Terms and definitions used throughout the NBS BIM Object Standard are generally as defined in PAS 1192-2 and PAS 1192-3. In addition, the following apply:
A collection of objects to form a system.
PAS 1192-2: A group of components or types to enable the reuse of standardised design or specification elements improving productivity of design and delivery as well as providing a location to hold specifications and lessons learnt in a simple and useable way.
|BIM Platform||Application that is usually used in design for generating data for multiple uses. Examples include Autodesk® Revit®, Bentley AECOsim, Graphisoft ArchiCAD, Nemetscheck Vectorworks and Tekla Structures.|
|COBie (Construction Operation Building information exchange)||A subset of BS ISO 16739 IFC documented as a BuildingSMART model view definition (MVD) which includes operational information. The definition of COBie is maintained by BuildingSMART Alliance and BuildingSMART UKI.
See also FM Basic Handover Model View Definition (MVD).
|Code (BS 1192)||Sequence of characters, often a mnemonic, having a defined meaning when interpreted in the context of the field in which it is entered; used to convey metadata concisely.|
An individual object that has unique geometry and does not rely on any other objects to be understood. It carries information about its identity, appearance, performance and usage. Can also carry behavioural information. The object has unique geometry ranging from simple to highly complex.
A component may contain a number of variants to its parameters; however, any variation to the geometry of a component constitutes a new object. For example, a door, chair or light fitting.
Note: A component object:
Component objects are typically inserted and moved/rotated into the required position.
The term component is sometimes referred to as instance, occurrence or element.
|Components||Specific instances of each type, that may require management such as inspection, maintenance, service or replacement during in ‘in-use’ phase.|
IFC: Restriction for a specified reason.
Consists of elements defined by technical function, form and/or position such as walls and roofs, ventilation and electrical power supply.
Construction entities are the basic units of the built environment and together form, e.g. buildings, landscape, roads and dams.
See also Object.
|Information resource of interest in a construction process. Includes general reference information as well as project information, e.g. BIM, scale models, drawings, diagrams, calculations, specifications.|
|Object of interest in the context of a construction process.
See also Object.
ISO 12006-2: A product intended to be used as a construction resource.
IFC defines a product as a physical object (manufactured, supplied or created) for incorporating into a project. It may be physically existing or tangible.
A product may be defined by shape representations and have a location in the coordinate space.
|A construction object used in a construction process to achieve a construction result.|
|Container (BS 1192)||Named persistent set of data within a file system or application data storage hierarchy including, but not limited to, directory, sub-directory, data file, or district sub-set of a data file, such as a chapter or section, layers or symbol.|
|Container file||Repository used to compile assemblies and components for specific purposes, including export and publication.|
|Convention (BS 8541-2)||Accepted way of drawing an item which may have the nature of a representation, a simplified representation or a symbol.|
(defined, enumeration and select)
BS ISO 29481-1
|Named types of data that may be used, including labels, text descriptions, identifiers, enumerated ranges of possible values from which a selection should be made for alternative routing through a schema.|
‘Documentation View’ includes, tabular, schedules, cost estimations, thermal calculations, performance reports’.
See also view type.
|Digital Plan of Works||
Digital Plan of Works (dPoW) Schedule of phases, roles, responsibilities, assets and attributes, made available in a computable form.
See also RIBA Plan of Works 2013.
|Enumeration (IFC)||Construction that allows an attribute value to be one of multiple predefined values identified by name.|
|External reference (IFC)||Link to information outside the data set, with direct relevance to the specific information the link originates from inside the data set.|
|Field (BS 1192)||Part of a container name reserved for metadata.|
|FM Basic Handover Model View
An IFC View Definition, or FM Handover Model View Definition, MVD, defines a subset of the IFC schema, that is needed to satisfy one or many Exchange Requirements of the AEC industry. The basic FM hand overview definition developed by BuildingSMART exchanges facility management information among building models.
The COBie spreadsheet is a mapping of the FM Handover Model View Definition (MVD) of the current IFC 2x3 scheme as documented in the COBie responsibility matrix.
BS 8541-1: Type object intended for use in stages of design when the object is not resolved in a product.
Object type intended for use in stages of design when the finalised solution has not yet been completely resolved. Example: Generic – Hand-Drier 285x200x250 (electric device).
|Geometric representation||Geometric representation of the space defined by a products external boundaries. Also referred to as product shape or shape representation in other documentation.|
Includes elevation, plan, section, front, side, isometric and animation views.
See also View type.
|Hard coded||Fixed data or property in a BIM platform that cannot be altered.|
|Identification (ISO 16739)||Capability to find, retrieve, report, change, or delete specific instances without ambiguity.|
|IfcBuildingElementProxyType||This defines a list of commonly shared property set definitions of a building element proxy and an optional set of product representations. It is used to define an element specification (i.e. the specific product information that is common to all occurrences of that product type).|
|IfcPredefinedType||Defines the particular type.|
The object type defines the specific information about a type, that is common and shared by multiple object occurrences.
The object type is represented by a set of property set definitions.
Similar to class, template and type.
|Industry Foundation Class (IFC)||
Open vendor-independent neutral file format that defines an extendable set of consistent data representing building information for exchange and interoperability between AEC software applications. The IFC specification is developed and maintained by BuildingSMART International as its “Data standard”.
