Inconsistent naming of XML nodes with and w/out attributes

[rimutaka]

XML elements can be defined in its XML schema as optional. Usually, a missing XML attribute is assigned a NULL value at de-serialization. Consider these 2 examples:

1. <a attr1="val1">some text</a>
2. <a>some text</a>

which should both deserialize to some struct called a with a member for the text node. However, they are converted differently:

1. {"a":{"text":"some text","attr1":"val1"}}
2. {"a":"some text"} when a more appropriate output would be `{"a":{"text":"some text"}}

This is somewhat similar to issue #6 and can probably be solved through a config option to force some simple XML nodes into an object form of JSON.