[R] XML parsing

2pol philippkynast at gmx.de
Wed Jun 29 13:12:44 CEST 2011


Hi,
i want to parse a XML-File.
I made some Tutorial but with my special Format it don't work.
An Example of my format:


<?xml version="1.0" encoding="ISO-8859-1"?>
<mzML xmlns="http://psi.hupo.org/ms/mzml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://psi.hupo.org/ms/mzml
http://psidev.info/files/ms/mzML/xsd/mzML1.1.0_idx.xsd" version="1.1">
  <cvList count="3">
    <cv id="MS" fullName="Proteomics Standards Initiative Mass Spectrometry
Ontology" version="1.3.1" URI="http://psidev.info/ms/mzML/psi-ms.obo"/>
    <cv id="UO" fullName="Unit Ontology" version="1.15"
URI="http://obo.cvs.sourceforge.net/obo/obo/ontology/phenotype/unit.obo"/>
    <cv id="IMS" fullName="Imaging MS Ontology" version="0.9.1"
URI="http://www.maldi-msi.org/download/imzml/imagingMS.obo"/>
  </cvList>
  <fileDescription>
    <fileContent>
      <cvParam cvRef="MS" accession="MS:1000579" name="MS1 spectrum"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000128" name="profile spectrum"
value=""/>
      <cvParam cvRef="IMS" accession="IMS:1000080" name="universally unique
identifier" value="{554A27FA-79D2-4766-9A2C-862E6D78B1F3}"/>
      <cvParam cvRef="IMS" accession="IMS:1000091" name="ibd SHA-1"
value="A5BE532D25997B71BE6D20C76561DDC4D5307DDD"/>
      <cvParam cvRef="IMS" accession="IMS:1000030" name="continuous"
value=""/>
    </fileContent>
    <sourceFileList count="1">
      <sourceFile id="sf1" name="Example.raw" location="C:\Users\Thorsten
Schramm\Documents\Promotion\imzML\Website\files\Beispiel-Dateien\Example
images\">
        <cvParam cvRef="MS" accession="MS:1000563" name="Thermo RAW file"
value=""/>
        <cvParam cvRef="MS" accession="MS:1000768" name="Thermo nativeID
format" value=""/>
        <cvParam cvRef="MS" accession="MS:1000569" name="SHA-1"
value="7623BE263B25FF99FDF017154B86FAB742D4BB0B"/>
      </sourceFile>
    </sourceFileList>
    <contact>
      <cvParam cvRef="MS" accession="MS:1000586" name="contact name"
value="Thorsten Schramm"/>
      <cvParam cvRef="MS" accession="MS:1000590" name="contact organization"
value="Institut für Anorganische und Analytische Chemie"/>
      <cvParam cvRef="MS" accession="MS:1000587" name="contact address"
value="Schubertstraße 60, Haus 16, Gießen, Germany"/>
      <cvParam cvRef="MS" accession="MS:1000589" name="contact email"
value="thorsten.schramm at anorg.chemie.uni-.giessen.de"/>
    </contact>
  </fileDescription>
  <referenceableParamGroupList count="4">
    <referenceableParamGroup id="mzArray">
      <cvParam cvRef="MS" accession="MS:1000576" name="no compression"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000514" name="m/z array" value=""
unitCvRef="MS" unitAccession="MS:1000040" unitName="m/z"/>
      <cvParam cvRef="IMS" accession="IMS:1000101" name="external data"
value="true"/>
      <cvParam cvRef="MS" accession="MS:1000521" name="32-bit float"
value=""/>
    </referenceableParamGroup>
    <referenceableParamGroup id="intensityArray">
      <cvParam cvRef="MS" accession="MS:1000576" name="no compression"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000515" name="intensity array"
value="" unitCvRef="MS" unitAccession="MS:1000131" unitName="number of
counts"/>
      <cvParam cvRef="IMS" accession="IMS:1000101" name="external data"
value="true"/>
      <cvParam cvRef="MS" accession="MS:1000521" name="32-bit float"
value=""/>
    </referenceableParamGroup>
    <referenceableParamGroup id="scan1">
      <cvParam cvRef="MS" accession="MS:1000093" name="increasing m/z scan"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000095" name="linear" value=""/>
      <cvParam cvRef="MS" accession="MS:1000512" name="filter string"
value="ITMS - p NSI Full ms [100,00-800,00]"/>
    </referenceableParamGroup>
    <referenceableParamGroup id="spectrum1">
      <cvParam cvRef="MS" accession="MS:1000579" name="MS1 spectrum"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000511" name="ms level" value="0"/>
      <cvParam cvRef="MS" accession="MS:1000128" name="profile spectrum"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000129" name="negative scan"
value=""/>
    </referenceableParamGroup>
  </referenceableParamGroupList>
  <sampleList count="1">
    <sample id="sample1" name="Sample1">
