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An entity–attribute–value model (EAV) is a data model optimized for the space-efficient storage of sparse—or ad-hoc—property or data values, intended for situations where runtime usage patterns are arbitrary, subject to user variation, or otherwise unforeseeable using a fixed design. The use-case targets applications which offer a large ...
Example of a web form with name-value pairs. A name–value pair, also called an attribute–value pair, key–value pair, or field–value pair, is a fundamental data representation in computing systems and applications. Designers often desire an open-ended data structure that allows for future extension without modifying existing code or data.
"The so-called open schema solution is quite popular. In this solution, you have the main Products table with common attributes. Then you add an Entity-Attribute-Value (EAV) table, which has three columns: product ID, attribute name, and attribute value. This is a completely dynamic solution, and is quite simple.
There is one required positional parameter for the value, and four optional params: three for styling the display, and one replacement parameter for dealing with how to render a blank space: |1= – the value to be highlighted; required (no default) |border= – may be used to set border attributes. default: thin solid #caa. Alias: |b=.
EAV may refer to: East Atlanta Village, in Atlanta, Georgia; Electroacupuncture, an alternative medicine diagnostic device; Equine arteritis virus, the causal agent of equine viral arteritis; Entity–attribute–value model, a data model; Erste Allgemeine Verunsicherung, an Austrian band; Expired air ventilation; Exposure action value
In general, an attribute–value system may contain any kind of data, numeric or otherwise. An attribute–value system is distinguished from a simple "feature list" representation in that each feature in an attribute–value system may possess a range of values (e.g., feature P 1 below, which has domain of {0,1,2}), rather than simply being ...
MediaWiki supports most CSS, with such exceptions as the url() attribute. There were some bugs in CSS support in earlier versions. Further information: the Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification
Inline styles are CSS style assignments that have been applied to an element using the style attribute. You can examine and set these styles by retrieving the style object for an individual element. For example, to highlight the text in a heading when the user moves the mouse pointer over it, you can use the style object to enlarge the font and ...