OPENXML Insert/Update

Hi All,

The code (http://sqlxml.org/faqs.aspx?faq=100) below mirrors mine but is simplfied:

declare @i int

exec sp_xml_preparedocument @i output,
'<mydata>
<test xmlID="3" xmlData="blah blah blah"/>
<test xmlID="1" xmlData="blah"/>
</mydata>'

insert into test
select xmlID, xmlData
from OpenXml(@i, 'mydata/test')
with (xmlID int, xmlData nvarchar(30))
where xmlID not in (select xmlID from test)

update test
set test.xmlData = ox.xmlData
from OpenXml(@i, 'mydata/test')
with (xmlID int, xmlData nvarchar(30)) ox
where test.xmlID = ox.xmlID

exec sp_xml_removedocument @i


My question is when running this stored procedure for the first time, isn't one inserting AND then updating each row?