Import-AFXml (PowerShell) should have ContinueOnError option
Both AFImport.exe and ImportXml (AFSDK) have options to continue on error (like is something is checked out or if there is a duplicate element name). For some reason the PowerShell version doesn't. This should be added.
Brent Bregenzer commented
You can also load AF SDK directly into PowerShell and use the export method. For examples, see:
James Lewis commented
There is a common powershell parameter called ErrorAction. Unfortunately setting this to SilentlyContinue, Continue or Ignore results in the import stopping and a check-in of some new objects and other objects are left in a checked out state. If ErrorAction is not defined, the import stops and does an undo check-in. Perhaps this common parameter could be implemented properly to solve this request.
As a workaround, I'm using the powershell cmdlet start-process to start the afimport.exe.