SimpleTimeseries This version has been modified by Arnold Rots and John Brewer. It contains a redesign of the space and time metadata, consistent in terminology and structure with IVOA standards. Like the first version it attempts only to store simple astronomical timeseries which consist of timestamp and 0 or more data values associated with that timestamp. At this time, those values can be: Position (in 2 dimensions, icrs or galactic, with errors) Magnitude (with errors) Flux (with errors) Doubles (with errors) Strings (with numeric codes) TimeFrame defines timescale, reference position time zero point, and folding info. SapceFrame defines the spactial reference frame and spatial reference position. This is only required if position information is recorded in the data. Since it is not possible to require that the SpaceFrame exist whenever you include position data, parsers should assume the following defaults: SpaceRefFrame = ICRS ReferencePosition = GEOCENTER This optional elemnt allows global time-related defaults (errors, integration times, resolution) to be set. This optional element allows global position-related dfaults (errors, resolution) to be set. Expanded to allow setting units for uncertainty which differ from the units used for the time value. For instance, the timestamp could be measured in days with the uncertainty in milliseconds Like the uncertainty, the units of resolution may be different than the units of the timestamp. The default integration time and its associated units which may be different than the units of the timestamp. The position within the integration time of the timestamp. Limited to the values 'begin','end','midpoint' Expanded to allow setting units for position errors which differ from the units used for the position value. Position is always in decimal degrees, but the error could be in milli-arcseconds. Default value for the optional 'size' attribute of the position value. Using the 'unit' attribute, it is also possible to set the units of size if they differ from the units of position. Default value for the optional 'resolution' attribute of the position value. Using the 'unit' attribute, it is also possible to set the units of resolution if they differ from the units of position. Expanded to allow setting units for position errors which differ from the units used for the position value. Position is always in decimal degrees, but the error could be in milli-arcseconds. Default value for the optional 'size' attribute of the position value. Using the 'unit' attribute, it is also possible to set the units of size if they differ from the units of position. Default value for the optional 'resolution' attribute of the position value. Using the 'unit' attribute, it is also possible to set the units of resolution if they differ from the units of position. Allows the document creator to define a document order for the series elements separate from the traditional time ordering (which most processors and stylesheets will use to order the series elements). URI's can be attached to series elements to reference original event data. This would allow, for instance, a simpletimeseries of VOEvents to be specified with their timestamps and optionally with their data. Flux values differ from Magnitudes only in the direction of increasing brightness. Larger values of MAG refer to lower brightness. Larger values of FLUX refer to greater brightness. This also affects the direction of limits and errors. A type for time related SpaceTimeSys properties, allowing the units to be specified in addition to the value. Units set in this manner override the time units settings set in the TimeFrame. For instance, 'day's may be set for the time stamps, but 'second's may be set for the integration time. The allowed reference positions are TOPOCENTER, GEOCENTER, HELIOCENTER, and BARYCENTER; the latter 2 should only be paired with time scale TDB. SpaceReferenceFrame may be ICRS or GALACTIC Time units may be 'second', 'day', 'year' or 'radian' (for phased data) Spatial units may be 'deg', 'arcmin', 'arcsec' or 'mas'. A period may be specified; it may have its own units attribute overriding the global time unit. If the "folded" attribute is true, the time series is expected to be folded at the value of Period, starting at TimeZero.