> Somehow $node = $dom->createElement("line");  needs to be inserted.

That's right.  It'd be worth taking some time to understand how your
current php code creates marker XML data, so that you can do something
similar but a little different for lines.

Before you can do that, you will need to work out exactly what line
data you want to output.  From what I can see, you'll need to test
each of your markers for some property, and if the property has some
value you want, draw a line (to where?)
You'll probably need to learn some more php for that ; this isn't a
php forum.

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