IFCPRESENTATIONRESOURCE
The data model consists of the following:
The schema IfcPresentationResource defines the resources used for
geometric representations and presentations of styled items. The primary
application of this resource is for defining the annotation occurrences of
curve, text, filled area, symbol, and surfaces and particularly the definitions
of fonts, colours and planar extents.
NOTE: The definitions of this
resource of the IFC model have been taken from the International Standard
10303: "Industrial automation systems and integration - Product data
representation and exchange", Part 46 "Integrated generic resources: Visual
presentation". The reference of the final international standard is ISO/IS
10303-46:1994. The IfcPresentationResource refers to the clause 7,
"Presentation resource schema" of the standard.
The definitions taken from ISO/IS 10303-46:1994 have undergone a
adaptation process, characterized by:
- adaptation of the IFC naming convention (inner majuscules and Ifc
prefix)
- adaptation of the STEP entities, where multiple inheritance or
non-exclusive inheritance (i.e. AND or ANDOR subtype constraints) are used
- selection of a subset of the IR, using subtype and select
pruning
- dimensionality of geometric representation items defined at each item
(not through the representation context)
- omission of the name attribute at the representation item
The semantic definitions of IfcPresentationResource are defined
following the adaptation of the ISO/CD 10303-46:1992, Industrial
Automation Systems and Integration: Product Data Representation and Exchange -
Part 46: Integrated Generic Resources. Visual presentation. The type,
class, and function semantic definition sections follow the adapted wording of
the working draft, which is clearly indicated and quoted at each reference.
The definitions of all parts of the IfcPresentationResource, that
are taken from ISO10303-46 are explicitly excluded from the copyright of the
International Alliance of Interoperability.
NOTE: For more information on
the definitions as defined in the formal ISO standard please refer to: ISO/IS
10303-46:1994, Industrial Automation Systems and Integration: Product Data
Representation and Exchange - Part 46: Integrated generic resources: Visual
presentation. The formal standard can be obtained through the local publishers
of standards in each individual country.
The following is within the scope of the current versions of the
presentation resources:
- definition of presentation style attributes for realistic and
symbolic visualizations of geometric and non-geometric displayble elements in
the product information, including presentation styles for
- curve
- text
- filled area
- symbol
- surface
- support of externally defined character fonts and symbols;
- support of pre defined character fonts and symbols;
- image control by a layer mechanism.
Interfaced schemas (4):
Entities (11):
Defined types (5):
Select types (2):
