workflow specs at Collaboraid via archive.org: http://web.archive.org/web/20050224212933/http://www.collaboraid.biz/developer/workflow-spec
OpenACS.org is using workflow 2.1.1 https://openacs.org/api-doc/package-view?version_id=358193
bugtracker bugs: https://openacs.org/bugtracker/openacs/?format=table&f%5fcomponent=56206&project%5fid=56106&f%5fstate=7
workflow bugs: https://openacs.org/bugtracker/openacs/?format=table&f%5fcomponent=87253&project%5fid=56106&f%5fstate=7
Note bugtracker bug 2978 and workflow bug 2756
https://openacs.org/bugtracker/openacs/bug?bug_number=2978 https://openacs.org/bugtracker/openacs/bug?bug_number=2756
If you install bugtracker from repository via /acs-admin/install then the dependent workflow package is automatically added to the package installation process.