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The BroGldAdditionServer can import multiple XML files by specifying time series sets and a relativeViewPeriod. However, the BRO GLD doesn't have multiple parameters (in the FEWS sense) , most likely only the headonly the heads in reference to NAP (for details see Basisregistratie Ondergrond Catalogus Grondwaterstandonderzoek (geostandaarden.nl)), so the external BRO parameter will always be mapped to the specified internal parameterId. This also means that the timeSeriesSets should only hold 1 parameterId.
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