Guys,
I'm hoping you can help with the following problem - I have an input
file as follows:

<FlatFileSchema>
	<Line>
		<Centres>
			<CentreNo>DE614</CentreNo>
		</Centres>
		<Country>Germany</Country>
	</Line>
	<Line>
		<Centres>
			<CentreNo>DE614</CentreNo>
			<CentreNo>DE617</CentreNo>
		</Centres>
		<Country>Germany</Country>
	</Line>
	<Line>
		<Centres>
			<CentreNo>ID081</CentreNo>
		</Centres>
		<Country>Indonesia</Country>
	</Line>
	<Line>
		<Centres>
			<CentreNo>ID090</CentreNo>
			<CentreNo>ID092</CentreNo>
		</Centres>
		<Country>Indonesia</Country>
	</Line>
</FlatFileSchema>

and I want to create a grouped output file as follows:

<Grouping>
	<Country name="Germany">
		<CentreNo>DE614</CentreNo>
		<CentreNo>DE617</CentreNo>
	</Country>
	<Country name="Indonesia">
		<CentreNo>ID081</CentreNo>
		<CentreNo>ID090</CentreNo>
		<CentreNo>ID092</CentreNo>
	</Country>
</Grouping>

Can you offer any advice on the best method using XSLT 1.0
(unfortunately, I can't use 2.0 :-()

I have tried looking into Muenchian Method to perform the grouping,
but I'm getting horribly lost - any advice is greatly appreciated.

Kind regards, Nick.