Hi Javier,

One function you could try is ft:tokenize. the attached example


Christian

let $term := ft:tokenize('DNA')
for $sentence in <sentences>
    <sentence id="1.1.122.1.122">The translated protein showed weak DNA binding with a specificity for the kappa B binding motif.</sentence>
    <sentence id="54.1.5.1.698">Using this assay system, we have evaluated the contributions of ligand binding and heat activation to DNA binding by these glucocorticoid receptors.</sentence>
    <sentence id="2.1.17.1.79">2.5 Mesocosm DNA extraction and purification</sentence>
</sentences>/sentence
order by index-of(ft:tokenize($sentence), $term)[1]
return $sentence