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Optional information that will be displayed in the column header of the table. It is possible to make use of the location attributes, that can be included with the @-signs. If the attribute is empty or does not exist, the headerLine is not used.
It is possible to have multiple headerLines, but every headerLine can only contain one attribute.
Default view period
The optional default view period can be used to define the time span of data displayed in the time series display (unless overruled by the user).
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