dablink This article is about the W3C s XMLSchema language, also known as XSD XMLSchema Definition . For information about XMLschema languages in general, see XMLschema infobox file format name XMLSchemaW3C extension .xsd mime application xml, text xml owner http www.w3.org World Wide Web Consortium genre XMLschemaXMLschema languages XMLSchema language extendedfrom XML standard http www.w3.org ... XMLSchema , published as a W3C recommendation in May 2001, is one of several XMLschemaXMLschema languages . It was the first separate schema language for XML to achieve Recommendation status by the W3C. Because of confusion between XMLSchema as a specific W3C specification, and the use of the same ... as WXS , an initialism for W3CXMLSchema, while others referred to it as XSD , an initialism for XMLSchema Document a document written in the XMLSchema language, typically containing the xsd ... wikibooks XMLSchemaW3CXMLSchema 1.0 Specification http www.w3.org TR xmlschema 0 XSD 1.0 Primer ... www.w3.org XMLSchema Tools Tools W3CXMLSchema 1.1 Specification http www.w3.org TR xmlschema11 ... XMLSchemaXMLSchemaW3C Standards Categories DEFAULTSORT XmlSchema Category World Wide ... Schema fi XML skeema sv XMLSchema uk XMLSchemaW3C zh XMLSchema .... Like all XMLschema languages, XSD can be used to express a set of rules to which an XML document ... the influence of Document Type Definition DTD s and other early XMLschema efforts such as DDML , Schema for Object Oriented XML SOX , XML Data, and XDR Schema XDR . It has adopted features from each ... and supported for a while after XMLSchema was published. A number of Microsoft products supported XDR until the release of MSXML 6.0 which dropped XDR in favor of XMLSchema in December 2006 ... XMLSchema instance . XMLSchema Documents usually have the filename extension .xsd . A unique Internet ... should be used, as per RFC 3023. Data types Unlike DTDs, an XMLSchema allows the content of an element ... more details
dablink This article is about XML schemas in general. For information on the W3C recommended schema language for XML, see XMLSchemaW3C . An XMLschema is a description of a type of XML document, typically ... schema. DTD validating Parsing parser s are most common, but some support W3CXMLSchema or RELAX NG ... for Object Oriented XML SOX Schematron SGML XDR SchemaXML Data Reduced XDR XMLSchemaW3CXMLSchema ... www.w3.org 2005 05 25 schema guthula.html Application of XMLSchema in Web Services Security by Sridhar Guthula, W3CSchema Experience Report, May 2005 Categories DEFAULTSORT XmlSchema Category XML ... is native to the XML specification, is a schema language that is of relatively limited capability, but that also has other uses in XML aside from the expression of schemas. Two more expressive XMLschema languages in widespread use are XMLSchemaW3CXMLSchema with a capital S and RELAX NG . The mechanism for associating an XML document with a schema varies according to the schema language. The association ..., including DTD, XMLSchema aka XSD , RELAX NG, or others, and should always be written using lowercase except when appearing at the start of a sentence. The form Schema capitalized in common use in the XML community always refers to XMLSchemaW3CW3CXMLSchema . Validation The process of checking to see if an XML document conforms to a schema is called XML validation validation , which is separate ... XML parsing. In practice, however, many schema validators are integrated with an XML parser. XMLschema languages Document Content Description facility for XML, an Resource Description Framework RDF ... XML Information Set XMLSchema Language Comparison Schema disambiguation for other uses of the term ... XMLSchema Languages by Eric van der Vlist 2001 http pike.psu.edu publications sigmod record 00.pdf Comparative Analysis of Six XMLSchema Languages by Dongwon Lee, Wesley W. Chu, In ACM SIGMOD Record ... XMLschema uk XMLschema ... more details
Schema for Object Oriented XML , or SOX , is an XMLschema language developed by Commerce One . In 1998 a SOX specification was submitted to the World Wide Web Consortium and published as a W3C Note. A revised version, SOX 2.0, was published as a W3C Note in 1999. SOX was one of several predecessors of the W3C s XMLSchemaW3CXMLSchema language. After the publication of XMLSchema, SOX continued to be supported by Commerce One until the company s bankruptcy in late 2004. The patents for SOX and other Commerce One technologies were purchased by Novell, Inc. in December 2004, reportedly in an effort to prevent them from being exploited by unrelated companies whose primary business is filing patent related lawsuits. http www.iht.com articles 2005 05 02 business novell.php See also XMLSchemaW3CXMLSchema Simple Outline XML another XML technology with the initials SOX External links http www.w3.org TR NOTE SOX SOX schema language W3C Note Soft eng stub Category XML Category XML based standards ja Schema for Object Oriented XML ... more details
