James Clifford and Ahobala Rao. A Simple, General Structure for Temporal Domains. CRIS 154, Center for Research on Information Systems, Stern School of Business, New York University, October 1986.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....is order preserving (blocked) iff the collapse fl is order preserving (blocked) 2 All order preserving collapses are blocked, though the converse is not necessarily true. The definition of blocked collapse and expansion of ordering domains is similar to the concept of intervallic partitions in [CR86] and the concept of time units in [WJS93] The definition of order preserving collapses will be used in the next chapter on optimization techniques. There is one other variant of an order preserving Collapse operator that does not have a corresponding Expand operator. This variant is not based ....

James Clifford and Ahobala Rao. A Simple, General Structure for Temporal Domains. CRIS 154, Center for Research on Information Systems, Stern School of Business, New York University, October 1986.

....Sequence queries. 6] presents an object oriented approach to providing lower level operators on temporal objects. Our approach instead uses high level algebraic operators to query sequences. The concepts of collapse and expansion of ordering domains are similar to the intervallic partitions of [4] and the time units of [20] There has also been closely related work on calendric systems by [2] and [17] We discuss the similarities and differences in greater detail in [15] An expression recognition system on event sequences has been implemented as part of the ODE project[7] In [15] we ....

James Clifford and Ahobala Rao. A Simple, General Structure for Temporal Domains. CRIS 154, Center for Research on Information Systems, Stern School of Business, New York University, October 1986.

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