Hi Piotr & All;

I have reviewed the document and have one question. Section 4 is DataInfo message type. As wiki says it is probably used only in pSPS. In geant perfsonar MA services (SQL MA nad RRD MA) don't use it and actually I don't know anything about this type of message. Could you tell me what is used for? And should we implement it in our services to be compatible with pSPS or it is not obligatory message type?

The message was implemented as a specific use case for a pSPS service, it was discussed in a previous DICE meeting but at the time it was not recommended for implementation everywhere. This message is similar to a MetadataKeyRequest, but returns additional information inside of the 'key' element. See here (under 'Future Directions'): https://wiki.man.poznan.pl/perfsonar-mdm/index.php/PerfSONAR_developer_meeti... I would not recommend implementing it since it breaks the primary rule for the 'key' element of forcing a client to look inside and find content (keys should be opaque). The solution is not very clean, and I would prefer that we didn't even bother to document this message because of this reason. We could 'fix' the key issue but, this also means more time developing a protocol (something I would prefer we didn't do at this time since we need to make progress in documentation). Comments? -jason