Draft of station XML schema. Station message Representation of one station. Generic equipment used by all channels in a station Station ondate Station offdate. Blank value means the station is active. Station epoch. If only one epoch is included, it should be the current epoch. Past epochs can also be included. Datalogger Sensors Channel or sensor response. Includes poles and zeros and generic response. Highpass or lowpass response. Poles or zeroes. Uncertainty_type is used to express measurement errors. For example, a value of 0.3 means there is an uncertainty error of +/- 0.3.