In order to link data together we need unique ID’s. My question was, is the unique ID unique to the project or universally unique. When we start looking at federated models and federated data sets we have better make sure that it is universally unique. A step up in the scale of BIM but something that BIG data is already familiar with. Thankfully I was sent some very useful information from Alan Quinn of Autodesk.
“I understand you have questions about Unique ID’s for elements in combined Revit 2013 models. Every element in every Revit file has a unique id. You will have no issues combining model etc. Here’s a few links that will help:
General Questions (See first question and answer)
UniqueId, DWF and IFC GUID (This is at the API level, but helps explain the code)