L

last

The term last refers to an OCL operation that returns the last element in a given Sequence.
 

layer

Within the Unified Process, a layer is a set of subsystems that share the same degree of generality and interface volatility.

Within a layered architecture, the lower layers tend to be general to several applications, and thus must have relatively stable interfaces, while higher layers tend to be more application-specific and may have less stable interfaces as a result.
 

leaf

A leaf is a generalizable element that has no children in a given generalization hierarchy.

let expression

A let expression is an OCL expression that allows one to define an attribute or operation that can be used within one or more constraints.
 

library

A library is a stereotype attached to an artifact to signify a file that contains a static or dynamic object library (for instance, a Windows Dynamic Link Library [DLL]).
 

life-cycle architecture

Within the Unified Process, the term life-cycle architecture refers to the major milestone that concludes the Elaboration phase.
 

life-cycle objectives

Within the Unified Process, the term life-cycle objectives refers to the major milestone that concludes the Inception phase.
 

lifeline

A lifeline is a named element that represents the participation of a given connectable element in a particular interaction.
 

link

A link is an instance of an association that represents a connection among two or more objects.

link action

A link action is an action that involves a specified link or link object.

There are two kinds of link actions: read link actions and write link actions.
 

link end

A link end is an instance of an association end.

link end creation data

The term link end creation data refers to a link end data entity that identifies one end of a link that will be created by a create link action or a create link object action.
 

link end data

A link end data entity is a specification of a connection among an input pin, an association end, and the possible values of a qualifier attached to the association end.

A link end creation data entity is a special kind of link end data entity.
 

link object

A link object is a link that has a set of attribute values.

A link object is basically an instance of an association class.
 

list

A list is an ordered collection, of variable length, of model elements owned by, and nested within, another model element.
 

literal Boolean

A literal Boolean is a literal specification of a Boolean value.
 

literal integer

A literal Boolean is a literal specification of an integer value.
 

literal null

A literal Boolean is a literal specification of the absence of a value.
 

literal specification

A literal specification is a specification of a literal constant.

There are five kinds of literal specifications:

	literal Boolean
	literal integer
	literal null
	literal string
	literal unlimited natural

literal string

A literal Boolean is a literal specification of a string value.
 

literal unlimited natural

A literal Boolean is a literal specification of an unlimited natural number, which takes the form of a sequence of digits or * (many).
 

local postcondition

A local postcondition is a constraint that must hold true after a given action execution completes.
 

local precondition

A local precondition is a constraint that must hold true before a given action execution begins.
 

location reference

A location reference is a position within a behavioral sequence, such as a use case or a state machine, at which an extended use case appears.
 

loop node

A loop node is a structured activity node that represents a loop with setup, test, and body sections. The setup section is executed once on entry to the loop; the test and body sections are executed repeatedly until the test produces False.
 

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