Python - What does my XML contain?

I'm new to this whole Python-universe, but have decided to start out by learning how to handle open data-formats, primarily XML for starters.

I have encountered a problem where I cannot figure out how I get an overview of a parsed .XML-file.

The example I'm following would have me do this:

from xml.etree.ElementTree import parse
    doc = parse('rt22.xml')

    for bus in doc.findall('bus'):

This means parsing the .XML I have written myself, and then, in this example, start looking for an element with a certain name.

The example knows that there's something called "bus" in the XML-file, but now that I've found and parsed my own XML-file, I don't know what it contains.

If I just open it with a texteditor, I get to see this:

<TilOgFraflytninger>
  <row>
    <TilOgFraflytningId>1</TilOgFraflytningId>
    <LejemaalId>1</LejemaalId>
    <AfdId>1</AfdId>
    <SelId>1</SelId>
    <TilFlyttet>1954-08-01T00:00:00</TilFlyttet>
    <FraFlyttet>2010-05-15T00:00:00</FraFlyttet>
  </row>
  <row>
    <TilOgFraflytningId>2</TilOgFraflytningId>
    <LejemaalId>1</LejemaalId>
    <AfdId>1</AfdId>
    <SelId>1</SelId>
    <TilFlyttet>2010-06-15T00:00:00</TilFlyttet>
    <FraFlyttet>2013-11-28T00:00:00</FraFlyttet>
  </row>

But how would I get that information (that something is called "AfdId" etc.) without having to open the XML in a text editor?