src/soap/templates/getPositionInfo.xml
<s:Envelope xmlns:s='http://schemas.xmlsoap.org/soap/envelope/'
s:encodingStyle='http://schemas.xmlsoap.org/soap/encoding/'>
<s:Body>
<u:GetPositionInfo xmlns:u='urn:schemas-upnp-org:service:AVTransport:1'>
<InstanceID>0</InstanceID>
</u:GetPositionInfo>
</s:Body>
</s:Envelope>