It is registered with ISO as ISO16739.
|Convention indicating an abstract item.|
BS 1192: An occurrence of an entity at a particular location and orientation within a model.
Synonym for occurrence.
Similar to the term instance of a class in object oriented programming.
See also component.
A composite layered object with simple to medium geometry and a range of parameters.
A layered object may consist of one layer e.g. waterproof membrane, insulation, metal decking or consist of a number of layers combined to for a multi layered object.
A multi layered object is often used where it is more practical to model multiple layers together rather than model each separate layer individually.
|Level of detail (BS 8541-3)||Completeness and accuracy of a virtual shape representation compared to the physical and functional characteristics of the actual object.|
|Level of measurement (BS 8541-3)||Completeness and accuracy of a virtual measurement compared to the physical and function characteristics of the actual object.|
|Line (ISO 128)||
Geometrical object, the length of which is more than half of the line width and which connects an origin with an end in any way, e.g. straight or curved, and without interruptions.
The term line width is also synonymous with line weight or pen weight.
|Line types||A collection of lines.
Synonym for line pattern.
Type object intended to represent an obtainable product, either as a requirement or exemplar or as-built, as defined by BS 8541-1.
Note: The term manufacturer object is also synonymous with proprietary object or product object.
May carry information regarding identity, performance and appearance. Material may be assigned a specific colour, surface pattern or designated render appearance and specific line work for 2D representation to control the outward appearance of the construction product or geometrical representation in graphical views.
Materials can be used on their own as finishes and coatings, as building products within an object, or to represent an option within an object.
The term material is often synonymous with building material, construction material and surface.
|Metadata (BS-1192)||Data used for the description and management of documents and other containers.
Note: Each item of meta-data resides in a field. Codes are the values allowed for fields.
ISO 12006-2: Any perceivable or conceivable word.
PAS 1192: Item having state, behaviour and unique identity – for example, a wall object.
The term object is also synonymous with entity, construction entity and construction element as defined by ISO 12006-2.
|Occurrence object (BS 8541)||Representation of an actual occurrence (instance) of an object in a building.
See also component.
|Parametric geometry||Geometry is that is defined and controlled by its parameters.|
|Placeholder||A simplified or generic representation of a 3D object (as defined by PAS 1192-2).|
(BS EN ISO 13567-2)
Information which may relate to particular elements or to the model or drawing, and which may need to be switched on or off.
Note: Presentation in formation is related primarily to the graphical appearance on screen and paper, as opposed to element information which is related to the physical structure.
|Product object (BS 8541)||See Manufacturer object.|
The generalisation of all characteristics (either types or partial type, i.e. property sets that may be assigned to objects. Shared among object instances, it reflects the specific information of an object type, but it may also represent the occurrence information of the actual object in the project context, if it is assigned only to a single object instance.
Properties are used to represent technical data and functions for designing, calculating and simulating the product. They can be:
ISO 16739: Unit of information that is dynamically defined as a particular entity instance.
ISO 12006-2: Construction objects have construction properties. Properties are represented as attributes in construction information.
Note: The term parameter is often used by BIM platforms to describe the property information type that has been used to define a BIM object.
|Property set||Collection of characteristics associated with an object and grouped together that can comprise of parameters and attributes.|
Scale view of an object.
a) Representation is often also referred to as visibility or display.
b) The terms ‘Low/ symbolic/ simple/ Course, Medium, High/ detailed/ fine/ realistic’ are often used to as a substitute for 1:20, 1:50 and 1:100.
|RIBA Plan of Work 2013||The RIBA Plan of Work 2013 comprises eight work stages, each with clear boundaries and details the tasks and outputs required at each stage. Further information can be viewed at http://www.ribaplanofwork.com|
Data model in a formal machine-readable notation. The IFC specification consists of such a schema and associated informal human-readable semantic definitions.
The schema describes a set of data types and their possible relationships.
|Section (ISO 10209-1:1992)||
A representation showing only the outlines of an object lying in one or more cutting planes.
Synonym for cut.
(BS ISO 16757:1)
|Used to select a single product from a catalogue which often contains more than a million products of a similar kind.|
|Scale view incorporating only the essential shape, size or features of an object.|
|Specification||Description of the quality of, and requirements of, the construction product.|
(BS ISO 16792)
|Geometric elements included in product definition data to commutate design requirements but not intended to represent a portion of the manufactured product.|
|Symbol (BS 8541-2)||
Graphical device without scale used:
a) on a drawing to indicate the occurrence and/or location of an item
b) in an annotation to indicate one or more of the attributes of that item.
Systems consist of products defined by technical function, form and/or material such as masonry, insolation and blockwork.
IFC: organised combinations of related parts, composed for a common purpose or function or to provide a service. System is essentially a functionally related aggregation of products.
|Système international d’unités (SI)
(International System of Units)
(BS EN ISO 800000-1)
|System of units, based on the International System of Quantities and adopted by the General Conference on Weights and Measures (CGPM). Comprises names and symbols, including a series of prefixes, with rules for their use.|
Common characteristics shared by multiple object occurrences.
The named specification for equipment, products and materials.
Similar to object class, template, style, category, subcategory, functional type, library part, or subtype in other publications.
Information given against a property.
Example: Text, Boolean, Length, Look up table, Real, Units, Volume.
|Variations/ Variants||A form or version that differs in some respect from other forms of the same things or from a standard.|
|View types||Collective term used for and including graphical view and document view.|
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