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In the above example the visibilityStartTime and visibilityEndTime tags are used to define the columns in the DBF file that contain the start and end dateTimes of the visibilityPeriod for each location. The (optional) visibilityPeriod is the period for which a location is visible in the user interface. The start and the end of the period are inclusive. Currently the visibility period is used in the map (explorer) window, the time series display and the spatial display. If startDateTime is not defined, then the location is visible for all times before endDateTime. If endDateTime is not defined, then the location is visible for all times after startDateTime. If startDateTime and endDateTime are both not defined, then the location is visible for all times. Furthermore the (optional) dateTimePattern tag is used to define the pattern for the dateTimes defined in the DBF file. If dateTimePattern is not specified, then the default pattern "yyyyMMdd" is used, which is the internal format that a DBF file uses for columns of type 'D' (date columns). The (optional) timeZoneOffset is the offset of the times in the DBF file, relative to GMT. For example "+02:00" means GMT+02:00. If no offset is specified, then time zone GMT is used by default.
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