XML XPATH Select distinct elements

Hi Experts,

How do I select (using C# System.XML) the distinct categories using XPATH into an array?

I am thinking that something along the following line should do the trick, however I ain't having much luck:

xmlNodes = xmlDoc.SelectNodes("//MACHINES/CAR/CATEGORY[not(CATEGORY/text()=preceding::node/text())]/text()");

Thanks,
j.
<MACHINES>
    <CAR name='Toyota'>    
       <DATA>Some Data</DATA>
       <CATEGORY>JPY</CATEGORY>
    </CAR>
    <CAR name='Audi'>    
       <CATEGORY>ITL</CATEGORY>
    </CAR>
    <CAR name='Mazda'>    
       <CATEGORY>UK</CATEGORY>
    </CAR>
    <CAR name='Nissan'>    
       <CATEGORY>ITL</CATEGORY>
    </CAR>
   <CAR name='Nissan'>    
       <CATEGORY>ITL</CATEGORY>
    </CAR>
   <CAR name='Nissan'>    
       <CATEGORY>UK</CATEGORY>
    </CAR>
</MACHINES>

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XPUSRAsked:
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Gertone (Geert Bormans)Information ArchitectCommented:
you are close
//MACHINES/CAR[not(CATEGORY = preceding-sibling::CAR/CATEGORY)]/CATEGORY

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XPUSRAuthor Commented:
Perfect. Thanks, j.
Gertone (Geert Bormans)Information ArchitectCommented:
welcome
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