IFC4.1
官方地址:https://standards.buildingsmart.org/IFC/RELEASE/IFC4_1/FINAL/HTML/
国内地址1:http://www.vfkjsd.cn/ifc/ifc4_1/buildingsmart/index.htm
国内地址2:http://www.bim-times.com/ifc/ifc4_1/buildingsmart/index.htm
IFC4
国内地址1:http://www.vfkjsd.cn/ifc/ifc4/index.htm
国内地址2:http://www.bim-times.com/ifc/ifc4/index.htm
官方地址:http://www.buildingsmart-tech.org/ifc/IFC4/Add2/html/
IFC2x3参考手册
国内地址:http://www.bim-times.com/ifc/ifc2x3/index.htm
官方地址:http://www.buildingsmart-tech.org/ifc/IFC2x3/TC1/html/index.htm
https://standards.buildingsmart.org/IFC/RELEASE/
https://www.solvusoft.com/zh-cn/file-extensions/software/graphisoft/archicad/
https://github.com/buildingSMART