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  • Summary for faq — Welcome to buildingSMART-Tech.org
    General questions about buildingSMART IAI and IFC General understanding of the IFC Specification Specific question about the IFC Specification Initial questions for implementing the IFC Specification in Software Basics for introducing and using IFC compatible software Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Implementer s community accompanying documents frequently asked questions faq general questions fag general ifc spec faq specific ifc spec faq ifc

    Original URL path: http://www.buildingsmart-tech.org/implementation/faq (2016-02-11)
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  • faq general questions — Welcome to buildingSMART-Tech.org
    Building Information Model i e a digital representation of the building in software based on object information combining graphical and non graphical properties BIM Software often relates to 3D and object based CAD IFC is an open standard to represent the information in a building information model that can be used to openly exchange and share this information among many different software systems It supports BIM as a computable representation of the physical and functional characteristics of a facility and its related project life cycle information using open industry standards to inform business decision making for realizing better value NIBS Facility Information Council Q How does it relate to other file formats A It differentiates itself from other formats by its object focus and its openness Object focus IFC is a standard for building information models not for drawings It enables to exchange information about building structures elements spaces and other objects in a BIM 3D and 2D shape properties and attributes parameters and relationships e g connectivity among elements are examples for the content of IFC Actual IFC files are based on a view definition that determines the scope of the IFC exchange Openness IFC is an open specification supported by an international non for profit organization and it is registered with ISO as ISO16739 It is not owned by a single vendor or group of vendors Q Who develops IFC What is the procedure for IFC development A IFC is developed as an open standard by buildingSMART International that has implemented a standing group the Modelling Support Group MSG to develop and maintain the IFC standard This website is the website of buildingSMART MSG and contains all official information around IFC Q Who decides about what becomes part of the IFC standard A The basic development direction of IFC is a decision made by buildingSMART International New general additions to IFC increasing general scope have to be proposed to buildingSMART International as an IFC extension project proposal The technical decision making group ITM votes on accepting such a new IFC extension projects Minor additions can be handled by the general maintenance process between IFC releases and may lead to an intermediate minor update i e a technical corrigendum Issues are resolved by the Modeling Support Group MSG based on a consensus driven process Voting would provide an ultimate decision Maintaining the integrity of the overall IFC architecture is the responsibility of the MSG lead Q What is the quality assurance system applied to the development and maintenance of IFC A Any new release minor or major includes an open review process The pre releases alpha beta and release candidate are published on this website and an announcement for review is made The internal review is performed by MSG itself Each part of the IFC specification short form schema has an owner being responsible for proposing and doing the changes and additions and 1 2 internal reviewers counter checking the changes and additions The external review is open for

    Original URL path: http://www.buildingsmart-tech.org/implementation/faq/faq-general-questions (2016-02-11)
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  • fag general ifc spec — Welcome to buildingSMART-Tech.org
    at http en wikipedia org wiki ISO 10303 11 Q How does the different versions of the IFC model relate to each other A There have been five principal releases of the IFC over since 1996 these had been IFC1 5 1 IFC2 0 IFC2x IFC2x2 and IFC2x3 Since the release of IFC2x published in 2000 each release has left the core or platform of the IFC specification unchanged and has added to it This platform guarantee has meant that most vendors have had no difficulty in upgrading their application to IFC2x2 IFC2x3 and hopefully in future to IFC2x4 Since the publication of IFC2x new releases where mainly driven by adding new concepts to the IFC specification in order to capture more exchange use cases and to improve existing definitions reflecting the lessons learnt from implementation and usage Since IFC2x a new major release has been published every 3 years See also the following overview Q I heard about ifcXML what is the difference between IFC and ifcXML A Content wise there is no difference ifcXML represents the same content of the IFC specification as IFC EXPRESS does The ifcXML XSD schema is generated from the master EXPRESS representation by a language binding described by ISO10303 28ed2 ifcXML files are XML document files that validate against the ifcXML XSD An IFC model can be written and read from a data file in these ways Usually a ifc file contains the model represented in STEP physical file format STF Alternatively exactly the same information can be represented as XML using the ifcXML schema definition The file extension is ifcxml A current proposal within the Implementation Support Group would allow to read write a zipped ifc or ifcxml file directly from a file with the extension ifczip Q What are the advantages

