IFC4.2 (4.2.0.0)
The main purpose of IFC4.2 is to extend the IFC schema to include the description of bridge constructions. Extensions made to the IFC4.1 schema include:
- The spatial structure was extended by IfcFacility and IfcFacilityPart as a basis to describe the spatial breakdown structure of infrastructure facilities.
- IfcBridge and IfcBridge part were added to represent bridges and bridge parts.
- Bridge elements have been integrated into a number of predefined types of building elements.
- IfcBearing, IfcDeepFoundation, IfcVibrationDamper and IfcTendonConduit were added to represent the respective bridge elements.
- IfcRelPositions was added to better support positioning along the alignment.
譯：
以IfcFacility和IfcFacilityPart為基礎，對空間結構進行了擴展，描述了基礎設施的空間分解結構。
增加了IfcBridge和IfcBridge part來表示橋梁和橋梁部分。
橋梁元素已集成到許多預定義類型的建築元素中。
添加了ifc軸承、IfcDeepFoundation、IfcVibrationDamper和IfcTendonConduit來表示相應的橋梁構件。
增加了IfcRelPositions以更好地支持沿路線的定位。
IFC4.1 (4.1.0.0)
The main purpose of IFC4.1 is to provide a basis for the various infrastructure domain extensions currently being developed (e.g. Rail, Road, Tunnel, Ports & Waterways). Extensions made to the IFC4 schema include:
- Description of alignment as a combination of horizontal and vertical alignment
- Linear Placement according to ISO 19148
- IfcSectionedSolidHorizontal as a new geometry representation particular useful for describing infrastructure facilities
IFC4.1的主要目的是為目前正在開發的各種基礎設施領域擴展（例如鐵路、公路、隧道、港口和水道）提供基礎。對IFC4模式的擴展包括：
將線形描述為水平和垂直線形的組合
符合ISO 19148的線性放置
IfcSectionedSolidHorizontal作為一種新的幾何表示形式，特別適用於描述基礎設施
IFC4添加2 TC1（4.0.2.1）
IFC4增編2技術勘誤1的主要目的
IFC4 Add2 TC1 (4.0.2.1)
The main purpose of IFC4 Addendum 2 Technical Corrigendum 1 is to provide corrections and clarifications to the documentation of the schema and its constituent parts.
IFC4增編2技術勘誤1的主要目的是對方案及其組成部分的文件進行更正和說明。
IFC4 Add2 (4.0.2.0)
The main purposes of the IFC4 Addendum 2 are the improvement of the IFC4 Add 1 specification documentation and the necessary enhancements of the schema and property sets that resulted from the ongoing pilot implementations of the first two Model View Definitions, the Reference View and the Design Transfer View. The main change related to improvements to the tessellated geometry for the Reference View, and the advanced boundary representation geometry for the Design Transfer View. All changes made are downward compatible.
Two additional schema enhancements have been added after intensive discussions and considerations:
new subtype of tessellated geometry enabling planar and polygonal boundaries with inner loops
new elementary surfaces and intersection curves for more stable definitions of advanced b-rep's (NURBS)
The documentation format has been further improved for readability. More interlinked definitions, now including property and quantity sets, ifcXML files for all examples, in addition to IFC files, etc.;
The use of concept templates (chapter 4) improved, updated to Version 1.1 of the mvdXML specification and including the snippet of the mvdXML for each template;
The use of concepts at relevant IFC Entities, including the snippets of the mvdXML specification for each concept root, optimized for documentation of the requested functionalities;
NOTE This part is currently still experimental and focuses on documentation of concepts, it requires further improvements before being used for automatic IFC file validation purposes;
A Change Log is provided in the HTML documentation
IFC4附錄2的主要目的是改進IFC4 Add 1規范文檔，並對前兩個模型視圖定義（參考視圖和設計轉換視圖）正在進行的試驗性實現所產生的模式和屬性集進行必要的增強。主要更改與對參考視圖的鑲嵌幾何圖形和設計傳遞視圖的高級邊界表示幾何圖形的改進有關。所做的所有更改都是向下兼容的。
經過深入的討論和考慮之后，又增加了兩個架構增強：
支持具有內部循環的平面和多邊形邊界的細分幾何體的新子類型
新的基本曲面和相交曲線，用於更穩定地定義高級b-rep（NURBS）
文件格式已進一步改進，以提高可讀性。更多相互關聯的定義，現在包括特性和數量集、所有示例的ifcXML文件，以及IFC文件等。；
改進了概念模板的使用（第4章），更新到mvdXML規范的1.1版，並為每個模板包含了mvdXML的片段；
在相關IFC實體中使用概念，包括每個概念根的mvdXML規范片段，針對所請求功能的文檔進行了優化；
注：本部分目前仍處於實驗階段，主要集中在概念的文檔化，在用於自動IFC文件驗證之前需要進一步改進；
HTML文檔中提供了更改日志
IFC4 Add1 (4.0.1.0)
A minor update for IFC4 has been published taking into account the experiences and feedback from the pilot implementations and the first Model View definitions. Since 10.07.2015 the IFC4 Addendum 1 is a buildingSMART Final Standard and superseeds the IFC4 Final release.
