Automated production of display HTML XSLT from Metaschema

[wendellpiez]

User Story:

An OSCAL developer (working with Metaschema) might like to have a way to produce, from a metaschema, a plain simple XSLT, which would produce a reasonably clean HTML rendering of the (metaschema-valid XML) data for display in a vanilla browser.

Goals:

• Ease the long-term burden of maintaining such tooling for every layer
• Encourage others to do more and better things than the "easy 80%" that might be given nearly for free by a tool
• Educate by means of demonstrating yet another use for an OSCAL Metaschema

Dependencies:

None tmk beyond stability in the metaschema design. A prototype XSLT for this already exists on my system.

TBD: whether to produce an XSLT 1.0 stylesheet, an XSLT 3.0 stylesheet, or both. Details of supported interfaces. Details of the mapping, for example propagating @Class.

Acceptance Criteria

• Is the tool in place?
• Can we run it whenever we need, including in CI/CD?
• Do we like the results?

[wendellpiez]

There is a good start at a stylesheet for this now in my active working branch.

[wendellpiez]

XSLT is here: https://github.com/wendellpiez/metaschema/blob/issue39-pipeline-refactor/toolchains/xslt-proto-v04/util/make-xml-publish-XSLT.xsl

It is WIP, but mostly done. A comment notes items tbd.