When mapping two resources in a d2d pipeline I would like to store explanatory data in the relation

When mapping two resources in a d2d pipeline I would like to store explanatory data in the relation.

For instance when I map a debug-built binary ELF to source files using DWARF debug symbols I would like to store in the relation the fact this is was mapped using one or more DWARF debug symbols of this type and with this value.

With this information, I can review and validate the results more efficiently without having to do extra research and this would provide effective tracing to explain why this mapping exists.