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ns2 project in arunachal Pradesh MRP matches all instances against the set of MRP reports back to appropriate sites which inmet arules. stances are ns2 project in arunachal Pradesh firable. Clearly, under the naive approach, the MRP cannot proceed until all instances have been received from all base rule matching sites. This synchronization ns2 project in arunachal Pradesh is strictly not necessary; in general, redactions may occur as soon as a metarule is mat,ched. Thus, base rule and metarule evaluations may be pipelined. This observation ns2 project in arunachal Pradesh motivaks the development of the centralized two-phase Match/Tag-Fire scheme in the rest of this section.
The basic algorithm can be extended ns2 project in arunachal Pradesh to the distributed case as well. We outline various distributed schemes that may utilize t,he basic two-phase pipeline processing method in the next, section. In the basic centralized version of tthe algorithm, all sites send their rule instance as they are generated to the MRP. The goal is to have the metarule processing at the MRP nearly completed by the time ns2 project in arunachal Pradesh the last instance is received from the slowest site. This is called “two-phase rnetarule processing” There is one IR for each rule in the rule program.
The relation scheme for an IR is obtained by conjoining the schema of the relations referenced on the LHS of the rule. As instances of base rules are received by the MRP, they are stored in the ns2 project in arunachal Pradesh appropriate IR. For each instance received at the MRP, a structure is created to represent the set of all metarules that are capable of redacting that instance. This is ns2 project in arunachal Pradesh called a “Wait-For”structure, and can be viewed as a tree. The instance in question is at the root, and each child node represents the LHS ns2 project in arunachal Pradesh conditions of a relevant metarule, represented as a list of conditional expressions that appear in the metarule.