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Was (wer) ist Content Data Model - definition
A DATA MODEL FOR CERTAIN XML MARKUP LANGUAGES, IN COMPUTING
XPath data model; Xpath data model
Data model (GIS)
WAY OF REPRESENTING GEOGRAPHICAL INFORMATION
Data model (ArcGIS); Geographic data model; GIS data model
A geographic data model, geospatial data model, or simply data model in the context of geographic information systems, is a mathematical and digital structure for representing phenomena over the Earth. Generally, such data models represent various aspects of these phenomena by means of geographic data, including spatial locations, attributes, change over time, and identity.
data model
![How data models deliver benefit<ref name="MW99">Matthew West and Julian Fowler (1999). [https://sites.google.com/site/drmatthewwest/publications/princ03.pdf Developing High Quality Data Models]. The European Process Industries STEP Technical Liaison Executive (EPISTLE).</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/3-4 Data model roles.svg?width=200 "How data models deliver benefit<ref name=\"MW99\">Matthew West and Julian Fowler (1999). [https://sites.google.com/site/drmatthewwest/publications/princ03.pdf Developing High Quality Data Models]. The European Process Industries STEP Technical Liaison Executive (EPISTLE).</ref>")
![three level architecture]]. This shows that a data model can be an external model (or view), a conceptual model, or a physical model. This is not the only way to look at data models, but it is a useful way, particularly when comparing models.<ref name="MW99"/>](https://commons.wikimedia.org/wiki/Special:FilePath/4-2 ANSI-SPARC three level architecture.svg?width=200 "three level architecture]]. This shows that a data model can be an external model (or view), a conceptual model, or a physical model. This is not the only way to look at data models, but it is a useful way, particularly when comparing models.<ref name=\"MW99\"/>")
![EXPRESS G]] [[Information model]]](https://commons.wikimedia.org/wiki/Special:FilePath/A 01 Audio compact disc collection.svg?width=200 "EXPRESS G]] [[Information model]]")
![A [[binary tree]], a simple type of branching linked data structure](https://commons.wikimedia.org/wiki/Special:FilePath/Binary tree.svg?width=200 "A [[binary tree]], a simple type of branching linked data structure")
![Data-Flow Diagram example<ref>John Azzolini (2000). [http://ses.gsfc.nasa.gov/ses_data_2000/000712_Azzolini.ppt Introduction to Systems Engineering Practices]. July 2000.</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/Data Flow Diagram Example.jpg?width=200 "Data-Flow Diagram example<ref>John Azzolini (2000). [http://ses.gsfc.nasa.gov/ses_data_2000/000712_Azzolini.ppt Introduction to Systems Engineering Practices]. July 2000.</ref>")
![[[Document Object Model]], a standard [[object model]] for representing [[HTML]] or [[XML]]](https://commons.wikimedia.org/wiki/Special:FilePath/JKDOM.SVG?width=200 "[[Document Object Model]], a standard [[object model]] for representing [[HTML]] or [[XML]]")
![Example of the application of Object-Role Modeling in a "Schema for Geologic Surface", Stephen M. Richard (1999)<ref name="SMR99">Stephen M. Richard (1999). [http://pubs.usgs.gov/of/1999/of99-386/richard.html Geologic Concept Modeling]. U.S. Geological Survey Open-File Report 99-386.</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/Schema for Geologic Surface.svg?width=200 "Example of the application of Object-Role Modeling in a \"Schema for Geologic Surface\", Stephen M. Richard (1999)<ref name=\"SMR99\">Stephen M. Richard (1999). [http://pubs.usgs.gov/of/1999/of99-386/richard.html Geologic Concept Modeling]. U.S. Geological Survey Open-File Report 99-386.</ref>")
![Flat model]]](https://commons.wikimedia.org/wiki/Special:FilePath/FigFileConvert000a.svg?width=200 "Flat model]]")
![[[Hierarchical model]]](https://commons.wikimedia.org/wiki/Special:FilePath/Hierarchisches Datenbankmodell.svg?width=200 "[[Hierarchical model]]")
![[[Network model]]](https://commons.wikimedia.org/wiki/Special:FilePath/Network DB model.svg?width=200 "[[Network model]]")
![[[Relational model]]](https://commons.wikimedia.org/wiki/Special:FilePath/Relational model concepts.png?width=200 "[[Relational model]]")
![[[Star schema]]](https://commons.wikimedia.org/wiki/Special:FilePath/Star-schema.png?width=200 "[[Star schema]]")
![Groups relate to process of making a mapDavid R. Soller1 and Thomas M. Berg (2003). [http://pubs.usgs.gov/of/2003/of03-471/soller1/index.html The National Geologic Map Database Project: Overview and Progress] U.S. Geological Survey Open-File Report 03–471.](https://commons.wikimedia.org/wiki/Special:FilePath/Groups relate to the process of making a map.jpg?width=200 "Groups relate to process of making a mapDavid R. Soller1 and Thomas M. Berg (2003). [http://pubs.usgs.gov/of/2003/of03-471/soller1/index.html The National Geologic Map Database Project: Overview and Progress] U.S. Geological Survey Open-File Report 03–471.")
![[[Hash table]]](https://commons.wikimedia.org/wiki/Special:FilePath/HASHTB08 en.svg?width=200 "[[Hash table]]")
![[[Linked list]]](https://commons.wikimedia.org/wiki/Special:FilePath/Singly linked list insert after.png?width=200 "[[Linked list]]")
![[[Stack (data structure)]]](https://commons.wikimedia.org/wiki/Special:FilePath/Data stack.svg?width=200 "[[Stack (data structure)]]")
AN ABSTRACT MODEL THAT ORGANIZES ELEMENTS OF DATA AND STANDARDIZES HOW THEY RELATE TO ONE ANOTHER AND TO REAL WORLD ENTITIES.
Data Model; Structured data; Data model diagram; Data models; Datamodel; History of data modeling; Datamodels
<database> The product of the database design process which
aims to identify and organize the required data logically and
physically.
A data model says what information is to be contained in a
database, how the information will be used, and how the items
in the database will be related to each other.
For example, a data model might specify that a customer is
represented by a customer name and credit card number and a
product as a product code and price, and that there is a
one-to-many relation between a customer and a product.
It can be difficult to change a database layout once code has
been written and data inserted. A well thought-out data model
reduces the need for such changes. Data modelling enhances
application maintainability and future systems may re-use
parts of existing models, which should lower development
costs.
A data modelling language is a mathematical formalism with a
notation for describing data structures and a set of
operations used to manipulate and validate that data.
One of the most widely used methods for developing data models
is the entity-relationship model. The relational model is
the most widely used type of data model. Another example is
NIAM.
["Principles of Database and Knowledge-Base Systems",
J.D. Ullman, Volume I, Computer Science Press, 1988, p. 32 ].
(2000-06-24)
Wikipedia
XQuery and XPath Data Model
The XQuery and XPath Data Model (XDM) is the data model shared by the XPath 2.0, XSLT 2.0, XQuery, and XForms programming languages. It is defined in a W3C recommendation. Originally, it was based on the XPath 1.0 data model which in turn is based on the XML Information Set.
The XDM consists of flat sequences of zero or more items which can be typed or untyped, and are either atomic values or XML nodes (of seven kinds: document, element, attribute, text, namespace, processing instruction, and comment). Instances of the XDM can optionally be XML schema-validated.
