workspaceIdhas been replaced with
workspace, which contains a browser link to the workspace containing the doc (along with an
organizationId, if the doc is in an Enterprise workspace)
folderIdhas been replaced with
folder, which contains a browser link to the folder containing the doc
These changes have been been made to offer better interoperability with the Enterprise Audit API. The original fields have been deprecated and are due to be removed at least 3 months from now.