Folks, On yesterday's telcon we discussed how to describe interfaces in the OGSA Data Architecture document. I undertook to draft a straw man description of the ByteIO interface as an example. I attach this draft for comment. (Note: it is based on the ByteIO interface described in our document, which is significantly out of date. What we're interested in here is the format, not the content). On the telcon we agreed that we wanted to abstract away the details of the operations such as their names and the names and types of their parameters. This is so that (a) we don't swamp our readers with detail, and (b) we don't have to keep changing our document to track changes in the detailed specification. On the other hand, we do want to describe the key operations, so that (a) readers can better understand what the interface does, and (b) we show how the interface will interact with other parts of the system. I'm not wedded to the format in the attachment. It is purely intended as a starting point for discussion. Best wishes, Dave.