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In the absence of explicit final report acknowledgment ( which entails retransmission of the report in case of the loss of the report acknowledgment ) , the alternatives are ( a ) to close the session immediately on transmission of the report segment that signifies complete reception and ( b ) to close the session on receipt of an explicit authorization from the sender . In this case the positive roots are of the form a + c for all positive roots a of the associated finite root system and non-negative integer constants c , as well as - a + c where a is positive and c is a positive integer . This is because the UAC core handles retransmissions of the ACK , not the transaction layer . Binary and hexadecimal coding schemes for character , integer , and floating point data , including two 's complement and excess notation ; round-off errors and overflow errors ; defining features a of random-access memory and mass storage ; quantifying data storage and retrieval times ; remarks on current technology . Building on this similarity , the paper describes a of technical areas where ideas from database research could be usefully followed up in work on the Semantic Web , such as large-scale identifier management , heterogeneous data integration , and the use of " context " concepts in supporting that integration .