[xsl] transforming something with a namespace

["Sam Carleton" <scarleton@xxxxxxxxxxxxxxxx>]

I know this is a dumb question, but how do you transform XML that has
a namespace?

Here is the XML:

<EventData xmlns="urn://www.photoparata.com/events.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>

I tried adding xmlns="urn://www.photoparata.com/events.xsd" to the
root element of the XSLT, but that did not work.

Sam