R help - Jan 2009 - XML package help

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:

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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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
> 
> 
> 	[[alternative HTML version deleted]]
> 
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