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ExternalService.IsSerializable

Property
Description:
Indicates whether executions of the service requires serialization in documents or not.
Remarks:
When a serializable service is executed in a document, a record about the executed server (or servers) is stored in the document's history. This allows active servers to be synchronized next time a saved document is opened in Revit.

Executions of a serializable service in a document must happen inside a transaction.

Syntax
public bool IsSerializable { get; }