The content in https://www.eclipse.org/che/docs/che-7/converting-a-che-6-workspace-to-a-che-7-devfile/ uses prod-ver and prod-prev-ver attributes, which works well for Che 6 vs Che 7.

However, when downstreamed, this becomes problematic now that version 2.1 is out – prod-prev-ver is no longer 1.2 but 2.0, which causes the CRW doc to render incorrectly: https://access.redhat.com/documentation/en-us/red_hat_codeready_workspaces/2.1/html-single/end-user_guide/index#converting-a-codeready-workspaces-2.0-workspace-to-a-codeready-workspaces-2.1-devfile

We already an attribute for the current product version: prod-ver. Let's keep it.

prod-prev-ver attribute is the previous minor version.

We need a new attribute for previous major version. Let's define it as prod-prev-ver-major:

• Downstream:

  :prod-prev-ver-major: 1.2 

• Upstream:

  :prod-prev-ver-major: 6.x 

NB: please also use this new attribute in the downstream-only upgrade from the previous major version doc.

docs/topics/crw/proc_upgrading-codeready-workspaces-from-previous-major-version.adoc

• docs/topics/crw/proc_upgrading-codeready-workspaces-from-previous-major-version.adoc

This section describes how to perform an upgrade from the previous major version of

{prod} (1.2).
->
This sections describes how to perform an upgrade from the previous major version of {prod}

(####herethenewattribute####).