xml - xpath of two attributes -

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i have following xml file here

i'm trying out xpath: 

//skos:concept[@rdf:about="http://aims.fao.org/aos/agrovoc/c_7776"]/skos:preflabel[@xml:lang='en']

in order value timber trees, however, don't value. if omit xml:lang='en', i'm getting values that's not wanted data. wrong xpath?


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