<xs:element name="sessions" type="sessions_type" minOccurs="0" />
<xs:element name="session" type="session_type" minOccurs="0" />
<xs:element name="snapshot_action" type="snapshot_action_type" minOccurs="0" />
+ <xs:element name="snapshot" type="snapshot_type" minOccurs="0" />
<xs:element name="version" type="version_type" minOccurs="0" />
<xs:element name="save" type="save_type" minOccurs="0" />
<xs:element name="load" type="load_type" minOccurs="0" />