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Topic: Conceptual schema

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	GIS Representations and Interoperability
		The conceptual model is used to define common information elements (or ideas used to communicate the needed geospatial data) that underpin the sharing of common data among islands of software-specific GIS applications.
		As a result, the primary objective of the global conceptual schema for interoperable geospatial information is to provide a coherent family of constructs representing abstract objects in a structural manner and to encapsulate the structure in these constructs.
		The global conceptual schema needs only to parse and tag the three elements of geospatial information, and it is up to the user or database to restructure them in the way that suits their purposes.
	www.ncgia.ucsb.edu /conf/interop97/program/papers/yuan/yuan.html (2496 words)

	Schema - Wikipedia, the free encyclopedia
		For example, the axiom schema of replacement is a schema of axioms in axiomatic set theory.
		In psychology or the theory of cognitive development, a schema is a mental set or representation.
		The Schema and the Great Schema (Μεγαλοσχήμος) are part of the monastic attire of advanced monks and nuns in the Eastern Orthodox Church.
	en.wikipedia.org /wiki/Schema (488 words)

	EMail Msg <9110182056.AA04643@venera.isi.edu>
		The conceptual schema is the collection of types and generic rules for objects that may exist in a domain, and the information base is the collection of concepts for the individual objects that exist in the domain.
		In this architecture, the conceptual schema is at the middle of a three-level structure, between the external schema, directed to users of the database, and the internal schema, directed to internal storage systems of the database.
		For example, the internal structure of a conceptual schema, including all the dimensions of the conceptual schema taxonomy, is contained within the model, as is the population of objects identified by the model and related to the schema through the type-instance relation of the IRDS Definition Schema.
	www.ksl.stanford.edu /email-archives/srkb.messages/51.html (8626 words)

	DB-MAIN - InterDB - Conceptual Wrappers for Legacy Databases
		The conceptual wrapper is based on the mapping between the physical schema and the conceptual schema.
		This approach formally defines the mappings between the physical schema of the legacy data component and its conceptual schema, so that, it is possible to derive the wrapper from them in a systematic way.
		The conceptual wrapper relies on the physical and conceptual schema description and the mappings to translate queries and to form the result instances.
	www.info.fundp.ac.be /~dbm/InterDB/ConceptualWrapper.html (950 words)

	Encyclopedia: Conceptual schema (Site not responding. Last check: 2007-10-22)
		A Logical schema is a data model of a specific problem domain that has more detail than a conceptual schema, but does not include the design considerations and physical storage parameters found in a physical schema.
		Conceptual Schema - An ontology for the objects and relationships belonging to a universe of discourse along with necessary propositions about those objects and relationships.
		Conceptual graphs are a highly readable graphic language with a well-defined theoretical basis, a 15-year history of research publications, world-wide user community, and commercial applications in production use.
	www.nationmaster.com /encyclopedia/Conceptual-schema (596 words)

	Month Year Issue
		Conceptual schemes, we are told, are ways of organizing experience; they are systems of categories that give form to the data of sensation; they are points of view from which individuals, cultures, or periods survey the passing scene.
		Factor (8), the developing of a conceptual model on the basis of those relevant constituents, and Factor (9), the physical representation of it, are, in practice, the two proper components of the construction of the conceptual schema.
		Within their framework, "such a global schema is the basis for the design of subschemas, i.e., the portions of the global schema that serve the applications at execution time".
	www.inconcept.com /JCM/January2002/esko.html (4964 words)

	XML Schema Part 1: Structures Second Edition
		The schema language, which is itself represented in XML 1.0 and uses namespaces, substantially reconstructs and considerably extends the capabilities found in XML 1.0 document type definitions (DTDs).
		Chapter 4 presents Schemas and Namespaces: Access and Composition (§4), including the connection between documents and schemas, the import, inclusion and redefinition of declarations and definitions and the foundations of schema-validity assessment.
		The purpose of an XML Schema: Structures schema is to define and describe a class of XML documents by using schema components to constrain and document the meaning, usage and relationships of their constituent parts: datatypes, elements and their content and attributes and their values.
	www.w3.org /TR/xmlschema-1 (8925 words)

	CONCEPTUAL DATA MODELLING CONCEPTS
		Conceptual data models are used to describe a selected portion of a real or postulated world of interest.
		A conceptual schema is a static, time-invariant collection of linguistic or graphical representations that describe the structure of the data of interest.
		An instance of a schema is a dynamic, time-variant collection of data that conforms to the structure of data defined by the schema.
	hem.passagen.se /bnr/entity/entity.htm (1139 words)

	[No title]
		noun concept is complete in conceptual schema in each conceptual model based on the conceptual schema, the entire extension of the noun concept is given in the facts included in the conceptual model Each noun concept that is complete in a conceptual schema is in the conceptual schema.
		Conceptually, the fact model is represented by a set of sentences, each of which connotes either a rule or a ground fact.
		The possibility of schema evolution along with changes to necessity constraints may seem to violate S4, where the accessibility relationship between possible worlds is transitive, but we resolve this by treating such evolution as a metametalevel concern.
	www.omg.org /docs/bei/05-07-01.doc (10441 words)