for specifying an XMLschema. Each language has its strengths and weaknesses. Note the W3C defined schema language is called XMLSchemaW3CXMLSchema . However, this name can be confusing in the context ..., while the term XMLSchemaW3CW3CXMLSchema referred to in this article as WXS will be used for the W3C ..., the primary three languages are Document Type Definition s, XMLSchemaW3CW3CXMLSchema , and RELAX ... as well. W3CXMLSchema main XMLSchemaW3C Advantages over DTDs Compared to DTDs, W3CXML Schemas ... aware, and provide support for types. W3CXMLSchema is written in XML itself, and therefore has a schema of its own appropriately, written in W3CXMLSchema . W3CXMLSchema has a large number of built in and derived data types. These are specified by the W3CXMLSchema specification, so all W3CXMLSchema validators and processors must support them. Due to the nature of the schema language ... to PSVI . Unlike W3CXMLSchema, RELAX NG was not designed with type assignment and data binding in mind. W3CXMLSchema has a formal mechanism for attaching a schema to an XML document. RELAX NG has ... info set , while W3CXMLSchema does. ref While annotations in RELAX NG can support default attribute ... W3CXMLSchema has a rich simple type system built in xs number, xs date, etc., plus derivation of custom ... pattern, maxLength, etc. of W3CXMLSchema. In W3CXMLSchema a specific number or range of repetitions ... not possible to specify at all in RELAX NG. Disadvantages W3CXMLSchema is complex and hard ... being written in XML is an advantage, it is also a disadvantage in some ways. The W3CXMLSchema ... and W3CXMLSchema ref W3CXMLSchema does not implement most of the DTD ability to provide data elements ... that this ability can create as well, which makes it a strength. Although W3CXMLSchema s ability to add ... against that schema. In effect, all users of such an XML document must also implement the W3C ... main RELAX NG RELAX NG provides for most of the advantages that W3CXMLSchema does over DTDs. Advantages ... more details
Wikify date January 2009 The W3C s XMLSchemaW3CXMLSchema Recommendation defines a formal mechanism for describing XML documents. The standard has become very popular and is used by the majority of List of XML Schemas standards bodies when describing their data. ref http www.w3.org TR xmlschema 0 W3C Primer ref The standard is very versatile allowing for programming concepts such as inheritance ... large amounts of time to it. XMLSchema Editor Tools The problems users face when working with the XSD ... based editor can be used to edit an XMLSchema, a graphical editor offers the biggest advantages, allowing ... approaches to the presentation of information Text View The text view of an XMLSchema shows the schema in its native form. XMLSchema Editors generally add to the text view with features like inline ... View A physical view of an XMLSchema displays a graphical entity for each element within the XMLSchema. This can make an XSD document easier to read, but does little to simplify editing. This is largely .... POV check date January 2009 Logical View A logical view shows the structure of the XMLSchema ... of the XMLSchema, making it easier to understand the structure of the document, and makes it easier ... views for a simple schema. source lang xml ?xml version 1.0 encoding utf 8 ? xs schema elementFormDefault ... XML Document for the schema source lang xml ?xml version 1.0 encoding utf 8 ? Person Name ID ... with. XMLSchema Editors As the XSD standard has gained support, a host of XMLSchema editors have ... valign top Oxygen xml http www.oxygenxml.com xmlschema editor.html screenshots Image Tick green.png ... Stylus Studio http www.stylusstudio.com xmlschema editor.html screenshots Image Tick green.png center ... Fox Freeware Edition http www.xmlfox.com xmlschema editor.htm screenshots Image Tick green.png center 16px Image Tick green.png center 16px References Reflist DEFAULTSORT XmlSchema Editor Category XML ... coloring. In more lengthy and complex schema documents, this is often difficult for even highly ... more details
Wiktionary The word schema comes from the Greek word skh ma , which means shape, or more generally, plan . The plural is skh mata . In English, both schemas and schemata are used as plural forms. Schema may refer to Conceptual model Model abstract Diagram Schematic , a diagram that represents the elements of a system using abstract, graphic symbols In computer science XMLschema , a way to define the structure, content and, to some extent, the semantics of XML documents Database schemaSchema genetic algorithms , a set of programs or bit strings that have some genotypic similarity usually specified by a template Axiom schema , a rule describing a set of statements in formal logic In science Schema Kant , in philosophy the referencing of a category to a sense impression through time Schema psychology , a mental set or representation Image schema , a recurring pattern of spatial sensory experience SCHEMA bioinformatics , an algorithm used in protein engineering to identify fragments of proteins that can be recombined without disturbing the integrity of the proteins three dimensional structure In Electrical Engineering Electrical schematic , a wiring diagram of an electrical circuit Schema may also refer to Great Schema , a degree of Orthodox monasticism Stereotype , a set of associated behaviors See also Scheme disambiguation disambig Category Greek loanwords cs Sch ma da Skema de Schema el fr Sch ma ko it Schema he nl Schema ja ru sv Schema olika betydelser uk ... more details
