无法使用Java和JAXB解组奇怪的XML格式

I need to retrieve financial data using the Open Financial Exchange (OFX) protocol. In order to do this, I am using JAXB to marshal an object tree into an XML string that specifies data request parameters, and then I am sending this XML string to a bank's server. The bank then responds with an XML string containing the requested data, which I unmarshal into an object tree using JAXB. For the first couple of banks I tried, I received the data back in well-formed XML that conformed to the published OFX schema, and I was able to unmarshal it easily using JAXB. I need to retrieve financial data using the Ope