	Systematic Hypermedia Application Design with OOHDM (Site not responding. Last check: 2007-10-22)
		Figure 6 shows (a simplified version of) the conceptual schema for the example application, where, for the sake of conciseness, we have not shown all attributes of all classes.
		Nodes are defined as object-oriented views of conceptual classes defined during conceptual design, using a query language similar to the one in [17], allowing a node to be defined by combining attributes of different related classes in the conceptual schema.
		In this case the conceptual model is finally implemented using an object-oriented language and navigational classes are instantiated from the framework (see [25, 4]).
	www.cs.unc.edu /~barman/HT96/P52/section3.html (2585 words)

	DiGIR Schema Readme (Usage and Tips)
		The primary structure of a request or response is specified in the protocol XML Schema (digir.xsd).
		A current conceptual schema and excellent example is that representing the Darwin Core V2 dataset (darwin2.xsd).
		The schema documents, for both the protocal and conceptual schemas, as well as some examples, are in the xml module in CVS.
	digir.sourceforge.net /schema/protocol/2003/1.0/schemaReadme.html (1262 words)

	TDAN - Simision - Conceptual Logical Physical
		It is important to note that in the academic world, the conceptual model is detailed enough to allow translation into a conceptual schema; for example it includes attributes (or their equivalent).
		The development of an initial conceptual schema design that excludes performance considerations is prompted by an established (and reasonable) division of expertise.
		Creating a pre-performance conceptual schema requires knowledge of the business and of visible data structures (the options for which are generically similar amongst relational DBMSs); performance tuning requires knowledge of internal schema facilities, and is traditionally the responsibility of someone with expert knowledge of a particular DBMS and its environment.
	www.tdan.com /i036fe02.htm (3143 words)

	Colloquium Lex Wedemeijer (Site not responding. Last check: 2007-10-22)
		Conceptual schemas are described using some preferred data model theory.
		A taxonomy of potential changes can be derived from that data model theory, but it has no great significance for the maintenance and evolution of a given schema because it is based only on the constructs of the data model theory.
		This current state of the art in conceptual modelling can be improved by learning from actual business cases.
	www.cs.ru.nl /research/colloquium/col1999b/wedemeijer.html (152 words)

	The ADO.NET Entity Framework Overview
		Even if there was a higher-level conceptual model used during the design, that model is typically not directly "executable", so it needs to be translated into a relational form and applied to a logical database schema and to the application code.
		In general, applications can't choose the logical database schema (for example, departmental applications that expose data from the company's core system database), and the knowledge of how to map the logical schema to the "appropriate" view of the data that the application requires is implicitly expressed through queries throughout the code.
		Conceptually, we know that a sales person is associated to zero or more sales orders; however, queries need to be formulated in a way that can't leverage that knowledge; instead, this query has to do an explicit join to walk through this association.
	msdn2.microsoft.com /en-us/library/aa697427(VS.80).aspx (7330 words)

	Data : Conceptual Schema
		The conceptual model was generally written down on paper or built using a design tool and the results were hung on a wall for all to see, but was rarely represented directly in the program.
		Often the result was that important implicit knowledge of the software designers was lost when the logical schema was created and each new application ended up creating a new conceptual schema often having to reverse engineer from the existing logical schema.
		My interest is in applying a conceptual schema as part of a process [possibly with tools] in mapping between heteregeneous database schemas.
	blogs.msdn.com /data/archive/2006/07/14/665780.aspx (571 words)

	Next-Generation Data Access: Making the Conceptual Level Real
		While we have motivated the need for making the conceptual level real from the perspective of the SQL data platform it should be apparent that this mapping from real services at the conceptual level to any number of logical and programming/presentation representations is occurring in multiple areas.
		Having the conceptual level is indeed sufficient for many applications as it provides a domain model that is live within the context of a comfortable pattern (ADO.NET commands, connections and data readers) and allows for great late bound scenarios since return values are self describing.
		For the mapping between classes and the conceptual model the constraints are minimal and are along the lines of preserving identity and fidelity of round trips.
	msdn2.microsoft.com /en-us/library/aa730866(VS.80).aspx (7146 words)

	CONCEPTUAL SCHEMA (Site not responding. Last check: 2007-10-22)
		conceptueel schema (conceptual mode, schema), conceptueel gegevensmodel (conceptual mode, schema), schema (model, pattern, schedule, scheme).
		schema (cadre, diagram, draft, formula, layout, outline, pattern, plan, schema, scheme, shell, skeleton, skeleton outline, sketch).
		schema (blank, form, model, pattern, plan, process chart, schedule, scheme, time-able, timetable, time-table), databasschema (conceptual mode, intension, schema, scheme).
	www.websters-online-dictionary.org /definition/CONCEPTUAL+SCHEMA (190 words)