The T schema or truth schema not to be confused with Convention T is used to give an inductive definition of truth which lies at the heart of any realisation of Alfred Tarski s semantic theory of truth . The T schema is often expressed in natural language , but it can be formalized in many sorted predicate logic or modal logic such a formalisation is called a T theory . T theories form the basis of much fundamental work in philosophical logic , where they are applied in several important controversies in analytic philosophy . As expressed in semi natural language where S is the name of the sentence abbrivated to S S is true if and only if S Example snow is white is true if and only if snow is white. The inductive definition By using the schema one can give an inductive definition for the truth of compound sentences. Atomic sentences are assigned truth value s disquotationally. For example, the sentence Snow is white is true becomes materially equivalent with the sentence snow is white , i.e. snow is white is true if and only if snow is white. The truth of more complex sentences is defined in terms of the components of the sentence A sentence of the form A and B is true if and only if A is true and B is true A sentence of the form A or B is true if and only if A is true or B is true A sentence of the form if A then B is true if and only if A is false or B is true see material implication . A sentence of the form not A is true if and only if A is false A sentence of the form for all x, A x is true if and only if, for every possible value of x , A x is true. A sentence of the form for some x, A x is true if and only if, for some possible value of x , A x is true. See also Principle of bivalence Law of excluded middle External links http plato.stanford.edu entries tarski truth Stanford Encyclopedia of Philosophy entry on Tarski s Truth Definitions http plato.stanford.edu entries self reference Matt sema Self reference 2.1 Consequences of the Semantic Paradoxes in Stanford ... more details
. XMLSchema Main XMLSchemaW3C A newer XMLschemaschema language, described by the W3C as the successor of DTDs, is XMLSchemaW3CXMLSchema , often referred to by the acronym and initialism initialism for XMLSchema instances, XSD XMLSchema Definition . XSDs are far more powerful than DTDs ... Yes Infobox W3C Standard title Extensible Markup Language XML status Published year started 1996 ... standards related standards XMLSchema abbreviation XML domain Serialization Data Serialization website ... APIs have been developed that software developers use to process XML data, and several XMLschemaschema systems exist to aid in the definition of XML based languages. As of 2009 , hundreds of XML ... continue normal processing. A DTD is an example of a XMLschemaschema or grammar . Since the initial publication of XML 1.0, there has been substantial work in the area of schema languages for XML ... relationships. DTD Main Document Type Definition The oldest schema language for XML is the Document ... due to its inclusion in the XML 1.0 standard. DTDs are terse compared to element based schema ... based on regular expression syntax, inherited from SGML , to describe the schema. Typical XML APIs ... framework than XMLSchema, making it easier to use and implement. It also has the ability to use ... in an XML document to conform to definitions in XMLSchema Datatypes. Schematron Main Schematron ... of patterns in an XML document. It typically uses XPath expressions. ISO DSDL and other schema languages ... validators. DSDL schema languages do not have the vendor support of XML Schemas yet, and are to some ... for publishing . Some schema languages not only describe the structure of a particular XML format ... is an XML oriented query language strongly rooted in XPath and XMLSchema. It provides methods to access ... 4, 1997. ref cite web url http www.w3.org XML 9712 reports.html title Reports From the W3C SGML ERB to the SGML WG And from the W3CXML ERB to the XML SIG publisher W3.org date accessdate 2009 ... more details
may be produced e.g., XML is now in its fifth edition . W3C also publishes various kinds of informative ...A W3C Recommendation is the final stage of a ratification process of the World Wide Web Consortium W3C working group concerning a technical standard . This designation signifies that a document has been subjected to a public and W3C member organization s review. ref http www.hicom.net oedipus vicug atag.html rec The designation W3C Recommendation signifies that a document has been subjected to a public review and that it has been circulated amongst W3C member organizations for review. ref It aims to standardise the Web technology. ref http www.w3.org 2005 10 Process 20051014 tr.html Reports The W3C technical report development process is the set of steps and requirements followed by W3C Working Groups to standardize Web technology. ref It is the equivalent of a published technical standard in many other industries. Standard maturation In accord with the W3C Process Document, a Recommendation progresses through several maturity levels. Working Draft WD This section is linked from XML pipeline At the working draft level, the standard is published for review by the community . A WD document .... At this stage, the document has been submitted to the W3C Advisory Council for final approval. While ... phase. W3C Recommendation REC This is the most mature stage of development. At this point, the standard .... This standard is now endorsed by the W3C as a standard for wide deployment in its problem domain ... http www.w3.org W3C homepage http www.w3.org Consortium Process W3C Process Document http www.w3.org 2005 10 Process 20051014 tr RecsW3C W3C Definition http www.w3.org TR tr status all all W3C Technical Reports and Publications PR, PER, CR, WD W3C Standards DEFAULTSORT W3c Recommendation Category World Wide Web Consortium standards id Rekomendasi W3C is W3C tilm li ja W3C ru W3C zh W3C ... more details
