r - Accessing children elements of XML -

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i have xml document

require(xml) url <- "http://stats.oecd.org/restsdmx/sdmx.ashx/getdata/sna_table1/nor+can+fra+deu+gbr+usa+ita+jap.b1_ga+b1g_p119+b1g+b1gva+b1gvb_e+b1gvc+b1gvf+b1gvg_i+b1gvj+b1gvk+b1gvl+b1gvm_n+b1gvo_q+b1gvr_u+d21_d31+d21s1+d31s1+db1_ga.cxc/all?starttime=1950&endtime=2013" xml <- xmlparse(url)

which trying access.

i can access root element 

getnodeset(xml, "//message:messagegroup")

but can't descend 3 parse elements dataset/series. 

getnodeset(xml, "//message:messagegroup/dataset/series")

returns empty list. problem namespace of document?

yes. problem default namespace. need give name in order able select nodes it. can this

xml <- xmlparse(url) ns<-xmlnamespacedefinitions(xml, simplify=t) names(ns)[1] <- "def"   #assign name "def"

then can do

getnodeset(xml, "//message:messagegroup/def:dataset/def:series", namespaces=ns)

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