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Concept:
Data composition
Headline
Composition of compound data from parts
Note
Data composition is not an established term, but it naturally arises as a generalization of existing notions that are used in data modeling and programming. A common form of data composition is object composition, which is actually sometimes also defined in a broad enough sense, not to be limited to objects in the sense of OO programming. For clarity, the general term data composition is used on this wiki, whenever appropriate.
Description
Data composition entails component entities (e.g., primitive data or previously composed data) and compound entities (e.g., objects, tuples, or records). Composition means that the components (say, the parts) are combined to form a compound (say, a whole). A principle means of going beyond data composition is to leverage data variation.
Illustration
The following Language:Haskell-based data model for the @system leverages data composition systematically. The data model is based on algebraic data types. The data types for companies, departments, and employees declare a single constructor to serve for data composition. Basic types for numbers and strings are used for some components. List types are also used.
data Company = Company Name [Department]
data Department = Department Name Manager [Department] [Employee]
data Employee = Employee Name Address Salary
type Manager = Employee
type Name = String
type Address = String
type Salary = Float
The snippet originates from Contribution:haskellComposition.
Backlinks
Contribution:haskellVariation
Contribution:haskellComposition
Script:Data modeling in Haskell
Contribution:jsSyb
Contribution:fsharpClasses
Contribution:pythonSyb
Feature:Hierarchical company
Concept:Data variation
Concept:Data composition
Contribution:fsharpRecords
Contribution:haskellStarter
Theme:Haskell data
Concept:Haskell data
Concept:Basic data modeling in Haskell
Concept:Data modeling in Haskell
Course:Lambdas at UvA
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For you are available next options:will make text bold.
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will allow you to paste code with syntax highlight into the page. You will need to define used programming language.
will allow you to paste image into the page.
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