[R] XML package help

Duncan Temple Lang
Sat, 24 Jan 2009 00:48:01 -0000

Skewes,Aaron wrote:
> Please consider this:
>
> <Manifest
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
> <!-- eName       : name of the element.
>       eValue       : value of the element. -->
>
>         <OutputFilePath>./XYZ</OutputFilePath>
>         <FilesList>
>                 <File>
>                         <FileTypeId>10</FileTypeId>
>                         <FilePath>./XYZ/</FilePath>
>                         <PatientCharacteristics eName="one"
eValue="1"/>
>                         <PatientCharacteristics eName="two"
eValue="2"/>
>                         <PatientCharacteristics eName="three"
eValue="3"/>
>                 </File>
> </FilesList>
> </Manifest>
>
> I am attempting to use XML package and xpathSApply() to extract, say, the
eValue attribute for eName=='0ne' for all <File> nodes that have
<FileTypeId>==10.  I try the following, amoung several things:
>


  getNodeSet(doc,
"//File[FileTypeId/text()='10']/PatientCharacteristics[@eName='one']/@eValue")


should do it.
You need to compare the text() of the FileTypeId node.
And the / after the PatientCharacterstics and before the [] will cause
trouble.


HTH,

   D.


> doc<-xmlInternalTreeParse(Manifest)
> Root = xmlRoot(doc)
> xpathSApply(Root,
"//File[FileTypeId=10]/PatientCharacteristics/[@eName='one']",
xmlAttrs)
>
> and it does not work.
>
> Might somebody help me with the syntax here?
>
> Thanks a lot!!
> Aaron
>
>
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>
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