If the initiator wishes to communicate only the hashing algorithm at the beginning of the session (e.g., because it has not yet calculated the checksum), it can send an empty <hash/> element (without a checksum in the XML character data as shown in the previous examples) in the session-initiate message; this enables the recipient to check the file during the transfer session (which can be helpful in the case of transfers that are truncated or fail mid-stream).
+If the initiator wishes to communicate only the hashing algorithm at the beginning of the session (e.g., because it has not yet calculated the checksum), it can send <hash-used/> element in the session-initiate message; this enables the recipient to check the file during the transfer session (which can be helpful in the case of transfers that are truncated or fail mid-stream).