The Multimodal Interaction Activity is an initiative from W3C aiming to provide means mostly XML to support Multimodal Interaction scenarios on the World Wide Web Web . This activity was launched in 2002. The Multimodal Interaction Framework Working group has already produced the Multimodal Interaction Framework, providing a general Software framework Framework for Multimodal Interaction , and the kinds of markup languages being considered. A set of Use case s. A set of Core Requirements, which describes the fundamental requirements to address in the future specifications. The set of devices that are considered are Mobile phone s, automotive telematics, Personal computer PC s connected on the World Wide Web Web . Current work The following XML specifications currently in advanced Working draft state are already addressing various parts of the Core Requirements EMMA Extensible Multi Modal Annotations a data exchange format for the interface between input processors and interaction management systems. It will define the means for recognizers to annotate application specific data with information such as confidence scores, time stamps, input mode e.g. key strokes, speech or pen , alternative recognition hypotheses, and partial recognition results etc. InkML an XML language for digital ink traces an XML data exchange format for ink entered with an electronic pen or stylus as part of a multimodal system. Multimodal Architecture A loosely coupled architecture for the Multimodal Interaction ... Interaction VoiceXML the W3C s standard XML format for specifying interactive voice dialogues between ... Call Control eXtensible Markup Language SCXML an XML language that provides a generic state machine ... on W3C site http www 128.ibm.com developerworks web library wa multimodarch1 The W3C Multimodal Architecture, Part 1 Overview and challenges on IBM DeveloperWorks W3C standards DEFAULTSORT W3c Mmi Category World Wide Web Consortium standards Category XML based standards Category Multimodal interaction ... more details
Context date October 2009 XML Data Reduced XDR was a schema language for specifying and validating XML documents. In January 1998, Microsoft , the University of Edinburgh and others submitted a proposal for an XMLschema language called XML Data to the World Wide Web Consortium. XML Data Reduced was a subset of XML Data, with some corrections and amendments submitted in July 1998. ref http www.ltg.ed.ac.uk ht XMLData Reduced.htm XML Data reduced ref The XMLSchemaXMLSchemaW3C effort in the World Wide Web Consortium W3C received several other proposals, and while the final result has some similarities to the XDR proposal, it is significantly different. XDR was implemented in SQL Server 2000 and Biztalk Server 2001. Once the XMLSchema Definition was finalised in 2001, Microsoft products and tools added support for it, and XDR was gradually phased out. MSXML Microsoft XML Core Services provided XDR schema support from versions 2.0 up to but not including version 6.0 ref http msdn2.microsoft.com en us library ms757825 VS.85 .aspx Version and Conformance Bot generated title ref . See also XMLSchema Language Comparison Comparison of other XMLSchema languages not XDR . List of XML Schemas list of XML schemas in use on the Internet sorted by purpose External links http msdn2.microsoft.com en us library ms256049.aspx XDR Schema Data Types Reference References Reflist Category XML compu storage stub ... more details
Infobox W3C Standard title RDF Schema status Published year started 1998 editors Dan Brickley , Ramanathan V. Guha base standards Resource Description Framework RDF related standards Web Ontology Language OWL abbreviation RDFS domain Semantic Web website http www.w3.org TR rdf schema RDF Schema RDF Schema variously abbreviated as RDFS , RDF S , RDF S , or RDF S is an extensible knowledge representation language, providing basic elements for the description of ontology computer science ontologies , otherwise called Resource Description Framework RDF vocabularies, intended to structure RDF resource Web resources . The first version ref http www.w3.org TR 1998 WD rdf schema 19980409 RDFS first version ref was published by the World Wide Web Consortium W3C in April 1998, and the final ref http www.w3.org TR rdf schema Final W3C recommendation ref W3C recommendation was released in February 2004. Many RDFS components are included in the more expressive language Web Ontology Language OWL . Main RDFS constructs The RDFS vocabulary builds on the limited Resource Description Framework RDF Vocabulary vocabulary of RDF . Classes rdfs Resource is the class of everything. All things described by RDF are resources. rdfs Class declares a resource as a class philosophy class for other resources. A typical example of an rdfs Class is tt foaf Person tt in the Friend of a Friend FOAF software FOAF vocabulary. An instance of tt foaf Person tt is a resource that is linked to the class tt foaf Person ... TR rdf schemaW3C RDFS Specification http www.w3.org TR REC rdf syntax W3C RDF Primer Semantic Web W3C Standards DEFAULTSORT Rdf Schema Category RDF Category Knowledge representation languages Category Semantic Web Category World Wide Web Consortium standards de RDF Schema es RDF Schema fr RDF Schema pl RDF Schema ... the class of XML literal values. rdf XMLLiteral is an instance of rdfs Datatype and thus a subclass ... more details
