Topology Relations

Topology relations are used to define the inter-relationships between the members of a collection and how those members are knitted together to form a mesh. For more information, see *Relation Notes* and saf_declare_topo_relation. Also, see this detailed discussion of the difference between mapping of degrees of freedom of a field to the members of a collection and the mapping of the members of a collection to themselves to indicate topological relationships, (github.com/markcmiller86/SAF/blob/master/src/safapi/docs/dof_maps_and_topo_rels.pdf)