xsl:sort - how do i use it properly?

[Angus Parvis]

Hi,

I have the two XML-files economist.xml and finance.xml. Both contain
news articles which have to be transformed to be integrated into one
document.

The transformations are quite simple, you can see it in the file 2.xsl.
My problem is, that I have to sort those articles by date. That means
first by year, then by month and then by year. And I fail to apply the
xsl:sort-element properly.

So, can anyone help me with a solution or point me to some tutorial,
that tells me how to use serveral nested sort-elements?

I appreciate any help. Thanks in advance,

Angus