[XML] Is this a good XML document?

Code:

---

<?xml version="1.0" encoding="ISO-8859-1"?><asdf xmlns:edi='http://ecommerce.org/schema'><edi:blah xmlns:mnb='http://ecommerce.org/schema'>asdf<mnb:pop edi:wzzup="kaki">a</mnb:pop>sdf<hello></hello></edi:blah>asdf</asdf>

---

Is this a well-formed document? My parser won't parse it for some reason, so I just wanted to know if it was maybe me making the mistake.
The parser fails on the "edi:wzzup" attribute for some reason.
Please help!