IfcProduct
Definition from IAI: Any object, or any aid
to define, organize and annotate an object, that relates to a geometric
or spatial context. Subtypes of IfcProduct usually
hold a shape representation and a local placement within the project
structure.
This includes manufactured, supplied or created objects
(referred to as elements) for incorporation into an AEC/FM project.
This also includes objects that are created indirectly by other
products, as spaces are defined by bounding elements. Products can be
designated for permanent use or temporary use, an example for the
latter is formwork. Products are defined by their properties and
representations.
In addition to physical products (covered by the subtype IfcElement)
and spatial items (covered by the subtype IfcSpatialStructureElement)
the IfcProduct also includes non-physical items,
that relate to a geometric or spatial contexts, such as grid, port,
annotation, structural actions, etc.
HISTORY
New Entity in IFC Release 1.0
Use Definition
Any instance of IfcProduct defines a
particular occurrence of a product, the common type information, that
relates to many similar (or identical) occurrences of IfcProduct,
is handled by the IfcTypeProduct (and its
subtypes), assigned to one or many occurrences of IfcProduct
by using the objectified relationship IfcRelDefinesByType.
The IfcTypeProduct may provide, in addition to
common properties, also a common geometric representation for all
occurrences.
An IfcProduct occurs at a specific
location in space if it has a geometric representation assigned. It can
be placed relatively to other products, but ultimately relative to the
world coordinate system defined for this project.
The inherited ObjectType attribute can be
used to designate a particular type of the product instance. If
subtypes of IfcProduct have a PredefinedType
defined, the ObjectType is used to provide the user
defined, particular type of the product instance, if the PredefinedType
is set to USERDEFINED.
EXPRESS specification:
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| WR1
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(EXISTS(Representation) AND EXISTS(ObjectPlacement))
OR (EXISTS(Representation) AND
(NOT('IFCREPRESENTATIONRESOURCE.IFCPRODUCTDEFINITIONSHAPE' IN TYPEOF(Representation))))
OR (NOT(EXISTS(Representation)))
;
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Attribute definitions:
| ObjectPlacement
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Placement of the product in space, the placement can either be absolute (relative to the world coordinate
system), relative (relative to the object placement of another product), or constraint (e.g. relative
to grid axes). It is determined by the various subtypes of IfcObjectPlacement, which includes the axis
placement information to determine the transformation for the object coordinate system.
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| Representation
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Reference to the representations of the product, being either a representation (IfcProductRepresentation)
or as a special case a shape representations (IfcProductDefinitionShape). The product definition shape
provides for multiple geometric representations of the shape property of the object within the same object
coordinate system, defined by the object placement.
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| ReferencedBy
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Reference to the IfcRelAssignsToProduct relationship, by which other subtypes of IfcObject can be related
to the product.
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Formal Propositions:
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If an Representation is given, then also a LocalPlacement has to be given.
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Inheritance graph