XML : How to find string between to strings with navision 2009

I want to find a value between the node: 6777

So the value: 6777. But this is a variable node. So tha value can be every time different. But the node is alwys:

This is the code for reading the xml file:

  // The import function in NAV cant handle with the xmlns line in the xml file. So a work around is to strip the line with the  //xmlns in it.  dFile.TEXTMODE(FALSE);  dFile.OPEN(Filename);  dFile.CREATEINSTREAM(Stream);  InputText.READ(Stream);  dFile.CLOSE;     duplicateChambreofCommerce.SETRANGE("Chamber of Commerce no.",duplicateChambreofCommerce."Chamber of Commerce no.");   IF duplicateChambreofCommerce.FINDFIRST THEN      ERROR('nummer bestaat al');      TextToFind :=' xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"';  TextPos := InputText.TEXTPOS(TextToFind);  TextToFindKVKBegin :='<Kvk>';  TextToFindKVKEnd := '</Kvk>';            WHILE TextPos <> 0 DO BEGIN    InputText.GETSUBTEXT(SubText, 1, TextPos - 1);    OutputText.ADDTEXT(SubText);      InputText.GETSUBTEXT(InputText, TextPos + STRLEN(TextToFind));    TextPos := InputText.TEXTPOS(TextToFind);    END;  OutputText.ADDTEXT(InputText);       dFile.TEXTMODE(FALSE);  dFile.CREATE(Filename);  dFile.CREATEOUTSTREAM(NVOutStream);  OutputText.WRITE(NVOutStream);  dFile.CLOSE;  //Begin load node kvk:  IF ISCLEAR(XMLDoc) THEN    CREATE(XMLDoc);    XMLDoc.load(oStream);    IF NodeListExists(XMLDoc,Node,'/') THEN    LoadNodeListAndNode(XMLDoc,NodeList,Node,'/')  ELSE    ERROR('No child nodes');    IF GetNodeText(Node,'<Kvk>') = '6777' THEN;  //end node kvk        IF ISSERVICETIER THEN BEGIN    IF UPLOADINTOSTREAM(                        'Select the simple.xml file',                        '\\svdh04\data\NAV docs\webaanmelding\',                        'XML File *.xml| *.xml',                         Filename,                         Stream) THEN      MESSAGE(ImportCompleteText)    ELSE      EXIT;  END  ELSE BEGIN    dFile.OPEN(Filename);    dFile.CREATEINSTREAM(Stream);    IF NOT XMLPORT.IMPORT(50010,Stream) THEN MESSAGE(ErrorText)    ELSE MESSAGE(ImportCompleteText);  END;    IF NOT ISSERVICETIER THEN dFile.CLOSE;    

I have a string like this:

2578723 or this: 257843 or this: 22123

So the number changes every time in the string: [number]

So how to filter the number in the string:[number]?

Thank you