Citations missing article date March 2007 Essay like date December 2007 Physical Schema is a term used in relation to data management. In the American National Standards Institute ANSI four schema architecture, the internal schema was the view of data that involved data management technology. This was as opposed to the external schema that reflected the view of each person in the organization, or the conceptual schema that was the integration of a set of external schemas. Subsequently the internal schema was recognized to have two parts The logical schema was the way data were represented to conform to the constraints of a particular approach to database management. At that time the choices were hierarchical and network. Describing the logical schema, however, still did not describe how physically data would be stored on disk drives. That is the domain of the physical schema . Now logical schemas describe data in terms of relational tables and columns , object oriented classes , and XML tags . A single set of tables, for example can be implemented in dozens of different ways, up to and including the architecture where some rows are on a computer in Cleveland and others are on a computer in Warsaw . This is the physical schema. DEFAULTSORT Physical Schema Category Data management database stub ja ... more details
Unreferenced stub auto yes date December 2009 A Logical Schema is a data model of a specific problem domain expressed in terms of a particular data management technology. Without being specific to a particular database management product, it is in terms of either relational tables and columns, object oriented classes, or XML tags. This is as opposed to a conceptual data model , which describes the semantics of an organization without reference to technology, or a physical data model , which describe the particular physical mechanisms used to capture data in a storage medium. The next step in creating a database , after the logical schema is produced, is to create the physical schema . DEFAULTSORT Logical Schema Category Data management database stub de Schema Informatik ja ru ... more details
database synonym s, database link s, Directory file systems directories , Java , XMLschema s, and other elements. Schemata are generally stored in a data dictionary . Although a schema is defined ...Image Mediawiki dbschema.svg thumb A depiction of MediaWiki database schema. A database schema pronounced ... of database schema is a set of formulas sentences that specify integrity constraints imposed on the database ... conceptual schema are transformed into an explicit mapping, the database schema. This describes how real world entities are modeled in the database. A database schema specifies, based on the database ... of interest to the possible end user s. ref name source3 The notion of a database schema plays ... to a database, which can be seen at any instant of time as a mathematical object . Thus a schema ... source1 In a relational database , the schema defines the Table database tables , Field computer science ... structure. In other words, schema is the structure of the database that defines the objects in the database. In an Oracle Database system, the term schema has a slightly different connotation. For the interpretation used in an Oracle Database, see schema object . Levels of database schema Conceptual schema , a map of concepts and their relationships. Logical schema , a map of entities and their attributes and relations Physical schema , a particular implementation of a logical schemaSchema object , Oracle database object Ideal requirements for schema integration Completeness All information in the source data should be included in the database schema. ref name source2 Overlap preservation Each of the overlapping elements specified in the input mapping is also in a database schema relation ... s overlapping elements are passed through to the database schema. ref name source2 Normalization ... not be grouped together in the same relation in the database schema. In particular, source specific schema elements should not be grouped with overlapping schema elements, if the grouping co locates ... more details
Orphan date February 2009 Context date October 2009 In computer science , schema evolution refers to the problem of evolving a database schema to adapt it to a change in the modeled reality. The problem is not limited to the modification of the schema. It, in fact, affects the data stored under the given schema and the queries and thus the applications posed on that schema. Until recently the design of a database was expected to create a one size fits all schema capable of accepting every future change in the requirements, thus, schema evolution was not considered. This assumption, almost unrealistic ... in traditional settings . ref Cite web url http yellowstone.cs.ucla.edu schema evolution index.php Schema Evolution Benchmark title Schema Evolution Benchmark Schema Evolution publisher yellowstone.cs.ucla.edu accessdate 2010 07 29 ref Due to this historical heritage the process of schema evolution ... is the impact of the schema evolution on queries and applications. As shown in ref name curino iceis2008 ... , journal ICEIS , title Schema Evolution in Wikipedia toward a Web Information System Benchmark , url http carlo.curino.us documents2 curino schema evolution.pdf year To appear 2008 , ref which provides ... operating on the schema, that must be manually reworked consequently. The problem has been recognized ... ref The support for Schema Evolution, is a difficult problem involving complex mapping among schema ... underlying the schema evolution remains almost inaccessible to the large public. Related works A rich bibliography on Schema Evolution is collected at http se pubs.dbs.uni leipzig.de pubs results taxonomy 3A100 UCLA university carried out an analysis of the MediaWiki Schema Evolution http yellowstone.cs.ucla.edu schema evolution index.php Schema Evolution Benchmark Schema Evolution Benchmark PRISM, a tool to support graceful relational schema evolution http yellowstone.cs.ucla.edu schema evolution index.php Schema Evolution Tool Prism schema evolution tool PRIMA, a tool supporting transaction ... more details
