-- Definition -- An element in the hydrographic network used to indicate non-interacting crossing of watercourse links separated by level. -- Description -- NOTE The crossing may legitimately break a no-intersection quality rule.
-- Definition -- A node within the hydrographic network. -- Description -- NOTE May represent a physical confluence, bifurcation/confluence/vanishing point etc, or it may be associated with a hydrographic point of interest or facility.
-- Definition -- A segment of a watercourse within a hydrographic network. -- Description -- NOTE A watercourse link may be fictitious, with no direct correspondence to a real-world object and included only to ensure a closed network. EXAMPLE Fictitious examples: - virtual network segment in coastal water area - virtual network segment in lake area - virtual network segment in river to connect tributary - virtual network segment in transitional water area
-- Definition -- A sequence of watercourse links representing a non-branching path through a hydrographic network.
-- Definition -- Defines categories for different types of hydrographic network nodes.