Re: [R] Package XML: Parse Garmin *.tcx file problems

From: Duncan Temple Lang <duncan_at_wald.ucdavis.edu>
Date: Wed, 30 Mar 2011 14:09:42 -0700

Hi Michael

 Almost certainly, the problem is that the document has a default namespace. You need to identify the namespace in the XPath query. xpathApply() endeavors to make this simple:

  xpathApply(doc2, "//x:TotalTimeSeconds", xmlValue, namespaces = "x")

I suspect that will give you back something more meaningful.

 The "x" in the query (x:TotalTimeSeconds) is mapped to x = URI in namespaces and since the URI is not specified, we use the default namespace on the root node of the document. Some documents don't have a default namespace, and then you can use the prefix on the root node corresponding to the namespace of interest.

  D

On 3/30/11 1:15 PM, Folkes, Michael wrote:
> I'm struggling with package XML to parse a Garmin file (named *.tcx).
> I wonder if it's form is incomplete, but appreciably reluctant to paste
> even a shortened version.
> The output below shows I can get nodes, but an attempt at value of a
> single node comes up empty (even though there is data there.
>
> One question: Has anybody succeeded parsing Garmin .tcx (xml) files?
> Thanks!
> Michael
> _______________________
>

>> doc2 = xmlRoot(xmlTreeParse("HR.reduced3.tcx",useInternalNodes = TRUE))
>> xpathApply(doc2, "//*", xmlName)

> [[1]]
> [1] "TrainingCenterDatabase"
>
> [[2]]
> [1] "Activities"
>
> [[3]]
> [1] "Activity"
>
> [[4]]
> [1] "Id"
>
> [[5]]
> [1] "Lap"
>
> [[6]]
> [1] "TotalTimeSeconds"
>
>
>> xpathApply(doc2, "//TotalTimeSeconds", xmlValue)

> list()
>>

>
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