I'm using Python's `xml.etree.ElementTree` to do some XML parsing on a file. However, I get this error mid-way through the document:

```
xml.parsers.expat.ExpatError: not well-formed (invalid token): line X, column Y

```

So I go to line X, column Y in vim and I see an ampersand (&) with red background highlighting. What does this mean? 

Also the two characters preceding it are `>>`, so maybe there's something special about `>>&`? 

Anyone know how to fix this?