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#CV-2x3-154

agreement on the compression mechanism for ifcZIP
number
CV-06-154
based on
IFC2x3
effects
extended coordination view
date
24. Jun 2008
initiator
ISG meeting in Amsterdam
summary agreement on the compression mechanism for ifcZIP

 

Description

All ifcZIP files are written using the pkzip compression. There shall be only a single *.ifc file (or only a single ifcXML file) in the main directory of the ifcZIP (i.e. zip) file. Therefore the same compression mechanism shall be used for ifc and ifcXML files.

  • NOTE: Later agreements may propose a sub directory structure for linked documents, texture files, etc.

 

update based on ISG meeting, Munich, 23. Oct 2008

All ifcZIP files are written using the PKZip 2.04g compression, that limits the zip support to exclude encryption, unicode support and usage of deflate64 mechanism. This compression is compatible with the

  • Windows Compressed Folders,
  • winzip,
  • info-zip and
  • zlib.

 

#CV-2x3-154-1 The ifcZIP file extension can be associated with any IFC compatible software that decompresses the ifcZIP file before import. The ifcZIP extension shall be associated with the official buildingSMART logo for ifcZIP files.