protected void addStream(int channelNum, double leftRightPos, double frontRearPos) throws XmlContentException {
Stream stream = new Stream();
stream.setID("STREAM_"+UUID.randomUUID().toString());
stream.setFaceRegionRef(regionID);
stream.setLabel("stream "+channelNum);
ChannelAssignment channelAssignment = new ChannelAssignment();
channelAssignment.setChannelNum(channelNum);
channelAssignment.setLeftRightPosition(leftRightPos);
channelAssignment.setFrontRearPosition(frontRearPos);
stream.setChannelAssignment(channelAssignment);
region.addStream(stream);
}