Context date October 2009 In database lore, a schema object is a logical Database storage structures data storage structure . ref cite book first1 Lance last1 Ashdown author1 link first2 Tom last2 Kyte ... February publisher Oracle Corporation location isbn quote A database schema is a logical container for data structures, called schema objects. Examples of schema objects are tables and indexes. ref ... s. The term schema can have other meanings when talking about non Oracle databases. This article discusses the Oracle use of the term. For other uses of schema in a database context, such as a graphical representation of tables and other objects in a database, see database schema . In an Oracle database, associated with each database user is a schema. Citation needed date April 2010 A schema comprises a collection of schema objects. Examples of schema objects include Table database tables View ..., non schema objects may include ref cite book first1 Lance last1 Ashdown author1 link first2 Tom ... in a schema. These objects include database users, roles, contexts, and directory objects. ref users roles contexts directory objects Schema objects do not have a one to one correspondence to physical files on disk that store their information. However, Oracle database s store schema objects logically ... can contain objects from different schemas, and the objects for a single schema can be contained ... www.csee.umbc.edu help oracle8 server.815 a67781 c08schem.htm Schema Objects in Oracle 8i Regarding Microsoft Active Directory schema objects Microsoft MSDN http msdn.microsoft.com en us library ms675085 VS.85 .aspx Active Directory Schema Microsoft TechNet http technet.microsoft.com en us library cc739086 WS.10 .aspx Understanding Schema Microsoft TechNet Magazine http technet.microsoft.com en us magazine 2008.05.schema.aspx?pr blog Extending the Active Directory Schema References Reflist DEFAULTSORT Schema Object Category Data modeling soft eng stub ... more details
orphan date February 2010 The Access to Biological Collections Data ABCD schema is a highly structured data exchange and data access access data model model for taxon occurrence data specimens, observations, etc. of living organisms , i.e. primary biodiversity data. External links http www.tdwg.org activities abcd http www.codata.org http www.wfcc.nig.ac.jp NEWSLETTER newsletter36 a6.pdf the ABCD database schema Category Bioinformatics bioinformatics stub DEFAULTSORT Abcd Schema ... more details
The star schema also called star Join SQL join schema , data cube , or multi dimensional schema is the simplest style of data warehouse Logical schemaschema . The star schema consists of one or more fact table s referencing any number of Dimension data warehouse dimension tables . The star schema is considered an important special case of the snowflake schema , and is more effective for handling simpler ... sold. There may be multiple fact tables in a star schema. Dimension tables , which are usually smaller ... dimension or all of them, not on combinations of a few dimensions. Benefits The star schema is a way ... a star schema is its simplicity for users queries are never complex because the only joins and conditions ... to other tables that are possible in a better normalized snowflake schema . Example Image Star schema example.png 300px thumb right Star schema used by example query. Consider a database of sales, perhaps from a store chain, classified by date, store and product. The image of the schema to the right is a star schema version of the sample schema provided in the snowflake schema article. code Fact.Sales ..., relating to one of the columns viewed as rows in the example schema of the code Fact.Sales code table ... reflist See also Snowflake schema External links http ciobriefings.com Publications WhitePapers DesigningtheStarSchemaDatabase tabid 101 Default.aspx Designing the Star Schema Database by Craig Utley http opensourceanalytics.com 2006 04 28 sales data mart dimensional model for retail Star Schema for Retail Sales http c2.com ppr stars.html Stars A Pattern Language for Query Optimized Schema http www.dwoptimize.com 2007 06 aiming for stars.html Star schema optimizations http datawarehouse4u.info Data warehouse schema architecture fact constellation schema.html Fact constellation schema http ... warehouse DEFAULTSORT Star Schema Category Data warehousing Category Data modeling de Sternschema es Esquema en estrella fr toile mod le de donn es ko it Schema a stella ja pt Esquema ... more details
