Aggregation GUID

[SF_lt]

why properties window (Alt+1) doesn't show connectors GUID (in my instance aggregation)?

transformation log shows, that it uses XRef with the GUID, but can't know, from what element it comes

besides, intermediary language specification is needed to write complete transformations - Sparx doesn't disclose all operators, keywords and macros of it (shame of Sparx- without this information transform capability is crippled). And to learn by trials and faults method seems as a reverse engineering to me