Dear Mehmet, the question Mr. Adachi (@Yoshi_bSJ) asked is a little bit unclear.
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Do they want to show IFC (3D geometry and its related data/information) on 2D PDF? Like what some solutions like Dalux or even Autodesk BIM360 do? (which is based on converting 2D PDF/Plans to SVG)
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Or are they thinking about a CDE? based on PDF and IFC? In general, an information system which supports different formats like IFC and PDF, etc. (as an integrated solution)