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The standard deals with the geographic representation of surface water systems. The handbook and the standard handle the following aspects of surface water: — the inherent hierarchical structure in the various sub systems and levels of the surface water system — how the surface water system can be represented in different levels of detail — the surface water system as a correct flow network with described topology — unique identities, phenomenon identities, hydrological codes and some central attributes — how information is updated — version management — how time validity can be expressed — metadata, specifically quality — geometries in several dimensions, reference systems.