require 'rexml/document' 
include REXML                  
file = DATA.read    
doc = Document.new(file)

aTime = Array.new
aDuration = Array.new
aComments = Array.new

doc.elements.each("PremiereData/Marker/Time") { |node| aTime  << node } 
doc.elements.each("PremiereData/Marker/Comments") { |node| aDuration  << node } 
doc.elements.each("PremiereData/Marker/Duration") { |node| aComments << node } 

aTime.each { |e| puts e.get_text }
aDuration.each { |e| puts e.get_text }
aComments.each { |e| puts e.get_text }


__END__
<PremiereData>
<Marker ObjectID="58" ClassID="...." Version="2">
  <Name>some node</Name>
  <Node Version="1">
  </Node>
  <Time>3810240000000</Time>
  <Comments>1st Point</Comments>
  <Duration>10160640000</Duration>
</Marker>
</PremiereData>