SharePoint 2013 workflow object model
Get a brief introduction to the workflow object model in SharePoint 2013.
Last modified: September 17, 2015
Applies to: SharePoint Server 2013
The SharePoint 2013 object model is built on top of the .NET Framework 4 object model for Windows Workflow Foundation 4, but with innovations that enable workflow functionality in SharePoint generally, and in SharePoint Add-ins in particular. The native .NET Framework 4 object model for Windows Workflow Foundation 4 is located in the .NET Framework System.Workflow namespaces.
One way to think of the SharePoint workflow object model is as a set of workflow services. There are four services:
Instance management service: Manages workflow instances and their execution.
Deployment service: Manages the deployment of workflow definitions.
Interop service: Manages the interop bridge for supporting legacy workflows.
Messaging service: Manages message queuing and transport.
SharePoint workflow namespaces
The SharePoint workflow object model, on the other hand, is contained in ten namespaces: five of them are SharePoint namespaces, and five others are Microsoft Office namespaces.