Citations are strange beasts:
  input: |
    bq.:http://textpattern.com/ Code is pottery.

    ??:http://textpattern.com Code is pottery.??

    Please, add visual feedback to link _:active_ and _:hover_ events

    Please, add visual feedback to link _:active active_ and _:hover hover_ events

    Please, add visual feedback to link _(c)[en]:active :active_ and _:hover :hover_ events

  expect: |
    <blockquote cite="http://textpattern.com/">
    	<p>Code is pottery.</p>
    </blockquote>

    <p><cite cite="http://textpattern.com">Code is pottery.</cite></p>

    <p>Please, add visual feedback to link <em>:active</em> and <em>:hover</em> events</p>

    <p>Please, add visual feedback to link <em cite="active">active</em> and <em cite="hover">hover</em> events</p>

    <p>Please, add visual feedback to link <em cite="active" class="c" lang="en">:active</em> and <em cite="hover">:hover</em> events</p>