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The onion model is a
The onion model in computing is used as a metaphor for the complex structure of information systems. The system is split into layers to make it easier to understand.https://www.slideshare.net/MdRokibulIslam2/mis-management-information-system-lecture-1 A simple example is to start with the program, operating system and hardware layers. Each of these layers can then be subdivided.
The onion model is a graph
Graph may refer to:
Mathematics
*Graph (discrete mathematics), a structure made of vertices and edges
**Graph theory, the study of such graphs and their properties
*Graph (topology), a topological space resembling a graph in the sense of discre ...
-based diagram
A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since prehistoric times on walls of caves, but became more prevalent during the Enlightenment. Sometimes, the technique uses a three ...
and conceptual model for describing relationships among levels of a hierarchy, evoking a metaphor
A metaphor is a figure of speech that, for rhetorical effect, directly refers to one thing by mentioning another. It may provide (or obscure) clarity or identify hidden similarities between two different ideas. Metaphors are often compared wi ...
of the layered "shells" exposed when an onion
An onion (''Allium cepa'' L., from Latin ''cepa'' meaning "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus '' Allium''. The shallot is a botanical variety of the on ...
(or other concentric assembly of spheroid
A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters. A spheroid has ...
al objects) is bisected by a plane that intersects the center or the innermost shell. The outer layers in the model typically add size and/or complexity, incrementally, around the inner layers they enclose.
An onion diagram can be represented as an Euler
Leonhard Euler ( , ; 15 April 170718 September 1783) was a Swiss mathematician, physicist, astronomer, geographer, logician and engineer who founded the studies of graph theory and topology and made pioneering and influential discoveries in ...
or Venn
Venn is a surname and a given name. It may refer to:
Given name
* Venn Eyre (died 1777), Archdeacon of Carlisle, Cumbria, England
* Venn Pilcher (1879–1961), Anglican bishop, writer, and translator of hymns
* Venn Young (1929–1993), New Ze ...
diagram composed of a hierarchy of set
Set, The Set, SET or SETS may refer to:
Science, technology, and mathematics Mathematics
*Set (mathematics), a collection of elements
*Category of sets, the category whose objects and morphisms are sets and total functions, respectively
Electro ...
s, A1...Ak (but perhaps potentially or conceptually infinite) where each set An+1 is a strict subset
In mathematics, set ''A'' is a subset of a set ''B'' if all elements of ''A'' are also elements of ''B''; ''B'' is then a superset of ''A''. It is possible for ''A'' and ''B'' to be equal; if they are unequal, then ''A'' is a proper subset of ...
of An (and by recursion, of all Am where in each case m > n). (Some applications of the concept, however, may fail to benefit from the mathematical and otherwise rigorous properties of the model.)
Such formats supported by Microsoft PowerPoint
Microsoft PowerPoint is a presentation program, created by Robert Gaskins and Dennis Austin at a software company named Forethought, Inc. It was released on April 20, 1987, initially for Macintosh computers only. Microsoft acquired Power ...
's SmartArt wizard invoke the term "stacked Venn".
In computing
The onion model in computing is used as a metaphor for the complex structure of information systems. The system is split into layers to make it easier to understand.https://www.slideshare.net/MdRokibulIslam2/mis-management-information-system-lecture-1 A simple example is to start with the program, operating system and hardware layers. Each of these layers can then be subdivided.
See also
* *Matryoshka doll
Matryoshka dolls ( ; rus, матрёшка, p=mɐˈtrʲɵʂkə, a=Ru-матрёшка.ogg), also known as stacking dolls, nesting dolls, Russian tea dolls, or Russian dolls, are a set of wooden dolls of decreasing size placed one inside ano ...
*
*
References