newb: lxml objectify

[johnny]

<Library>
<DVD id="1">
<title>Breakfast at Tiffany's</title>
<format>Movie</format>
<genre>Classic</genre>
</DVD>

<DVD id="2">
<title>Borat</title>
<format>Movie</format>
<genre>Comedy</genre>
</DVD>
</Library>

How do you represent DVD id=1 and it's elements, and DVD id=2 and it's
elements as child of root "Library"?
Like this:?

from lxml import etree
from lxml import objectify

root = objectify.Element("Library")
child[1] = objectify.Element("DVD", id="1")
root.new_child = child[1]

Thank you