New Input:

<articles>
     <row>
        <col>627</col>
        <col>Abstracts of the Series of Fascia Congress - Part 4</col>
        <col>270</col>
     </row>
     <row>
        <col>661</col>
        <col/>
        <col>270</col>
     </row>
     <row>
        <col>676</col>
        <col/>
        <col>271</col>
     </row>
     <row>
        <col>719</col>
        <col>Abstracts of the Series of Fascia Congress - Part 4</col>
        <col>272</col>
     </row>
     <row>
        <col>706</col>
        <col>Prevention &amp; Rehabilitation|Editorial</col>
        <col>276</col>
     </row>
     <row>
        <col>690</col>
        <col>Prevention &amp; Rehabilitation|Editorial</col>
        <col>283</col>
     </row>
     <row>
        <col>721</col>
        <col>Prevention &amp; Rehabilitation|Learning Methodology</col>
        <col>291</col>
     </row>
  </articles>

I am unable to provide two values in group-by attribute. Please
suggest how to achieve this.

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/