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This method can be used for tracing in an oriented network. It will start from a link and trace in the reverse (upstream) direction, branching if required. Links without direction are ignored. You can use direction 512 / 1024 as in a normal street network.
This method is only useful for utility networks, such as sewers, water pipes etc. It has little relevance for street networks.
Upstream links are marked as true in the output, including the input link.
Syntax: UpStream(link: integer; links: TBitArray)