Attributes not always included in final hash

[ArnoldMEDLINQ]

Given this simple minimal example:

<data>
  <test1 attr1="a1"/>
  <test2 attr1="a1">
    <id>myId</id>
  </test2>
  <test3 attr="a1">content</test3>
</data>

The output is:
{"data"=>{"test1"=>{"@attr1"=>"a1"}, "test2"=>{"id"=>"myId", "@attr1"=>"a1"}, "test3"=>"content"}}

The attribute of the tag test3 is missing. I believe this to be an error. Especially as many XML standards exspect this attributes to be used. E.G. the new XRechnung (en16931) declares many attributes this way. Is there a possibility to include the attributes of tags with content but without further tags inside them into the hash?