Domain preferences are defined by the prefs node. This node is specified by the domainPrefs (plesk_domain.xsd). It is structured as follows:

The following sample packet creates a domain account and sets domain preferences:
<packet version="1.6.0.0">
<domain>
<add>
<gen_setup>
<name>example.com</name>
<owner-id>1234</owner-id>
<ip_address>192.0.2.123</ip_address>
</gen_setup>
<prefs>
<www>false</www>
<stat_ttl>6</stat_ttl>
</prefs>
</add>
</domain>
</packet>