      <cvParam cvRef="MS" accession="MS:1000001" name="sample number"
value="1"/>
    </sample>
  </sampleList>
  <softwareList count="2">
    <software id="Xcalibur" version="2.2">
      <cvParam cvRef="MS" accession="MS:1000532" name="Xcalibur" value=""/>
    </software>
    <software id="TMC" version="1.1 beta">
      <cvParam cvRef="MS" accession="MS:1000799" name="custom unreleased
software tool" value=""/>
    </software>
  </softwareList>
  <scanSettingsList count="1">
    <scanSettings id="scansettings1">
      <cvParam cvRef="IMS" accession="IMS:1000401" name="top down"
value=""/>
      <cvParam cvRef="IMS" accession="IMS:1000413" name="flyback" value=""/>
      <cvParam cvRef="IMS" accession="IMS:1000480" name="horizontal line
scan" value=""/>
      <cvParam cvRef="IMS" accession="IMS:1000491" name="linescan left
right" value=""/>
      <cvParam cvRef="IMS" accession="IMS:1000042" name="max count of pixel
x" value="3"/>
      <cvParam cvRef="IMS" accession="IMS:1000043" name="max count of pixel
y" value="3"/>
      <cvParam cvRef="IMS" accession="IMS:1000044" name="max dimension x"
value="300" unitCvRef="UO" unitAccession="UO:0000017"
unitName="micrometer"/>
      <cvParam cvRef="IMS" accession="IMS:1000045" name="max dimension y"
value="300" unitCvRef="UO" unitAccession="UO:0000017"
unitName="micrometer"/>
      <cvParam cvRef="IMS" accession="IMS:1000046" name="pixel size x"
value="100" unitCvRef="UO" unitAccession="UO:0000017"
unitName="micrometer"/>
      <cvParam cvRef="IMS" accession="IMS:1000047" name="pixel size y"
value="100" unitCvRef="UO" unitAccession="UO:0000017"
unitName="micrometer"/>
      <cvParam cvRef="MS" accession="MS:1000836" name="dried dropplet"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000835" name="matrix solution
concentration" value="10"/>
      <cvParam cvRef="MS" accession="MS:1000834" name="matrix solution"
value="DHB"/>
    </scanSettings>
  </scanSettingsList>
  <instrumentConfigurationList count="1">
    <instrumentConfiguration id="LTQFTUltra0">
      <cvParam cvRef="MS" accession="MS:1000557" name="LTQ FT Ultra"
value=""/>
      <cvParam cvRef="MS" accession="MS:1000529" name="instrument serial
number" value="none"/>
      <componentList count="3">
        <source order="1">
          <cvParam cvRef="MS" accession="MS:1000073" name="electrospray
ionization" value=""/>
          <cvParam cvRef="MS" accession="MS:1000485" name="nanospray inlet"
value=""/>
          <cvParam cvRef="MS" accession="MS:1000843" name="wavelength"
value="337"/>
          <cvParam cvRef="MS" accession="MS:1000844" name="focus diameter x"
value="10"/>
          <cvParam cvRef="MS" accession="MS:1000845" name="focus diameter y"
value="10"/>
          <cvParam cvRef="MS" accession="MS:1000846" name="pulse energy"
value="10"/>
          <cvParam cvRef="MS" accession="MS:1000847" name="pulse duration"
value="10"/>
          <cvParam cvRef="MS" accession="MS:1000848" name="attenuation"
value="50"/>
          <cvParam cvRef="MS" accession="MS:1000850" name="gas laser"
value=""/>
          <cvParam cvRef="IMS" accession="IMS:1000202" name="target
material" value="Conductive Glas"/>
        </source>
        <analyzer order="2">
          <cvParam cvRef="MS" accession="MS:1000264" name="ion trap"
value=""/>
          <cvParam cvRef="MS" accession="MS:1000014" name="accuracy"
value="0" unitCvRef="MS" unitAccession="MS:1000040" unitName="m/z"/>
        </analyzer>
        <detector order="3">
          <cvParam cvRef="MS" accession="MS:1000253" name="electron
multiplier" value=""/>
          <cvParam cvRef="MS" accession="MS:1000120" name="transient
recorder" value=""/>
        </detector>
      </componentList>
      <softwareRef ref="Xcalibur"/>
    </instrumentConfiguration>
  </instrumentConfigurationList>
  <dataProcessingList count="2">
    <dataProcessing id="XcaliburProcessing">
      <processingMethod order="1" softwareRef="Xcalibur">
        <cvParam cvRef="MS" accession="MS:1000594" name="low intensity data
point removal" value=""/>
      </processingMethod>
    </dataProcessing>
    <dataProcessing id="TMCConversion">
      <processingMethod order="2" softwareRef="TMC">
        <cvParam cvRef="MS" accession="MS:1000544" name="Conversion to mzML"
value=""/>
      </processingMethod>
    </dataProcessing>
  </dataProcessingList>
