Support for editing / dev in oXygen XML Editor

[wendellpiez]

User Story:

Both editors and maintainers of Metaschema might want support in oXygen XML Editor (Developer), an excellent XML IDE.

In the old repo we had a functioning oXygen framework for Metaschema, but were unable to maintain it in view of other priorities. It could be resuscitated.

Alternatively (or as an interim approach) an oXygen project file or two could be provided, with instructions, perhaps separately for writing metaschemas and for diagnosing/maintaining pipelines?

Goals:

Some level of support for Metaschema in oXygen, both for editing metaschemas (creating/testing/generating artifacts) and maintaining (running and debugging pipelines).

Dependencies:

None - and this could be staged.

Since the goal is 'some level', consider this Issue closable for some nominal level of support, with spinoff Issues as appropriate.

Acceptance Criteria

• All website and readme documentation affected by the changes in this issue have been updated. Changes to the website can be made in the docs/content directory of your branch.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.
• The CI-CD build process runs without any reported errors on the PR. This can be confirmed by reviewing that all checks have passed in the PR.

{The items above are general acceptance criteria for all User Stories. Please describe anything else that must be completed for this issue to be considered resolved.}

[wendellpiez]

NB oXygen also supports publishing a framework from a site, which given user demand we could provide in this repository or in a dependent one.

Short of the framework however, brief instructions on using projects and resources such as available CSS, XSLT and XProc files etc. could be useful.