It's not clear to me whether a period goes in the same group as the 
previous element if (a) its price is within £20 of the price of the 
previous period, or (b) its price is within £20 of the price of the 
first period in the group, or (c) its price is within £20 of every other 
period within the group. Assuming (c) which seems the most plausible, I 
think you need to do this by sibling recursion rather than by 
xsl:for-each-group. Here's an example of the idea, there are plenty of 
others you can find by googling:

http://internal.rhaptos.org/devblog/cbearden/2009.07.12-2010

The difference is how to test whether the next item belongs in the same 
group: typically you'll pass along parameters containing the minimum and 
maximum price of items in the group, and either add the next item to the 
group or start a new group depending how the price of the next item 
compares with these two values.

Michael Kay
Saxonica



On 13/08/2010 10:35, Kevin Bird wrote:
> Hello
>
> I typeset price tables for Tour Operators brochures. Due to design changes, the space left to display price information has been reduced. I need to group adjacent<price>  elements that are within a certain range (the range would be passed as a parameter). Once the price groupings are worked out, I then need to modify the corresponding<period>  elements.
>
> The example below shows adjacent price elements grouped that are within a range of £20 (with the lowest price returned). Using the same groupings, the<period>  elements are modified by taking the first<startdate>  and last<enddate>.
>
> I can use XSLT 2.0.
>
>
> =========================
> SOURCE XML
> =========================
>
> <?xml version="1.0" encoding="UTF-8"?>
> <grid>
> 	<row id="periods">
> 		<period>
> 			<startdate>01-Sep-2010</startdate>
> 			<enddate>19-Sep-2010</enddate>
> 		</period>
> 		<period>
> 			<startdate>20-Sep-2010</startdate>
> 			<enddate>25-Sep-2010</enddate>
> 		</period>
> 		<period>
> 			<startdate>26-Sep-2010</startdate>
> 			<enddate>30-Sep-2010</enddate>
> 		</period>
> 		<period>
> 			<startdate>01-Oct-2010</startdate>
> 			<enddate>11-Oct-2010</enddate>
> 		</period>
> 		<period>
> 			<startdate>12-Oct-2010</startdate>
> 			<enddate>31-Oct-2010</enddate>
> 		</period>
> 	</row>
> 	<row id="prices">
> 		<price>1209</price>
> 		<price>1109</price>
> 		<price>1129</price>
> 		<price>1359</price>
> 		<price>1369</price>		
> 	</row>
> </grid>
>
>
> =========================
> RESULT XML
> =========================
>
> <?xml version="1.0" encoding="UTF-8"?>
> <grid>
> 	<row id="periods">
> 		<period>
> 			<startdate>01-Sep-2010</startdate>
> 			<enddate>19-Sep-2010</enddate>
> 		</period>
> 		<period>
> 			<startdate>20-Sep-2010</startdate>
> 			<enddate>30-Sep-2010</enddate>
> 		</period>
> 		<period>
> 			<startdate>01-Oct-2010</startdate>
> 			<enddate>31-Oct-2010</enddate>
> 		</period>
> 	</row>
> 	<row id="prices">
> 		<price>1209</price>
> 		<price>1109</price>
> 		<price>1359</price>
> 	</row>
> </grid>
>
>
> Any help greatly appreciated.
>
> --
> Kevin
>
>
>
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