javascript - Access to a text node? -

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i want access textnode (passengers here) can't. i'm using javascript , xmldoc. have null , undefined error

this xml file :

<functionalinstance>     <id value="100177" type="humaninstance">       <mandatory>         <externalid type="string">passenger.1</externalid>         <relation ownerreference="100171" reference="100172"/>

this function : 

function collectid() {     for(var = 0; < acteurs.length; i++) {      var actortag =xmldoc.getelementsbytagname("functionalinstance")[0].childnodes[i].getelementsbytagname["mandatory"].childnodes[0].nodevalue;      alert(actortag);     } }

thank help


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