Add meeting notes and slides for Model Engineering Meeting on 2023012…

…6. (usnistgov#1627)

docs/content/contribute/model-engineering-meeting/meeting-2023-01-26.md

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+---
+title: January 26, 2023
+date: 2023-01-26
+summary: The inaugural session of the OSCAL Model Engineering Meeting for 2023
+sidenav:
+    enabled: false
+---
+
+## Overview
+
+- No comments or feedback.
+
+## Ground Rules
+
+- No comments or feedback.
+
+## Review of Current and Completed Work
+
+- No comments or feedback.
+
+## Help Needed
+
+- No comments or feedback.
+
+## POAM JSON and XML Discrepancy (usnistgov/OSCAL#1618)
+
+- AJ summarized the technical details of the issue with Dave and Wendell
+- Community Attendee #1 concurred with analysis but did not have a strong inclination, but we cause breakage now or later
+- Community Attendee #1 asked questions if there are problems with conversion, Wendell confirmed that the conversion is not impacted, just the ergonomics of the discrepancy between both
+- Community Attendee #1 pointed out he has not attempted round-trip conversion. Wendell and AJ concurred we should test round-tripping just in case.
+- Michaela asked how it works in the CLI tool regarding this issue. Wendell explained how Metaschema cross-references XML and JSON differences through the `group-as` construct. Dave further explained how the XSLT and Java-based CLI both operate on this aliasing syntax.
+- Dave posed a valid question: is there anyone who cannot continue development with the OSCAL POA&M model as-is?
+  - Community Attendee #1 says it does not impacted him directly or immediately.
+  - Community Attendee #2 says they similarly are not impacted, but believes it be better to fix it sooner rather than later.
+  - Dmitry said it will not impact him but largely due to the benefits of using JSON Schema with Typescript and his tooling choices.
+- Dave asked for a show of hands for anyone directly impacted by this change.
+- Michaela and others sought recommendations and methods to find information from other stakeholders who actively use JSON models, specifically the POA&M model and seek their perspective
+- Dave summarized views and said if no concrete feedback is received, we plan the change for v2.0.0 release.
+- AJ proposed he can lead a public notification and RFC process for this change.
+
+## Open Question and Answers
+
+- Community Attendee #1 brought up usnistgov/OSCAL#961 and the implications of usnistgov/OSCAL#1618.
+  - If the shape of a model changes, and we suppose that users have intra-document relationships in cross-referenced document instances, it will be challenging with document instances that might not always have the `oscal-version`s declared.
+  - Community Member #1 asked: would signficant changes warrant a new namespace for a major version change?
+- Wendell, Community Attendee #1, Dave, and AJ discussed the long-term implications of XML namespaces in maintaining document instances
+- Dave recommended the XML namespace management, JSON management strategy, and their relationship to the model management strategy be discussed and handled.
+- Michaela proposed for consideration that we seek an avenue for creating an automated transcript of the meetings. AJ recommended we consider that in a different venue as the meeting was ending.
+
+## Slides
+
+You can download [the meeting's slide deck from here](./slides-2023-01-26.pdf).