XPath and namespace specification for XML documents with an explicit default namespace

Question

I\'m struggling to get the correct combination of an XPath expression and the namespace specification as required by package XML (argument namespaces) f

Answer 1

I think @HansHarhoff provides a very good solution.

For anybody else still searching for a solution, in my experience I think the following works more generally since a single XML document can have multiple namespaces.

doc <- xmlInternalTreeParse(xml_source)

ns <- getDefaultNamespace(doc)[[1]]$uri
names(ns)[1] <- "xmlns"

getNodeSet(doc, "//xmlns:Parameter", namespaces = ns)