    Original URL path: http://www.buildingsmart-tech.org/implementation/faq/fag-general-ifc-spec (2016-02-11)
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  • faq specific ifc spec — Welcome to buildingSMART-Tech.org
    form schema is used for documentation purposes and in schema development It consists of a number of sub schemas for different topics e g shared building elements schema architecture domain schema and so on The term IFC schema if not specified otherwise always relate to long form schema Q What is a property set A Most objects can have properties attached to them that have little or no relationship to other objects The IFC model differentiates between attributes that are directly attached to the object as attribute of the entity and properties group in a property set and assigned to the object by an relationship The latter is the more flexible way to extent applicable properties Furthermore these properties are evolving over time and may be specific to particular regions countries or projects The IFC schema supports storing and transmitting these properties in named sets The IFC schema recommends property sets as part of the IFC Specification already but regional adoptions and applications may define more MSG has published an XML schema called Property Set Definition schema PSD to defined the properties and property sets Q How can I see all entities sub types types etc in the IFC specification A Use the IFC Specification published as a HTML document set here Flat lists of all defined types enumerations select types and entity types are available in the HTML documentation via alphabetical listing in the Browsing documentation frame A tree view of all subtypes of entity types is available under hierarchy listing in the Browsing documentation frame This requires JavaScript to be enabled in the browser Q In IFC there are many optional attributes why What does it mean if I receive empty optional attributes A An empty attribute i e an attribute having indefinite value generally means that no value is known or that no particular value is applicable in the respective information exchange Since the IFC specification is developed to cover many exchange use cases at different stages of the building life cycle there is hardly any attribute for which providing a value is mandatory at each life cycle stage and exchange purpose Therefore almost all attributes are optional in the IFC specification A view definition that narrows the scope of IFC implementation for a given exchange use case may determine that attributes that are optional in the IFC specification have to have values asserted A few attribute definitions in the IFC specifications specify default values which shall be assumed if an exchange file contains the indefinite value Q Which attributes are written to an IFC file and how to obtain the other attributes inverse and derived attributes A So called explicit attributes the usual plain attributes occur directly in IFC exchange files If an explicit attribute is defined as OPTIONAL in express and an object an entity instance does not provide a value for such an attribute then the attribute still occurs in the file as a dollar sign So called INVERSE attributes reverse cross references between

    Original URL path: http://www.buildingsmart-tech.org/implementation/faq/faq-specific-ifc-spec (2016-02-11)
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  • faq ifc implementation — Welcome to buildingSMART-Tech.org
    IFC version 2x3 is the best choice to implement it has the broadest coverage of support of all published IFC releases In case you expect a really very long period before going to market contact a specialist to decide if it is beneficial to start directly with version 2x4 Q IFC does not quite support a specific need that I have What can I do about it A Consider if the specific need is for an object with representations and relationships to other objects in the model or is the need for some further properties For example an airflow application models spaces and cracks Spaces are already part of the IFC schema but there is no representation of a crack However any crack is in reality associated to a physical object a wall door or window Hence a property set can be defined to hold the properties of the crack such the length average width and perhaps also the airflow rate expected for a given pressure As another example perhaps your building proposal includes an artistic sculpture in the courtyard This is clearly not a simple property of the courtyard and the IFC model supports proxy objects These function as objects but make no assertion as to their function or role The application should offer the user the facility to classify or describe the object in detail See IfcBuildingElementProxy as the extensible proxy definition of the IFC specification Q Where can I find some sample code implementing IFC A There is an example how to write an IFC file from scratch available via http www iai tech org services get started hello world Most developers of toolboxes offer a test version including some examples on request The following links give a set of examples http www ifcbrowser com ifcenginedll html

    Original URL path: http://www.buildingsmart-tech.org/implementation/faq/faq-ifc-implementation (2016-02-11)
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  • faq ifc software usage — Welcome to buildingSMART-Tech.org
    W W Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Implementer s community accompanying documents frequently asked questions faq general questions fag general ifc spec faq specific ifc spec faq ifc implementation faq ifc software usage Implementations Search Advanced Search IFC Dev Blog IFC Dev Blog More Registration This site contains content which is only available to registered users To get access to the content

    Original URL path: http://www.buildingsmart-tech.org/implementation/faq/faq-ifc-software-usage (2016-02-11)
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  • All Applications by Category — Welcome to buildingSMART-Tech.org
    by primary functional category of all software applications utilities in the IFC Compatible Implementations Database These applications utilities are purported by their developers to provide IFC import and or export functionality The intent of the database is to track all such applications utilities providing an official centralized resource for the public and development community interested in IFC The buildingSMART ISG is responsible for the creation and maintenance of this database but due to the fluid nature of software development and the volatility of the AEC industry it is possible that information will be outdated at times Vendor and public feedback about the contents of the database is greatly appreciated and can be directed via the contact link at the upper right hand corner of this page Type Name Import Export Url View as static table Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Implementer s community accompanying documents frequently asked questions Implementations All Applications by Category All Vendors All Applications Search Advanced Search IFC Dev Blog IFC Dev Blog More Registration This site contains content which is only available to registered users To get access to the content you must be a registered user Please

    Original URL path: http://www.buildingsmart-tech.org/implementation/implementations (2016-02-11)
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  • All Applications by Category — Welcome to buildingSMART-Tech.org
    functional category of all software applications utilities in the IFC Compatible Implementations Database These applications utilities are purported by their developers to provide IFC import and or export functionality The intent of the database is to track all such applications utilities providing an official centralized resource for the public and development community interested in IFC The buildingSMART ISG is responsible for the creation and maintenance of this database but due to the fluid nature of software development and the volatility of the AEC industry it is possible that information will be outdated at times Vendor and public feedback about the contents of the database is greatly appreciated and can be directed via the contact link at the upper right hand corner of this page Type Name Import Export Url View as static table Previous Application Next All Vendors Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Implementer s community accompanying documents frequently asked questions Implementations All Applications by Category All Vendors All Applications Search Advanced Search IFC Dev Blog IFC Dev Blog More Registration This site contains content which is only available to registered users To get access to the content you must be a

    Original URL path: http://www.buildingsmart-tech.org/implementation/implementations/allplominoform.application (2016-02-11)
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