My question is:
Is there a function that can get the sub-node according to the sub-node's
attribute ?
like that,in the mtcar.xml ,there is sub-node as follow:
<record id="Lotus Europa"> 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5
2</record>
I want to get the specific sub-node according to the attribute "id="Lotus
Europa".
Is there a simple function in the xml package?
Just use xpathSApply with brackets to specify the specific id...
doc <- xmlParse(system.file("exampleData", "mtcars.xml", package="XML"))
xpathSApply(doc, "//record[@id='Lotus Europa']", xmlValue)
[1] " 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2"
#OR?
xpathSApply(doc, "//record[@id='Lotus Europa']")
getNodeSet(doc, "//record[@id='Lotus Europa']")
# And to list all Ids...
xpathSApply(doc, "//record", xmlGetAttr, "id")
[1] "Mazda RX4" "Mazda RX4 Wag" "Datsun 710" .....
--
Chris Stubben
Los Alamos National Lab
Bioscience Division
MS M888
Los Alamos, NM 87545
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