Abstraction is principle of ignoring those aspects of a subject that are not relevant to the current purpose in order to concentrate more fully on those that are.

Action is an executable atomic computation that results in a change in state of the system or the return of the value.

Activity (method) is any group of regulated (proceeding) nonatomic operations, which should be executed in order to accomplish certain task.

Actor represents a role a user can play with regard to a system, or an entity such as database or another system, which resides outside the system or business being modeled.

Analysis is a process of continual learning about the nuances of problem domain and the system responsibilities.

Application represents manipulation and processing of data in support of user requirements.

Application schema is conceptual schema for data required by one or more applications.

Attribute is some property for which each object in a class has its own value (data).

Class is a formal description of one or a set of objects with a uniform set of attributes and functions (services), including a description of how to create new objects in the class.

Conceptual modeling (also information modeling) means the process of abstracting and classifying real word objects of the selected part of reality into the constructs that can be represented like classes in the computer or information system database.

Conceptual formalism is set of modeling concepts used to describe a conceptual model. The conceptual formalism provides the rules, constraints, inheritance mechanisms, events, activities and other elements that make up a conceptual schema language. Conceptual formalism can be expressed in several conceptual schema languages.

Conceptual model defines concepts of a universe of discourse. Conceptual model provides the abstract description of the selected real-world features.

Conceptual schema is formal description of a conceptual model in conceptual schema language. The conceptual schema is a rigorous description of a conceptual model for some universe of discourse. A conceptual schema language is based upon a conceptual formalism.

Conceptual schema language is formal description technique used, which bases on a conceptual formalism for the purpose of representing conceptual schemas. A conceptual schema language provides the semantic and syntactic elements used to describe the conceptual model rigorously in order to convey meaning consistently. A conceptual schema language may be lexical or graphical or both.

Data model represents the abstract notion and conceptual interpretation of facts or knowledge for the portion of the complex real world and regarding the particular application in mind.

Dataset is identifiable collection of data.

Domain is real, abstract or hypothetical field of endeavor under consideration, which can include various groups of objects that behave accordingly to the rules and characteristics of this domain.

Dynamic model describes the system regarding its subsistence, stability and variations trough time.

Feature is an abstraction of real world phenomena. A feature may occur as a type (class) or an instance (object).

Feature attribute is an important characteristic of a feature. A feature attribute has a name, a data type, and a value domain associated to it.

Feature catalogue (objects catalogue) is a catalogue containing definitions and descriptions of the feature types, feature attributes, and feature relationships occurring in one or more sets of geographic data, together with any feature operations that may be applied.

Feature operation (method) is an activity that every instance of a feature type may perform.

Function is a synonym for service and is a constituting part of a process. Function consists of an activity or a set of activities, which that process must perform.

Geographic information service is an activity that transforms, manages, or presents geographic data to users.

Geographic information system (GIS) is the combination of skilled persons, spatial and descriptive data, analytical methods, computer software and hardware that are organized to manage and automatically process data with the aim to deliver information through the geographic data presentation.

Information system is a combination of database, human and technical resources that together with the appropriate organization skills produce information needed to support certain economic activity, management of resources and/or decision-making procedures.

Land cadastre is a public and systematic registration of land parcels for a certain administrative unit (cadastral jurisdiction). The basic role of land cadastre is identification of real estate properties in space. Therefore it forms the basic technical support for the operation of the land registry. Delineation of parcels is based on measured boundary points and lines.

Land registry is public database of titles on properties that are divided on real rights (ownership and usage), encumbrances (easements and mortgage) and obligatory rights (leasehold, tenancy, rent, redemption etc.), their changes and legal status.

Message is a selection of one of the class functions that an object knows how to perform.

Metadata is data on data or its interpretation, which describes its technical and administrative characteristics.

Metadata schema is a conceptual schema describing metadata.

Metamodel is model’s model that serves for explanation and definition of relationships among the various components of the applied model itself.

Methodology is a set of rules, methods and practical procedures that are used in the specific science or technological discipline. Methodology is science about methods.

Model is applied an abstract supplement, which is formed of descriptive and/or graphical specification of the selected part of reality, and represents simplified mapping of physical environment into the conceived and interpreted notion. Models help to understand, learn and shape both the problem and its solution domain.

Nominal ground is the view of the real world implied by the specification of the geographic dataset. The nominal ground forms the ideal geographic dataset to which the actual geographic dataset is compared regarding to their location, thematic and temporal attributes.

Object is anything in a problem domain, real or abstract, reflecting the capabilities of a system to keep data about it and interacts with it. Each object is an instance of particular abstract object type or class.

Object type is a collection of objects, which can be described with the same attributes (data), services (processing behavior) and relationships. The realization of object type is a class.

Parcel is a set of lots that are all the subject matter of a unit of real estate.

Problem domain is the area of consideration that encompasses real world features and concepts related to the problem, which the system is being designed to solve.

Process is a flow of development in which something is forming, acting or changing. Process can be regarded as an application of a method in a certain industrial activity that is going on in the real environment.

Quality schema is a conceptual schema defining aspects of quality for geographic data.

Reality is considered as an infinite space and time, which we conceive as the complex physical actuality that surrounds us and constantly changes.

Responsibility is the condition, quality, fact or instance of being accountable, answerable or liable, as for a person, trust, service, office or debt.

Schema is a formal description of a model.

Service is a synonym for function and is a specific processing activity or a set of activities that an object is responsible for exhibiting.

State is a condition or situation during the life of an object or performance of an information system, during which it satisfies some condition, performs some activity or waits for some event.

Structure is the manner of organization, and is an expression of problem domain complexity, which is pertinent to the system’s responsibilities.

System is structured arrangement of elements or mechanisms that are related or connected as to form unity, in order to achieve their efficient functionality.

System analysis is a combined process dissecting the system responsibilities that are based on the problem domain characteristics and users’ requirements.

System requirements are an arrangement of things accountable and related together as a whole that represent all the responsibilities the system must manifest and fulfill.

Universe of discourse is a view of the real or hypothetical world that includes everything of interest. A universe of discourse is described in a conceptual model and formally specified in the conceptual schemas.

Use case is a sequence of actions that an actor (a person, external entity or another system) performs within a system to achieve a particular goal. Or from inside out, a use case is a sequence of actions a system executes that yield observable results of value to a particular actor. A use case specification contains the main, alternate and the exception flows or paths.

Copied from section 9 of Radoš Šumrada ( The Internal and External Views of Cadastral Information Systems by Erik Stubkjær,, 2001-10-25