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You could use the XML package to modify the attributes of a given node. > library(XML) # make an reproducible example > z <- newXMLNode("BLABLA", + attrs = c(version = "XXX"), + .children = list( + newXMLNode("A1", + attrs = c(X1=2, X2="0", X3 = "100")), + newXMLNode("A2", + attrs = c(X1=133.708, X2=36.28558)), + newXMLNode("A3", + attrs = c(X1=1, X2 = 2, X3 = 3, X4 = 4)) + )) > z <BLABLA version="XXX"> <A1 X1="2" X2="0" X3="100"/> <A2 X1="133.708" X2="36.28558"/> <A3 X1="1" X2="2" X3="3" X4="4"/> </BLABLA> # XML child nodes can be access using like a list # z[['A1']] will extract the first node with that name # then use the XML::xmlAttrs() function to get and set the attributes > a1_atts <- xmlAttrs(z[["A1"]]) > a1_atts X1 X2 X3 "2" "0" "100" > a1_atts[['X3']] <- "boo" > xmlAttrs(z[["A1"]]) <- a1_atts > z <BLABLA version="XXX"> <A1 X1="2" X2="0" X3="boo"/> <A2 X1="133.708" X2="36.28558"/> <A3 X1="1" X2="2" X3="3" X4="4"/> </BLABLA> Is that what you want to do? Cheers, Ben On Aug 13, 2015, at 8:51 AM, Robert U <tacsun...@yahoo.fr> wrote: > Dear RUser,I’m tryingto operate some very slight editing to the values of an > XML file. I looked abit everywhere and it appears that dealing with XML files > is not that easy… besidemy XML files might be a bit weirdly structured. > Anyway, let me give you an exampleof it : > Root(xmlfile)<BLABLA version="XXX"> <A1 X1="2" X2="0"X3="100"> <A2 > X1="133.708" X2="36.28558"/> <A3 X1="0" X2="0" X3="0" X4="0"/> <A4 > mode="0"/> … ……… </ A1 ></ BLABLA > I’d like to modify the value of > say,X1 in A1 line, or X1 in A2 line. Unfortunately the structure of this > datasetdoes not really look like the examples I’ve seen on the internet, > where youhave something that look like that : <A1> something to change </A1> > In my case as you noticed, thevalues I want to edit are inside de <>, which > is pretty odd… Any tips? Regards > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. Ben Tupper Bigelow Laboratory for Ocean Sciences 60 Bigelow Drive, P.O. Box 380 East Boothbay, Maine 04544 http://www.bigelow.org ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.