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  • #CV-2x3-183 — Welcome to buildingSMART-Tech.org
    There should be no ambiguity in assigning properties to objects There is a built in rule in IFC2x3 to disallow having two properties with the same Name attribute value But there is no built in rule to disallow having two property sets assigned to the same object having the same Name attribute values Therefore it is agreed for each subtype of IfcObject there shall not be two or more property sets with the same Name attribute value assigned for each subtype of IfcTypeObject there shall not be two or more property sets with the same Name attribute value assigned NOTE It is allowed to have an IfcObject with a property set name A and a link to an IfcTypeObject with a property set name A as well In this case any property within the object assigned property set name A1 overrides the property name A1 within the type assigned property set IFC4 provides an explanation and example for the override of properties that applies already to IFC2x3 as well http www buildingsmart tech org ifc IFC4 final html link ifcreldefinesbytype htm Previous CV 2x3 182 Implementation get involved first steps and tools IFC2x3 impl guidance IFC Impl Agreements CV 2x3

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc-implementation/ifc-impl-agreements/cv-2x3-183 (2016-02-11)
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  • IFC4 impl guidance summary — Welcome to buildingSMART-Tech.org
    developer page for more information Basic Knowledge If you are new to IFC implementation it is relevant to read some background and generic information about IFC in Basic IFC knowledge This basic knowledge is independent of the particular IFC release If you are mainly interested in the differences between IFC2x3 and IFC look here Helpful tools Everybody that is implementing IFC needs some kind of parser to retrieve and or generate IFC content Developing such parsers keeping performance when files grow in size can take a lot of time but there are good solutions that away this effort in the form of Toolboxes Helpful viewers To view geometry as well as properties and relations within IFC files it is not needed to use a CAD or other commercial software package Several vendors have free IFC viewers available IFC4 compared to IFC2x3 Using IFC2x3 files in an IFC4 implementation environment and vise versa requires particular care This is discussed here Model View Definition Especially when implementing IFC it is important to understand the concept and restrictions of the Model View Definition you want to support Model View Definitions for the upcoming IFC4 release are yet to be formalized Examples As with any implementation task work by example helps understand the work that has to be done and what should be done The Model Support Group offers examples as well as example code that can be used for this purpose All source code is free to be used and changed for commercial and non commercial purposes the used toolbox is only free in non commercial projects but also can be exchanged with other toolboxes Examples IFC4 Hello Wall example IFC4 Hello House example Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Basic IFC knowledge Helpful tools Toolboxes

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc4-implementation/ifc4-impl-guidance-summary (2016-02-11)
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  • Examples — Welcome to buildingSMART-Tech.org
    IFC4 already Reference to IFC 4 examples are now also part of the official IFC specification http www buildingsmart tech org ifc IFC2x4 rc4 html index htm Annex E In addition you find here two examples of IFC4 files Hello Wall Hello House Above examples are written in C C and can be opened with Visual Studio 6 VS2005 and converted to all new Visual Studio environments All source code is free to be used and changed for commercial and non commercial purposes the used toolbox is only free in non commercial projects but also can be exchanged with other toolboxes Currently those example files are only available as ifc files using P21 file structure examples for ifcxml files using XML file structure are upcoming Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Basic IFC knowledge Helpful tools Toolboxes Helpful tools Viewers IFC4 vs IFC2x3 Model View Definition MVD Helpful examples IFC4 Hello Wall example IFC4 Hello House example Implementer s community accompanying documents frequently asked questions 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

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc4-implementation/helpful-examples/examples (2016-02-11)
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  • RC4 summary — Welcome to buildingSMART-Tech.org
    a simple XML Schema from the IFC and from all Model View Definitions created following the mvdXML methodology First tests show a decrease of XML exchange footage to about 20 25 compared with previous XML files written according to the ifcXML for IFC2x3 schema The ifcXML4 schema is published for the first time in the IFC4 development cycle and it is fully integrated into the IFC specification any construct within the IFC specification has both the EXPRESS and the XSD code MVD fundamental concepts and concept use definitions The new mvdXML methodology defines the Model View Definition as applying a set of fundamental concepts required by the particular exchange scenario expressed as an Information Delivery Manual IDM and adding specific rules on how such fundamental concepts are to be used by the selected subset of IFC constructs A valid MVD is therefore a legal subset of the whole IFC schema with additional rules applying Many of such fundamental concepts called concept template in mvdXML are now part of the IFC4 specification as Chapter 4 Many IFC entities have concept use definitions showing how such fundamental concepts are used This provides an ideal kick start for future MVD developments Property Sets link to buildingSMART Data Dictionary All property set definitions and included property definitionsare now included in the buildingSMART data dictionary bsDD formally known as IFD A direct look up link is provided Each individual property definition provided as part of IFC has an own library GUID managed within the bsDD In addition property set and property definitions can now be expressed within the IFC schema itself as property set and property template hence they are also published as an IFC and ifcXML file see Annex A Examples and instantiation diagrams One of the recognized issues with the IFC specification has always been its complex nature and the steep learning curve to get a first understanding And nothing provides a better explanation than small examples Therefore the Annex E has been greatly enhanced to cover now many examples that are bi directionally linked from the example to the specification and vice versa Most of the examples come with an IFC file that can be used for testing General documentation improvements Many explanations for the IFC constructs have been enhanced and the new method of deriving the use definitions from applying general concepts is introduced step by step This also includes instantiation diagrams that are automatically generated from the concepts that are applicable to a certain IFC entity The change logs both for the IFC schema and for the property set definitions are now automatically generated and available in Annex F Purpose The purpose of publishing the IFC2x4 RC3 is to further encourage the international buildingSMART community to provide feedback and issue reports in order to increase quality and implementability of the next IFC release The focus of the feedback should be the improvement of documentation adding new examples and better overall guidance of the readers Any comments about the ease of

