A single <Relationship> record: an opaque id, a type URI, and a
target path that is resolved relative to the directory containing
the .rels file that declared it.
Summary
Types
@type t() :: %ExVEx.Packaging.Relationships.Relationship{ id: String.t(), target: String.t(), target_mode: target_mode(), type: String.t() }
@type target_mode() :: :internal | :external