To try and resolve #1233

[sei-vsarvepalli]

This pull request updates the namespace extension pattern logic and its documentation to clarify the handling of language extensions, especially around empty language extensions and their valid forms. It also adjusts tests and workflow configuration for better correctness and coverage. The most important changes are outlined below:

Namespace extension pattern logic and documentation:

• Updated the ABNF (ssvc_namespace_pattern.abnf) and Python regex (namespace_patterns.py) to clarify and correct the rules for namespace extensions, distinguishing between empty language extensions and BCP-47 language codes, and specifying the valid forms for extension segments. [1] [2]

Test coverage improvements:

• Modified test cases in test_namespaces_pattern.py to remove an invalid case (x_example.test#test/) and add an invalid case (ssvc/) for empty language extensions, ensuring the tests align with the updated pattern rules. [1] [2]

Workflow configuration:

• Updated the GitHub Actions workflow (run_doctools.yml) to check out the correct repository and commit SHA for pull requests, improving CI reliability and correctness.

[Copilot]

🟡 Changes recommended

The workflow checkout configuration can prevent doctools updates from being pushed, and the documented ssvc/ behavior is inconsistent with its test.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

This PR tightens namespace extension validation, regenerates related schemas and regexes, updates tests, and adjusts the doctools workflow.

Changes:

• Clarifies namespace extension grammar and validation.
• Updates generated schemas, registry data, and tests.
• Revises workflow checkout and action configuration.

File summaries

File	Summary
src/test/test_namespaces_pattern.py	Tests bare ssvc/ as invalid; description requires clarification.
src/ssvc/utils/ssvc_namespace_pattern.abnf	Updates namespace extension grammar.
src/ssvc/utils/namespace_patterns.py	Updates generated namespace regex logic.
data/schema/v2/SsvcObjectRegistry_2_0_0.schema.json	Updates generated namespace validation patterns.
data/schema/v2/SelectionList_2_0_0.schema.json	Updates generated namespace validation patterns.
data/schema/v2/DecisionTable_2_0_0.schema.json	Updates generated namespace validation patterns.
data/schema/v2/DecisionPointGroup_2_0_0.schema.json	Updates generated namespace validation patterns.
data/schema/v2/DecisionPoint_2_0_0.schema.json	Updates generated namespace validation patterns.
data/json/ssvc_object_registry.json	Refreshes registry metadata.
.github/workflows/run_doctools.yml	Checkout ref must preserve the PR head branch for subsequent pushes.

Review details

• Files reviewed: 10/10 changed files
• Comments generated: 2
• Review effort level: Lite

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[ahouseholder]

Assuming and/or based on the "expect fail ssvc/ test passing, I'm okay with this change. The trailing slash was unintended.