Metapath grammar in Metaschema repo?

[wendellpiez]

User Story:

As a Metaschema developer I would like ready access to all normative and informative specs especially formals specs, grammars, etc.

There is a draft ANTLR grammar for Metapath syntax here: https://github.com/usnistgov/metaschema-java/blob/main/metaschema-model-common/src/main/antlr4/metapath10.g4

Can it be migrated and maintained in this repository, and/or the functional equivalent?

Goals:

Maintain normative dependencies from the main repo.

Proximate goals for this user include being able to develop a Metapath parser in metaschema-xslt. I would like an iXML grammar, but I will accept what is available.

Dependencies:

? (Semi-finalization of this grammar? TBD on grammar formats/syntaxes?)

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.