tree = newXMLDoc()
newXMLNode("xmcda:XMCDA", 
           namespace = c("xsi" = "http://www.w3.org/2001/XMLSchema-instance", 
           "xmcda" = "http://www.decision-deck.org/2009/XMCDA-2.1.0"), 
           parent=tree)
comps <- rbind(c("x", "y", "0.07"), c("y", "z", "0.01"))
altIDs <- c("x","y","z")
putAlternativesComparisonsLabels(tree,comps, mcdaConcept="newComparisons")
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