<foo>
<!-- test undeclared tag under content only nodes -->
<bar><i_should_be_content/></bar>
<bar2><i_should_be_content/></bar2>
<bar3><i_should_be_content/></bar3>
<!-- test declared tags under content only nodes -->
<bar><jack/></bar>
<bar2><jack/></bar2>
<bar3><jack/></bar3>
<!-- test not empty tag when declared as EMPTY -->
<bar3>I should be empty</bar3>
<!-- mixed content test -->
<bar4><bar2/></bar4>
</foo>