The main purposes of the IFC4 Addendum 1 are the improvement of the specification documentation and the necessary enhancements of the schema that resulted from the pilot implementations and the first Model View definitions. All changes made are downward compatible.
The documentation format has been further improved for readability. A language independent section to describe the entities and types with their attributes and relationships is now available and separate to the EXPRESS and XSD code;
The use of concept templates (chapter 4) and concepts is greatly enhanced, based on the mvdXML specification to enable better MVD developments and validation;
Minor schema enhancements reflect the experience from pilot implementations of the IFC4 enhancements;
One additional schema enhancement has been added after intensive discussions and considerations, a simplified and far more compact definition of poly lines with arc segments
See the following »summary« of the rationale behind adding this additional geometry definition
A Change Log is provided in the HTML documentation
IFC4的一個小的更新已經發布，考慮到了試驗性實現和第一個模型視圖定義的經驗和反饋。自2015年7月10日起，IFC4附錄1是buildingSMART最終標准，取代了IFC4最終版本。
IFC4附錄1的主要目的是改進規范文檔，並對試驗性實現和第一個模型視圖定義所產生的模式進行必要的增強。所做的所有更改都是向下兼容的。
文件格式已進一步改進，以提高可讀性。現在有一個獨立於語言的部分來描述實體和類型及其屬性和關系，並且獨立於EXPRESS和XSD代碼；
在mvdXML規范的基礎上，概念模板（第4章）和概念的使用得到了極大的增強，以實現更好的MVD開發和驗證；
較小的模式增強反映了IFC4增強的試點實現的經驗；
經過深入的討論和考慮之后，添加了一個額外的模式增強，即具有圓弧段的多邊形的簡化和更緊湊的定義
請參閱以下“概述”，了解添加此附加幾何定義的基本原理
HTML文檔中提供了更改日志
IFC4 (4.0.0.0)
Improvements made to the IFC schema include:
Full ISO standard (not a PAS)
Enhanced capability of the IFC specification in its main architectural, building service and structural elements with new geometric, parametric and other features
Enabled numerous new BIM workflows – including 4D and 5D model exchanges, manufacturer, product libraries, BIM to GIS interoperability, enhanced thermal simulations and sustainability assessments
Linking all IFC property definitions to the buildingSMART data dictionary
Improving readability and ease of access to the documentation with numerous implementation concepts and fully linked examples
Containment of ifcXML4 schema, fully integrated into the IFC specification in addition to the EXPRESS schema
Full integration with new mvdXML technology and allows easy definition of data validation services for IFC4 data submissions
Correction of technical problems found since the release of the IFC2x3
Enabling the extension of IFC to infrastructure and other parts of the built environment
Multilingual translations of the schema
對IFC模式的改進包括：
完全ISO標准（非PAS）
以及增強了IFC的建築幾何特征和其他結構要素的性能
實現了眾多新的BIM工作流，包括4D和5D模型交換、制造商、產品庫、BIM到GIS的互操作性、增強的熱模擬和可持續性評估
將所有IFC特性定義鏈接到buildingSMART數據字典
通過大量的實現概念和完全鏈接的示例提高文檔的可讀性和易訪問性
包含ifcXML4模式，除了EXPRESS模式之外，還完全集成到IFC規范中
與新的mvdXML技術完全集成，允許為IFC4數據提交輕松定義數據驗證服務
IFC2x3發布以來發現的技術問題的糾正
使IFC能夠擴展到基礎設施和構建環境的其他部分
模式的多語言翻譯
IFC2x3 TC1 (2.3.0.1)
Since July 2007 the IFC2x release (as all previous releases of IFC) was superseded by the IFC2x3 Technical Corrigendum 1 - it is strongly recommended to download and use IFC2x3 Technical Corrigendum 1 from now on.
The purpose of this technical corrigendum was to correct several known minor technical problems found since the release of the IFC2x Edition 3 specification and to improve the documentation generally.
Technical corrections include the deletion, modification, or addition of a number of where rules in the EXPRESS schema. As well, a number of functions in the EXPRESS schema have been modified and a new one added. Several derived attributes have been removed from the EXPRESS schema because of ambiguity that could not be resolved satisfactorily.
