In ecoSpold1 the three types of datasets (elementary flow, process, and impact category) were all handled within the same dataset structure. In ecoSpold2, separate dataset definitions are applied for these three. "Process" is called "Activity". "Elementary flows" are called "Exchanges with environment". A master lists are available for "Elementary flows" as well as for "Products and Wastes" and "Locations". The references to entries in these master lists will be made through UUIDs. Note: The impact category dataset definition has not yet been fully determined and will be tackled by the working group at a later stage in the format development.