Daniel Barbara and Chris Clifton. Information brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, Princeton, NJ, October 1992.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....user queries to known information sources. The knowledge about existing sources is acquired by exchanging messages with neighboring hosts. This approach has a probabilistic query semantics because finding all relevant objects is not guaranteed. The Information Brokers of the MITL Gold project [BC92] share many of our goals. However, Information Brokers do not provide access to objects directly. Rather, they return descriptions of an 4 object s location and the method that may be used to retrieve the object. Unlike the previous systems, our architecture combines in a transparent way ....

Daniel Barbara and Chris Clifton. Information brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, Princeton, NJ, October 1992.

....] are twosoftware packages that translate NFS protocol requestsinto FTP requests. By installingthese packages, it is possible to access much more information through NFS. One mightbetempted todescribe them as mediators for NFS# however, it would be more accurate to call them translators[Barbar aand Clifton, 1992]. The NFS and FTP protocols both access hierarchical file systems. Theoperations supported are similar# only theprotocol needs to be translated. The translator is making it possible to access more data, but not more kinds of data. Even if mediators were written to provideaccesstodiverse data via ....

Barbar'a, Daniel and Clifton, Chris (1992). Information brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, 182 Nassau Street, Princeton,NJ08542.

....new document are sent a descriptor of the new document. The generator objects associated with the brokers are gathered by a directory of servers, which is queried initially by the users to obtain a list of the brokers whose generator rules match the given query. See also [Danzig et al. 1991] [Barbara and Clifton 1992], Ordille and Miller 1992] and [Simpson and Alonso 1989] are other examples of this type of approach in which users query meta information databases. A content based routing system is used in [Sheldon et al. 1994] to address the resource discovery problem. The content routing system keeps ....

Barbar a, D. and Clifton, C. 1992. Information Brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92 (Oct.), Matsushita Information Technology Laboratory.

....rules match the new document are sent a descriptor of the new document. The generator objects associated with the brokers are gathered by a directory of servers, that users query initially to obtain a list of the brokers whose generator rules match the given query. See also [DANO91] SA89] BC92] and [OM92] are other examples of this type of approach in which users query meta information databases. The content based routing system of [SDW 94, DS94] keeps a content label for each information server (or collection of objects, more generally) with attributes describing the ....

Daniel Barbar'a and Chris Clifton. Information Brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, October 1992.

....must be maintained by hand, and are therefore frequently out of date (or non existent) Finding information can be frustrating to say the least. To address this problem, an increasing number of systems allow users to query a collection of meta information about available databases (e.g. 36] [2], and [28] or the Content Router [35, 11] The meta information typically provides some sort of summary of the contents of each database; thus, these systems fit our generic concept of a broker. Of course, different systems use different representations of this summary information and their ....

Daniel Barbar'a and Chris Clifton. Information Brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, October 1992.

....the new document are sent a descriptor of the new document. The generator objects associated with the brokers are gathered by a directory of servers, that is queried initially by the users to obtain a list of the brokers whose generator rules match the given query. See also [DANO91] SA89] BC92] and [OM92] are other examples of this type of approach in which users query meta information databases. A content based routing system is used in [SDW 94] to address the database discovery problem. The content routing system keeps a content label for each information server (or ....

Daniel Barbar'a and Chris Clifton. Information Brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, October 1992.

....must be maintained by hand, and are therefore frequently out of date (or non existent) Finding information can be frustrating to say the least. To address this problem, an increasing number of systems allow users to query a collection of meta information about available databases (e.g. 36] [2], and [28] or the Content Router [35, 11] The meta information typically provides some sort of summary of the contents of each database; thus, these systems fit our generic concept of a broker. Of course, different systems use different representations of this summary information and their ....

Daniel Barbar'a and Chris Clifton. Information Brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, October 1992.

....available databases. The meta information typically provides some summary of the contents of each database; thus, these systems fit our generic concept of a broker. Of course, different systems use different types of summaries, and their implementation varies substantially (e.g. 23] 10] 38] [2], 30] 37, 11] and [29, 35] Some systems provide manual mechanisms to specify meta information (e.g. WAIS [23] Yahoo 9 , and ALIWEB 10 ) and attach human generated text summaries to data sources. Given a query, these systems search for matching text summaries and return the attached ....

Daniel Barbar'a and Chris Clifton. Information Brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, October 1992.

....the new document are sent a descriptor of the new document. The generator objects associated with the brokers are gathered by a directory of servers , that is queried initially by the users to obtain a list of the brokers whose generator rules match the given query. See also [DANO91] SA89] and [BC92] are other examples of this type of approach in which users query a meta information database. A content based routing system is used in [SDW ] to address the database discovery problem. The content routing system keeps a content label for each information server (or collection of ....

Daniel Barbar'a and Chris Clifton. Information Brokers: Sharing knowledge in a heterogeneous distributed system. Technical Report MITL-TR-31-92, Matsushita Information Technology Laboratory, October 1992.

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