I believe the xmltext example was mangled during the blog posting process<p><pre><code> SELECT xmltext('<Hello & World>');
xmltext
--------------------------
<Привет & Мир>
</code></pre>
Also, in case anyone missed it, their Internals book is awesome: <a href="https://postgrespro.com/community/books/internals" rel="nofollow">https://postgrespro.com/community/books/internals</a> (<a href="https://news.ycombinator.com/item?id=32088316">https://news.ycombinator.com/item?id=32088316</a> and <a href="https://news.ycombinator.com/item?id=32593996">https://news.ycombinator.com/item?id=32593996</a> were the majority of the commentary at the time)