Orphan date February 2009 Dicdef In evolutionary computing such as genetic algorithms and genetic programming , propagation refers to the inheritance of characteristics of one generation by the next. For example, a Schema genetic algorithms schema is propagated if individuals in the current generation match it and so do those in the next generation. Those in the next generation may be but don t have to be children of parents who matched it. References Cite web title Foundation of Genetic Programming url http www.cs.ucl.ac.uk staff W.Langdon FOGP 2002 Cite web title Schema Propagation in Evolution Programs url http www.ubka.uni karlsruhe.de vvv 2005 wiwi 4 4.pdf 2006 Category Evolutionary computation Category Computing terminology Comp sci stub Soft eng stub ... more details
Image Snowflake schema.png 350px thumb right The snowflake schema is a variation of the star schema, featuring normalization of dimension tables. A snowflake schema is a Logical schema logical arrangement ... diagram resembles a snowflake in shape. The snowflake schema is represented by centralized fact table s which are connected to multiple Dimension data warehouse dimensions . The snowflake schema is similar to the star schema . However, in the snowflake schema, dimensions are Normalization database normalized into multiple related tables, whereas the star schema s dimensions are denormalized with each ... of a snowflake schema are elaborate, having multiple levels of relationships, and the child tables ... to employ a star schema or a snowflake schema should consider the relative strengths of the database ... the dimension tables, as compared with a star schema. Some database developers compromise by creating an underlying snowflake schema with View database views built on top of it that perform many of the necessary joins to simulate a star schema. This provides the storage benefits achieved through the normalization of dimensions with the ease of querying that the star schema provides. The tradeoff ... the dimensions will already exist and will typically be normalized. A snowflake schema will therefore be easier to implement. A snowflake schema can sometimes reflect the way in which users think about data. Users may prefer to generate queries using a star schema in some cases, although this may or may ... within a simple star schema. This is particularly common in data mining of customer databases, where ... was first designed. Examples Image Snowflake schema example.png 300px thumb right Snowflake schema used by example query. The example schema shown to the right is a snowflaked version of the star schema example provided in the star schema article. The following example query is the snowflake schema equivalent of the star schema example code which returns the total number of units sold by brand ... more details
The term self schema refers to the beliefs and ideas people have about themselves. These beliefs are used to guide and organize information processing, especially when the information is significant to the self. Self schemas are important to a person s overall self concept . General self schema The term schematic describes having a particular schema for a particular dimension. For instance, a person in a musical ensemble rock band at night, when she would have a rocker schema. However, during the day, if she works as a sales person, she would have a salesperson schema during that period of time. Schemas vary according to culture cultural background and other social environment environmental factors . Once people have developed a schema about themselves, there is a strong tendency for that schema ... they are prepared to accept as true about themselves. In other words, the self schema becomes self perpetuating. The self schema is then stored in long term memory , and both facilitates and biases the processing of personally relevant information. The term aschematic means not having a schema ... a certain attribute. For example, if a person plans on being a music ian, a self schema in aeronautics ... or active and geek or jock . If a person has a schema for geek or jock , for example, he might think ... geek. Another person with the health y or illness sickly schema might consider herself a very health ... mood than did those who are aschematic on appearance. Multiple self schema Most people have multiple ... maltreated children The role of self schema. Development and Psychopathology, 20 1 , 213 32. Retrieved ... 2003 . Body Image, Appearance Self Schema, and Media Images. Family and Consumer Sciences Research .... Bartoli, Angela 2008, Jan. 14 . Self schema. Retrieved March 3, 2009, from Angela M. Bartolli, Psychology Web site http webspace.ship.edu ambart PSY 220 selfschemaol.htm 3 S, 2003 . What is a self schema?. Retrieved March 3, 2009, from The Spiritual Self Schema Development Program Web site http info.med.yale.edu ... more details
