Entertain code inside tips

[gregturn]

Right now, the following chunk doesn't render properly:

[NOTE]
====
Yada yada.

[source,xml]
----
<my-xml>
</my-xml>
----
====

It looks fine in HTML with the code nicely inserted inside the admonition. But in FODT, nothing is visible probably because its a text:p inside a text:p.