	Extracting Semantic Metadata and Its Visualization
		The local schema layer is the second layer, which is a collection of the manually drawn conceptual schemas for the corresponding information sources.
		The federated schema is a subset manually designed by the domain expert to unify all local schemas; the ontology is the context knowledge represented in a common vocabulary and used for automatically detecting and dynamically resolving various semantic conflicts among information sources.
		A conceptual schema describes the data items and relationships between data items in a form suitable for human presentation.
	www.acm.org /crossroads/xrds7-3/smeva.html (4157 words)

	Conceptual Graph Standard
		The conceptual graph g may have concepts that are not linked to any conceptual relation; but every arc that belongs to any conceptual relation in g must be attached to exactly one concept in g.
		A conceptual relation that is represented by an Actor string may have side effects that are not represented in the abstract syntax or the translation to predicate calculus defined in Chapter 8.
		Conceptual relation nodes are drawn as circles, ovals, or ellipses; they may be called circles, even though they may be elongated to ovals or ellipses to accommodate long identifiers or expressions.
	users.bestweb.net /~sowa/cg/cgstandw.htm (18118 words)

	[No title]
		An Internal Schema (internal level) describes physical storage structure related to the physical data model 2.
		A Conceptual Schema (conceptual level) describes whole database structure data types, constraints, user operations, ¡%#’ " 'H’ " N’ " %#'HN ó* 2DBMS Architecture (con t)¨L2.
		Conceptual Schema (conceptual level) hides the details of storage structure uses conceptual/implementation data models 3.
	ils.unc.edu /~elliv/inls56/notes/Lecture2.ppt (244 words)

	conceptual schema - Syntactic and conceptual schemas
		The conceptual schema states how data appears to be organized from the user's point of view.
		For example, in a relational database, the conceptual schema declares how data is organized into tables and columns, what the data types of each column are, what the primary key / foreign key relationships between the tables are, and so on.
		Notice that the storage engine is translating here between the conceptual schema (which uses the concept of table) and the physical schema (which describes how data is stored on disk).
	www.stylusstudio.com /xmldev/199908/post20200.html (1612 words)

	Defining conceptual requirements
		A 'structural schema' is a set of objects, their properties, and the relationships between objects and properties.
		The conceptual schema influences the collection and interpretation of the structural model which results from establishing the genealogical connections.
		In terms of a genealogical study, the conceptual schema would consist of definitions of people, the kinds of links recorded and maintained and associated theoretical statements about how these interact or are defined in terms of each other.
	www.era.anthropology.ac.uk /Era_Resources/Era/Kinship/kinConcepts.html (1251 words)

	Data Model Views
		When the data model represents the conceptual schema, the external schemata are no longer connected to it, and they are not available at all in data model form.
		And while the conceptual schema often is the starting point for physical data base design, it is very difficult to keep the link current as requirements change.
		When the designer then maps the conceptual data model to a data base design, he or she would map the external data models directly to SQL views and screens.
	www.essentialstrategies.com /publications/modeling/dmviews.htm (2501 words)

	[No title]
		A conceptual model is a language that is used to describe conceptual schemas.
		Physical Design Input: logical schema Output: physical schema A physical schema is a description of the implementation of the database in secondary memory.
		Data definition The DBMS must be able to accept data definitions (external schema, the conceptual schema, the internal schema, and all associated mappings) in source form and convert them to the appropriate object form.
	www.ait.unl.edu /zlee/db/conceptualmodel.doc (1415 words)

	Relational and Multi-dimensional
		The priority in modeling the conceptual schema is to represent the organization’s essential structure.
		While the conceptual structure may be the most efficient as a way of storing data, it is not necessarily the best structure for retrieving them.
		What this means is that while the assignment of a conceptual data modeler is to devise structures that will provide for all possible data structures, the decisions of the data mart designer reflect the specific, often arbitrary, wishes of particular users of the system.
	www.essentialstrategies.com /publications/datawarehouse/relmult.htm (2851 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The normative schema constructs, which are part of the meta-model partition, are described in a language based on the fundamental concepts in the defining schema.
		The application schema is expressed using the syntax and semantics of one or more conceptual schema languages represented at the meta-model level.
		conceptual model model that defines concepts of a universe of discourse conceptual schema formal description of a conceptual model conceptual schema language formal language based on a conceptual formalism for the purpose of representing conceptual schemas EXAMPLE UML, EXPRESS, IDEF1X NOTE A conceptual schema language may be lexical or graphical.
	www.wmo.ch /web/www/WDM/IPET-MI-II/draft_guidance_catalogues.doc (1643 words)

	XER - Extensible Entity Relationship Modeling
		For simplicity's sake, the translation from a DTD or schema to XER would be considered a “reverse translation” or “up-translation”, and from XER to a DTD or schema would be considered a “forward translation” or “down-translation”.
		Since the schema is converted into ENF, all XML attributes are converted to simple elements and the rules for the simple elements will apply while converting the schema into a XER diagram.
		XML schema supports a lot of restrictions that can be used to constrict the values that the elements of the schema can accept.
	www.idealliance.org /papers/dx_xml03/papers/06-01-01/06-01-01.html (3244 words)

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