Subject: RE: [xsl] xslt 2.0 grouping; was Dividing a list of nodes into parts of the alphabet From: "Pawson, David" <David.Pawson@xxxxxxxxxxx> Date: Fri, 3 Dec 2004 10:33:40 -0000 |
-----Original Message----- From: Michael Kay Since you're using XSLT 2.0 I would assume that you are doing the grouping using xsl:for-each-group. A useful technique here is to use a function to calculate the grouping key: <xsl:for-each-group select="item" group-by="f:grouping-key(.)"> <xsl:result-document ... </xsl:result-document> </xsl:for-each-group> <xsl:function name="f:grouping-key" as="xs:string"> <xsl:param name="item" as="element(item)"/> <xsl:variable name="ranges"> <range from="A" to="G"/> <range from="H" to="L"/> <range from="M" to "P"/> <range from="Q" to "Z"/> </xsl:variable> <xsl:sequence select="$ranges/range [string(@from) lt substring($item/artist,1,1) and string(@to) ge substring($item/artist,1,1)]/@from"/> </xsl:function> I hope this gives you some ideas about how to tackle the problem. You could of course read the table of ranges from a secondary input document to make it more flexible, or you could calculate it as a function of the input data. I found this intriguing... and not exactly clear (to me at least). Test input <?xml version="1.0" encoding="UTF-8"?> <categories> <item> <artist>Sbout the Moon</artist> <title>Carved in Stigmata Wounds</title> </item> <item> <artist>Satyricon</artist> <title>Rebel Extravaganza</title> </item> <item> <artist>Secrets of the Moon</artist> <title>Carved in Stigmata Wounds</title> </item> </categories> stylesheet: <xsl:template match="/"> <xsl:apply-templates/> </xsl:template> <xsl:template match="group"/> <xsl:template match="categories"> <xsl:for-each-group select="item" group-by="f:grouping-key(.)"> <xsl:value-of select="substring(artist,1,1)"/> </xsl:for-each-group> <xsl:apply-templates select="item"/> </xsl:template> <xsl:template match="item"> <xsl:message> <xsl:value-of select="f:grouping-key(.)[1]"/> </xsl:message> </xsl:template> <xsl:function name="f:grouping-key" as="xs:string"> <xsl:param name="item" as="element(item)"/> <xsl:variable name="ranges"> <range from="A" to="G"/> <range from="H" to="L"/> <range from="M" to= "P"/> <range from="Q" to= "Z"/> </xsl:variable> <xsl:sequence select="$ranges/range [string(@from) lt substring($item/artist,1,1) and string(@to) ge substring($item/artist,1,1)]/@from"/> </xsl:function> Comments: 1. If the item/artist are not lexically sequential it bombs. 2. I don't understand the grouping, hence the item template, which shows outptu I don't understand either. Anyone care to explain further please? TIA daveP. -- DISCLAIMER: NOTICE: The information contained in this email and any attachments is confidential and may be privileged. If you are not the intended recipient you should not use, disclose, distribute or copy any of the content of it or of any attachment; you are requested to notify the sender immediately of your receipt of the email and then to delete it and any attachments from your system. RNIB endeavours to ensure that emails and any attachments generated by its staff are free from viruses or other contaminants. However, it cannot accept any responsibility for any such which are transmitted. We therefore recommend you scan all attachments. Please note that the statements and views expressed in this email and any attachments are those of the author and do not necessarily represent those of RNIB. RNIB Registered Charity Number: 226227 Website: http://www.rnib.org.uk
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