[R] example - export a data frame to an XML file

Duncan Temple Lang duncan at wald.ucdavis.edu
Mon Sep 29 07:15:14 CEST 2008

Hi Zubin.

   The first thing is to send us a link to the schema that the
other application expects. That would give us a "one-to-one"
mapping; otherwise, data.frame to arbitrary XML is to vague.

   Currently, there is nothing in the XML package that would
be able to take an XML schema and write an R object to such a
structure. However, I am in the process of creating an XMLSchema
package which can read XML schema and make the description available to
R so that we can read data from an XML file corresponding to that schema
and this could be adapted in some ways to automate the creation of
XML from an R object (under certain assumptions).

  So please send us all a link to the XML schema.


zubin wrote:
> In need of exporting an XML file from R, I scrub some data in R and push 
> the data into another application requiring XML.  The data set is a very 
> straightforward data frame of stock prices- see below.  I know the 
> package XML is the one to use, but need an example or some direction on 
> where to start.  I know we need to define the schema - can this be done 
> in the R XML package?
>> "date","UYG.Open","UYG.High","UYG.Low","UYG.Close","UYG.Volume","UYG.Adjusted" 
>> "2007-02-01",71.32,71.34,71.32,71.34,200,69.23
>> "2007-02-02",72.2,72.2,72.2,72.2,200,70.06
>> "2007-02-05",71.76,71.76,71.76,71.76,5100,69.63
>> "2007-02-06",72.85,72.85,72.85,72.85,3800,70.69
>> "2007-02-07",72.85,72.85,72.85,72.85,0,70.69
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