Data item

Data item

A data item[1] describes an atomic state[2] of a particular object concerning a specific property at a certain time point. A collection of data items for the same object at the same time forms an object instance (or table row). Any type of complex information can be broken down to elementary data items (atomic state). Data items are identified by object (o), property (p) and time (t), while the value (v) is a function of o, p and t: v = F(o,p,t).

Values typically are represented by symbols like numbers, texts, images, sounds, videos or others. Values are not necessarily atomic. The complexity of a value depends on the complexity of the property and time component.

When looking at databases or XML files, the object is usually identified by an object name or other type of object identifier, which is part of the "data". Properties are defined as columns (table row), properties (object instance) or tags (XML). Often, time is not explicitly expressed and is an attribute applying to the complete data set. Other data collections provide time on the instance level (time series), on column level or even on attribute/property level.

References

  1. ^ http://www1.unece.org/stat/platform/download/attachments/14319930/Neuchatel+Model+V1.pdf?version=1 Neuchâtel Terminology Model PART II: Variables and related concepts
  2. ^ Karge, R. (July 2003). "Unified Database Theory" (PDF). The 7th World Multi-Conference on SYSTEMICS, CYBERNETICS AND INFORMATICS - SCI 2003. Orlando, Florida (USA). http://www.odaba.com/content/downloads/documentation/P1_UnifiedDatabaseTheory.pdf. 

Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Data Item —   [engl.], Datenelement …   Universal-Lexikon

  • data item — duomenų elementas statusas T sritis automatika atitikmenys: angl. data element; data item; data unit vok. Dateneinheit, f; Datenelement, n; Datenwort, n rus. единица данных, f; элемент данных, m pranc. position élémentaire des données, f …   Automatikos terminų žodynas

  • data item — A subunit of descriptive information or value classified under a data element. For example, the data element “military personnel grade” contains data items such as sergeant, captain, and colonel …   Military dictionary

  • Data item — Элемент данных …   Краткий толковый словарь по полиграфии

  • Data integrity — in its broadest meaning refers to the trustworthiness of system resources over their entire life cycle. In more analytic terms, it is the representational faithfulness of information to the true state of the object that the information represents …   Wikipedia

  • Data Intensive Computing — is a class of parallel computing applications which use a data parallel approach to processing large volumes of data typically terabytes or petabytes in size and typically referred to as Big Data. Computing applications which devote most of their …   Wikipedia

  • data synchronization — noun a) The establishment of equivalence between data collections (typically on different servers), where each data element in one item maps to a data item in the other, and their data is equivalent. b) (computing between trading partners) Data… …   Wiktionary

  • Data validation — In computer science, data validation is the process of ensuring that a program operates on clean, correct and useful data. It uses routines, often called validation rules or check routines , that check for correctness, meaningfulness, and… …   Wikipedia

  • Data stream — This article is about the more general meaning of the term data stream . For the UK specific DSL technology, see Datastream. In telecommunications and computing, a data stream is a sequence of digitally encoded coherent signals (packets of data… …   Wikipedia

  • Data event — A data event is a relevant state transition defined in an event schema[1]. Typically, event schemata are described by pre and post condition for a single or a set of data items. In contrast to ECA (Event condition action), which considers an… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”