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Setting a property to an empty value "" will have the same result as omitting the property from the XML configuration.
The "onbekend" value that is listed for some properties can only be used in combination with qualityRegime IMBRO/A, which can be selected during registration of a GLD and cannot be changed afterwards.
For each exported XML file a BRO ID is required. This can either be the same as the internal locationId or (preferably) should be configured as a location attribute. The location attribute that holds the BRO ID should be mapped, using a location id function. For example:
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