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From: Stanimir Stamenkov <s7an10@netscape.net>
Newsgroups: comp.lang.java.programmer
Subject: Re: XML
Date: Wed, 10 Aug 2016 22:05:32 +0300
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Wed, 10 Aug 2016 10:39:27 -0700 (PDT), Eric Douglas:
> On Tuesday, August 9, 2016 at 4:57:31 PM UTC-4, Stanimir Stamenkov 
> wrote:
>> @XmlRootElement(name = "DataRecord")
>> @XmlSeeAlso(Customer.class)
>> class DataRecord {
> I left the tags off the DataRecord and made it abstract, still 
> works fine.
>
> I tried just making DataRecord an interface, which is technically 
> what it should be, and it threw an error on the 
> JAXBContext.newInstance().
> "DataRecord is an interface, and JAXB can't handle interfaces."

It seems to me you're trying to make stuff unnecessary complicated. 
I'm not really sure why you need the base class, and you may find 
most binding frameworks have many limitations in this regard.  In 
this particular instance I'm not sure why you need (possibly) 
different derived types mapped to the same XML element type 
"DataRecord" as in:

<DataFile>
     <DataRecord>...</DataRecord>
     <DataRecord>...</DataRecord>
</DataFile>

If the two different instances of "DataRecord" map to two different 
types, then the only way to resolve this is the XML Schema 
'xsi:type' attribute – the Unmarshaller would use it to instantiate 
object of the necessary type.

As a final word, you may notice in XML an element name is generally 
used to define a single element type (if you're familiar with the 
XML DTD).  It is the much more complex XML Schema which allows you 
do other "fancy" stuff at the expense of added meta information to 
the instance document like 'xsi:type' attributes.  You need to 
design wisely both of the XML representation and Java classes bound 
to it.  Good luck in this effort.

-- 
Stanimir