...
foo => {
    name => "Jenda",
    address => 'Jenda@Krynicky.cz',
    bar => {_content => 'hello'},
    ban => {_content => 'hi'},
  },

##</code><code>##

<foo address="Jenda@Krynicky.cz" name="Jenda"><ban>hi</ban><bar>hello</bar></foo>

##</code><code>##

...
foo => {
    name => "Jenda",
    address => 'Jenda@Krynicky.cz',
    _content => [
      "\n  ",
      [bar => {_content => 'hello'}],
      "\n  ",
      [ban => {_content => 'hi'}],
      "\n"
    ],
  },

##</code><code>##

<foo address="Jenda@Krynicky.cz" name="Jenda">
  <bar>hello</bar>
  <ban>hi</ban>
</foo>

##</code><code>##

foo => {
  name => 'Jenda',
  sibling => ['Pavel', 'Martin', 'Hana'],
}

##</code><code>##

<foo name="Jenda"><sibling>Pavel</sibling><sibling>Martin</sibling><sibling>Hana</sibling></foo>