The term multiplicity refers to a specification of the number of values that can be present with regard to a given element For an association, multiplicity refers to the number of each association end that can be connected to that association via links For an attribute, multiplicity refers to the number of values that the attribute can assume within its enclosing object For a class, multiplicity refers to the number of instances that class can have Multiplicity can be an explicit value, a range of explicit values, or an expression that resolves to one value or a range of values
A multiplicity of things is a large number or a large variety of them. a writer who uses a multiplicity of styles. = many. a large number or great variety of things multiplicity of (multiplicitas, from multiplex; MULTIPLEX)
attribute of Role: Multiplicity How many instances of the attached class may be associated with a single instance of the object on the other end of the association (meaningful only for binary associations) The value is a set of nonoverlapping ranges on the non-negative integers extended with the value "many" which indicates an unbounded number
A specification of the range of allowable cardinalities that a set may assume Multiplicity specifications may be given for roles within associations, parts within composites, repetitions, and other purposes Essentially a multiplicity is a (possibly infinite) subset of the non-negative integers Contrast: cardinality
Multiplicity refers to a set of values (all non-negative integers, plus infinity) that can be used to describe cardinality PDL uses a Multiplicity to specify the relationship between objects within Associations Specifically, it can be used to answer the question, "given an object of type A, what is the range of number of objects of type B that can be related to A?" The syntax used is "[# #]" where # is either "0", "1", or "n" The valid multiplicities are "[0 1]" (there may or may not be a single associated object), "[0 n]" (there may be zero to n associated objects), and "[1 1]" (there is always exactly one object related to the given object) The Multiplicities with an upper bound of "n" are typically used when there is a mapping table involved The Multiplicity of "[1 1]" is typically used when there is a non-null, single column in the table referencing another table If no multiplicity is specified, "[0 1]" is used as the default
The UML term for signifying the quantities involved in an association It is displayed on an association line with a minimum value,an ellipses ( ),and a maximum value or asterisk (*)for many For example,a customer can place from zero to many orders,so the multiplicity is (0 *)