  <run defaultInstrumentConfigurationRef="LTQFTUltra0"
defaultSourceFileRef="sf1" id="Experiment01" sampleRef="sample1"
startTimeStamp="2009-08-11T15:59:44">
    <spectrumList count="9" defaultDataProcessingRef="XcaliburProcessing">
      <spectrum id="Scan=1" defaultArrayLength="0" index="0">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="1"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="1"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="33612"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=2" defaultArrayLength="0" index="1">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="2"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="1"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="67208"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=3" defaultArrayLength="0" index="2">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="3"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="1"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="100804"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=4" defaultArrayLength="0" index="3">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="1"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="2"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="134400"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=5" defaultArrayLength="0" index="4">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="2"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="2"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="167996"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=6" defaultArrayLength="0" index="5">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="3"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="2"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="201592"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=7" defaultArrayLength="0" index="6">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="1"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="3"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="235188"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=8" defaultArrayLength="0" index="7">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="2"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="3"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="268784"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
      <spectrum id="Scan=9" defaultArrayLength="0" index="8">
        <referenceableParamGroupRef ref="spectrum1"/>
        <scanList count="1">
          <cvParam cvRef="MS" accession="MS:1000795" name="no combination"
value=""/>
          <scan instrumentConfigurationRef="LTQFTUltra0">
            <referenceableParamGroupRef ref="scan1"/>
            <cvParam cvRef="IMS" accession="IMS:1000050" name="position x"
value="3"/>
            <cvParam cvRef="IMS" accession="IMS:1000051" name="position y"
value="3"/>
          </scan>
        </scanList>
        <binaryDataArrayList count="2">
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="mzArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="16"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
          <binaryDataArray encodedLength="0">
            <referenceableParamGroupRef ref="intensityArray"/>
            <cvParam cvRef="IMS" accession="IMS:1000103" name="external
array length" value="8399"/>
            <cvParam cvRef="IMS" accession="IMS:1000102" name="external
offset" value="302380"/>
            <cvParam cvRef="IMS" accession="IMS:1000104" name="external
encoded length" value="33596"/>
            <binary/>
          </binaryDataArray>
        </binaryDataArrayList>
      </spectrum>
    </spectrumList>
  </run>
</mzML>

I want following Information:
from mzML/run/spectrumList the "count"-value.
I try this like this:

>root <- xmlTreeParse("Example_Continuous.imzML",useInternal = TRUE)
>spectrumList <-getNodeSet(root,"//spectrumList")
>sapply(spectrumList,xmlGetAttr,"count")
list()

Here I get List and no value, because the node spectrumList is empty.
Are there some methods for confortable navigating in the tree, like:
getChildrenByName.

Thanks in advance





--
View this message in context: http://r.789695.n4.nabble.com/XML-parsing-tp3632544p3632544.html
Sent from the R help mailing list archive at Nabble.com.



More information about the R-help mailing list