This workflow
o Will demonstrate moving user visible data from one place to another
o Will demonstrate extracting data that is not available except via API
o Is not about Fancy Geometry, but does deal with geometry.
o Demonstrates a round trip workflow of pulling information out of something External to Dynamo (Revit) and Writing back to it. The same principles of input and output can be applied to Excel, SAT files on disk, image files, etc.
Source