Read local xml file

[KeineAhnung]

Hi,

finally I managed to download and save a xml file to my disk. Now I would like to find a specific element in this xml file. I managed to open it in QML using JS (how to) but I am just not able to access the content of the nodes. What is the right syntax to access these information from the for loop?

<xml>
 <termin type="1">
  <datum>1449939600</datum>
  <art>BA</art>
  <thema>Feier</thema>
  <anmerkung/>
 </termin>
 <termin type="2">
  <datum>1450458000</datum>
  <art>Supervision</art>
  <thema>Supervision</thema>
  <anmerkung/>
</termin>
</xml>

<xml>
 <termin type="1">
  <datum>1449939600</datum>
  <art>BA</art>
  <thema>Feier</thema>
  <anmerkung/>
 </termin>
 <termin type="2">
  <datum>1450458000</datum>
  <art>Supervision</art>
  <thema>Supervision</thema>
  <anmerkung/>
</termin>
</xml>

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For example console.log(a[ii].getElementsByTagName("datum")[0].childNodes[0].nodeValue); says TypeError: Cannot call method 'getElementsByTagName' of undefined
What am I doing wrong?