    Original URL path: http://www.buildingsmart-tech.org/specifications/ifc-releases/ifc2x4-release/rc4-release/rc4-summary (2016-02-11)
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  • IFC4 RC4 Documentation
    the construction and fm industries Industry Foundation Classes Release IFC4 Release Candidate 4 published by buildingSMART International Ltd copyright by buildingSMART International Ltd 1996 2012 using the IFC4 documentation requires

    Original URL path: http://www.buildingsmart-tech.org/ifc/IFC2x4/rc4/html/index.htm (2016-02-11)
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  • IFC4 Hello Wall example — Welcome to buildingSMART-Tech.org
    but can be exchanged with another toolbox HelloWall IFC4 zip Zip archive 888 kB 909507 bytes Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Basic IFC knowledge Helpful tools Toolboxes Helpful tools Viewers IFC4 vs IFC2x3 Model View Definition MVD Helpful examples IFC4 Hello Wall example IFC4 Hello House example Implementer s community accompanying documents frequently asked questions Implementations Search Advanced Search IFC Dev Blog

    Original URL path: http://www.buildingsmart-tech.org/implementation/ifc4-implementation/helpful-examples/HelloWall_IFC4.zip/view (2016-02-11)
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  • Implementers community summary — Welcome to buildingSMART-Tech.org
    occuring In detail the purpose of the Implementation Support Group is to support and coordinate Industry Foundation Classes IFC software implementers by providing an appropriate forum and distribute information to serve as a forum to exchange experiences in IFC software implementation and to discusss technical issues and resolve issues with non compliance to promote software implementation by organizing demonstrations participating in tradeshows and communicating the benefits of IFCs for end users to facilitate together with the Modeling Support Group MSG the certification process for IFC software interface implementations to monitor software implementation activities around IFC and to report on its status to other groups of buildingSMART to represent software implementers and their interests within the buildingSMART organization Subgroups In acknowledgment of the different data exchange and sharing requirements that occur in the construction and facility management domain there are focus groups of ISG that target a particular area of the interoperability challenge This is also reflected by the different Model View Definitions MVD that govern the subset of IFC required to support those exchange requirements Currently the active groups are subgroup for the structural modeling analysis and detailing domain subgroup for energy calculation and thermal simulation exchange The main ISG

    Original URL path: http://www.buildingsmart-tech.org/implementation/community/community%20summary (2016-02-11)
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  • structural summary — Welcome to buildingSMART-Tech.org
    workflow IFC model content to fulfill the level of details for structural detailing and the handover to manufacturing Structural analysis view fulfills the need for structural analysis side track workflow and connection check and design workflow The big picture of the structural related work flows Purpose The Structural sub group is part of the Implementer Support Group ISG of the international buildingSMART organization While the IFCs get more wider usage it is necessary that also the workflow issues in a multi domain projects are taken into account from all the domain s point of view Many structural software vendors have already a certified or distributed software version of the IFC support or have started or will soon start to develop the support Therefore it is a good moment to start to think how we the representatives of different structural software vendors could work together to minimize the effort and maximize the benefits for our end users The Building Information Modeling BIM has an effect to the whole industry Interoperability is the key but also the collaborative process on top of the interoperability layer is necessary Many things related to IFCs are simultaneously happening in different parts of the globe To keep us informed about all of them it is important to have a forum where this information can be shared The Structural sub group could form such a forum for all with particular interest in structural engineering related workflows Contact Feel free to send your ideas and feedback to Chair of the Structural sub group lassi liflander at tekla com Please see the events calendar for future teleconferences and meetings Next Structural analysis sub group Implementation get involved first steps and tools IFC2x3 impl guidance IFC4 impl guidance Implementer s community energy structural Structural analysis sub group The Big Picture

    Original URL path: http://www.buildingsmart-tech.org/implementation/community/structural/structural-summary (2016-02-11)
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