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This situation constitutes a contradictory circular reference, because according to the original blueprint (Taswell, 2008a), a resource must be registered first at a PORTAL registry before it can be described at a DOORS directory, whereas in this scenario, it must be described before it can be registered. Both temporal sequences are not simultaneously possible. Various solutions for implementations that resolve this circular reference problem include the following: (A) Splitting the resource description into a PORTAL required portion and a 32 Semantic Web DOORS permitted portion; (B) Using record status codes “Invalid”, “Pending”, and “Valid” exchanged between PORTAL and DOORS; (C) Using PORTAL resource tags instead of DOORS resource descriptions to determine eligibility; and (D) Building an alternative design that combines both PORTAL and DOORS services into a single NEXUS service.

First commercial systems for NL-text processing. The main achievements of R&D during these periods include the following: the functionality of different classes of NLP-systems and their main components was specified (for the most part, these results have retained their importance to this day); theoretically and practically significant morphological models of analysis/synthesis of word forms were proposed; basic models of NL syntactic parsers were developed; a range of practical methods was proposed for the implementation of basic NL syntactic parsers; basic techniques were outlined for heuristic implementation of partial models of NL-statement interpretation; partial models of NL-text conceptual synthesis were developed; some models and methods of linguistic synthesis were suggested and tested within prototype implementations; multilevel (both, linguistic and cognitive) models of text understanding were developed; prototypes of intelligent NL-systems were implemented; several commercial implementations of NL-systems appeared that, for the most part, only mimic full-scale natural language understanding (NLU).

Later, when software agents, webbots, and converters become available, content will be generated automatically or semi-automatically. For manually contributed content compared with automatically generated content, there may be a trade-off in the quality of content produced versus the rate of content production. This trade-off would not be applicable to those situations where existing databases only need an appropriate interface for inbound queries and wrappers for outbound responses. 6. Conclusion A new bootstrapping combined design for PDS, together with the original separate design for PDS, has been implemented for NEXUS registrars, PORTAL registries, and DOORS directories and demonstrated with the problem-oriented domains declared for the GeneScene, ManRay, BioPORT, and BrainWatch prototype registries.

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