you can usually avoid selecting the elements in a single expression. this does a single pass over the list stopping at the first non-foo element so is linear complexity xpath is just used to select one element at a time, the logic of handling just foo elements is pushed to a specific XSLT mode that only handles foo and stops at anything else, Given <x> <b> <foo>1</foo> <foo>2</foo> <bar>x</bar> <foo>3</foo> </b> <b> <foo>4</foo> <foo>5</foo> <foo>6</foo> </b> <b> <bar>y</bar> <foo>7</foo> <foo>8</foo> </b> </x> this stylesheet <xsl:stylesheet version="1.0" xmlns:xsl=" http://www.w3.org/1999/XSL/Transform"> <xsl:template match="b"> <zzz> <xsl:apply-templates mode="onlyfoo" select="*[1]"/> </zzz> </xsl:template> <xsl:template mode="onlyfoo" match="*"/> <xsl:template mode="onlyfoo" match="foo"> <xsl:copy-of select="."/> <xsl:apply-templates mode="onlyfoo" select="following-sibling::*[1]"/> </xsl:template> </xsl:stylesheet> produces <zzz><foo>1</foo><foo>2</foo></zzz> <zzz><foo>4</foo><foo>5</foo><foo>6</foo></zzz> <zzz/>
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