SSML - example of loudness and breaks

<?xml version="1.0" encoding="utf-8"?>
<speak version='1.1" xmlns="http://www.w3.org/2001/10/synthesis"
                     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                     xsi:schemaLocation="http://www.w3.org/TR/speech-synthesis11/synthesis.xsd>
 <prosody volume="loud">
  Dobré ráno. <break />
 <prosody>
 <prosody volume="default">
  Jak se máte?
 </prosody>
</speak>