In mathematical logic , an axiom schema plural axiom schemata generalizes the notion of axiom . An axiom schema is a well formed formula formula in the language of an axiomatic system , in which one or more schematic variable s appear. These variables, which are metalinguistic constructs, stand for any First order logic Formation rules term or first order logic subformula of the system, which may or may not be required to satisfy certain conditions. Often, such conditions require that certain variables be free variable free , or that certain variables not appear in the subformula or term. Given that the number of possible subformulas or terms that can be inserted in place of a schematic variable is countably infinite , an axiom schema stands for a countably infinite set of axioms. This set can usually be defined recursive ly. A theory that can be axiomatized without schemata is said to be finitely axiomatized . Theories that can be finitely axiomatized are seen as a bit more metamathematically elegant, even if they are less practical for deductive work. Two very well known instances of axiom schemata are the Mathematical induction Induction schema that is part of Peano s axioms for the arithmetic of the natural number s Axiom schema of replacement that is part of the standard ZFC axiomatization of set theory . It has been proved first by Richard Montague that these schemata cannot be eliminated. Hence Peano arithmetic and ZFC cannot be finitely axiomatized. This is also the case for quite a few other axiomatic theories in mathematics, philosophy, linguistics, etc. All theorems of ZFC are also theorems of von Neumann Bernays G del set theory , but the latter is, quite surprisingly ... over all possible properties or relations. References sep entry schemaSchema John Corcoran 2008 09 21 Corcoran, J. 2006. Schemata the Concept of Schema in the History of Logic. Bulletin of Symbolic ... axioms Category Formal systems it Schema di assiomi nl Axiomaschema ja zh ... more details
A schema pl. schemata or schemas , in psychology and cognitive science , describes any of several concepts ... and are used for interpreting and processing information. A schema for oneself is called a self schema . Schemata for other people are called person schemata . Schemata for roles or occupations ... . Schemata influence our attention, as we are more likely to notice things that fit into our schema. If something contradicts our schema, it may be encoded or interpreted as an exception or as unique ... people who do not fit our schema in a special or different category, rather than to consider the possibility that our schema may be faulty. As a result of schemata, we might act in such a way that actually ... one s understanding of the world. Schema theory was developed by the educational psychologist R. C. Anderson. The term schema was used by Jean Piaget in 1926, so it was not an entirely new concept .... History of schema theory Early developments of the idea in psychology emerged with the Gestalt psychology ... people have a stairway schema and can apply it to climb staircases they ve never seen before. However ... in terms of his her schema. For example, if a well dressed businessman draws a knife on a vagrant ... thought to have a level of activation, which can spread among related schemata. Which schema ... priming . Accessibility is how easily a schema comes to mind, and is determined by personal experience ... temporarily provides enough activation to a schema so that it is used for subsequent ambiguous information ... they interpret schema foreign new information but also how they recall the information over time. One ... of schemata was conducted by Brewer and Treyens 1981 who demonstrated that the schema driven expectation ... s schema is easily remembered and incorporated into their worldview . However, when new information is perceived that does not fit a schema, many things can happen. The most common reaction is to simply ... is seen, a person will probably just assimilate it into their dog schema. However, if the dog behaves ... more details
Context date October 2009 The terms schema matching and Data mapping mapping are often used interchangeably. For this article, we differentiate the two as follows database schemaSchema matching is the process ... and often not explicated or documented semantics of the two schemas. Impediments to Schema Matching Missing image removed Image conflicts1.jpg thumb 300px right Figure 1 Schema and data conflict classification ... the same information schema conflicts OR different expressions, units, and precision result in conflicting representations of the same data data conflicts . ref name kim see Figure 1 Research in schema ... is represented synonym using different terms or homonym vice versa Schema Matching Image SurveySchemaMatching.jpg thumb 400px left Figure 2 Classification of schema matching approaches ref name rahm cite conference author Rahm, E. and Bernstein, P title A survey of approaches to automatic schema matching booktitle The VLDB Journal 10, 4 year 2001 ref Comprehensive surveys of automatic schema matching ..., M., and Navathe, S. B. title A comparative analysis of methodologies for database schema integration ... of schema integration or the activities involved. According to the authors, one can view the integration ... Now the schemas are ready to be superimposed, giving rise to some intermediate integrated schema ... desirable qualities. blockquote Approaches Approaches to schema integration can be broadly classified as ones that exploit either just schema information or schema and instance level information see Figure 2 and ref name rahm and ref name batini for a list of prototypes Schema level matchers only consider schema information, not instance data. The available information includes the usual properties of schema elements, such as name, description, data type, relationship types part of, is a, etc. , constraints, and schema structure. Working at the element atomic elements like attributes of objects ... matchers use names and text i.e., words or sentences to find semantically similar schema elements. Constraint ... more details
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