The modification of the defined type IfcCompoundPlaneAngleMeasure to allow optionally for the expression of angles to a fraction of a second is the only change of the EXPRESS schema that is reflected in the exchange file. This change therefore affects the specification (and existing software implementations) minimally but is an important first step in bringing the IFC and geospatial information specifications into alignment.
Clarifications were introduced to the accompanying documentation in a number of places. All these changes were made to realize the intent of the specification developers and to remove difficulties that implementers were having with data creation and validation. The IFC2x3 to IFC2x3 TC1 change log should be consulted for more details.
自2007年7月以來，IFC2x版本（與IFC的所有先前版本一樣）被IFC2x3技術勘誤1取代-強烈建議從現在起下載並使用IFC2x3技術勘誤1。
本技術勘誤表的目的是糾正自IFC2x第3版規范發布以來發現的幾個已知的次要技術問題，並全面改進文檔。
技術修正包括刪除、修改或添加EXPRESS模式中的許多where規則。此外，EXPRESS模式中的許多函數已經修改並添加了一個新函數。由於無法令人滿意地解決歧義，一些派生屬性已從EXPRESS模式中刪除。
將定義的類型ifccompondPlaneAngleMeasure修改為允許將角度表達式更改為幾秒鍾，這是交換文件中反映的EXPRESS模式的唯一更改。因此，此更改對規范（和現有軟件實現）的影響最小，但卻是使IFC和地理空間信息規范協調一致的重要的第一步。
在一些地方對隨附文件進行了澄清。所有這些更改都是為了實現規范開發人員的意圖，並消除實現者在數據創建和驗證方面遇到的困難。更多詳情，請查閱IFC2x3至IFC2x3 TC1變更日志。
IFC2x3 (2.3.0.0)
The IFC2x3 release was published in Feb 2006 as a successor of IFC2x2 Edition 2. It soon was established as the common ground of IFC implementations, combining previous IFC2x and IFC2x2 implementation threads. IFC2x3 was mainly a quality improvement release not adding scope but refinements on top of IFC2x2.
IFC2x3發布於2006年2月，是IFC2x2第2版的后續版本。它很快被確立為IFC實現的共同點，結合了以前的IFC2x和IFC2x2實現線程。IFC2x3主要是一個質量改進版本，沒有增加范圍，而是在IFC2x2的基礎上進行了改進。
IFC2x2 (2.2.0.0)
The initial IFC2x2 release was published in Mai 2003 as the first successor of the new IFC platform IFC2x. It introduced many extensions to better support the building service and structural domain, e.g. it contains the first IFC sub model for structural analysis, and many extensions for electrical, plumbing and building control definitions. Also the inclusion of 2D content within the model space of a BIM model (line, text, symbols) and presentation information (color, hatching, surface properties, like shading and rendering) are new in IFC2x2.
IFC2x2的初始版本於2003年5月發布，是新IFC平台IFC2x的第一個后續版本。它引入了許多擴展，以更好地支持建築服務和結構領域，例如，它包含用於結構分析的第一個IFC子模型，以及電氣、管道和建築控制定義的許多擴展。此外，在IFC2x2中，在BIM模型的模型空間中包含2D內容（線條、文本、符號）和表示信息（顏色、圖案填充、表面特性，如着色和渲染）也是新的。
IFC2x2 Add1 (2.2.1.0)
Issues with the initial IFC2x2 release were fixed within the IFC2x2 Addendum 1 release, published in July 2004. The required fixes led to an upward compatible schema change. The IFC2x2 Addendum 1 release was recommended for implementation and certification.
初始IFC2x2版本的問題在2004年7月發布的IFC2x2附錄1中得到了修復。所需的修復導致了向上兼容的架構更改。建議實施和認證IFC2x2附錄1版本。
IFC2x Add1 (2.1.1.0)
Issues with the initial IFC2x release were fixed within the IFC2x Addendum 1 release, published in Nov 2001. The required fixes led to an upward compatible schema change. The IFC2x Addendum 1 release was recommended for implementation and certification.
在2001年11月發布的IFC2x補遺1版本中修復了初始IFC2x版本的問題。所需的修復導致了向上兼容的架構更改。建議實施和認證IFC2x附錄1版本。
IFC2x (2.1.0.0)
The initial IFC2x release was published in Nov 2000 as the first IFC platform release. It introduced the concept of a core model and domain extensions. It had been the first IFC release that got a broader implementation base and implementations had been certified using an earlier certification program.
最初的IFC2x版本於2000年11月作為第一個IFC平台發布。它引入了核心模型和域擴展的概念。它是第一個獲得更廣泛的實現基礎的IFC版本，並且已經使用早期的認證程序對實現進行了認證。