Update description of Fragments to emphasize evolving data needs

At a glance

• Identifier: #1193
• Stage: RFC3: Accepted
• Champion: @janettec
• PR: Update description of Fragments to emphasize evolving data needs

Timeline

• Added to 2026-01-15 WG agenda
• Added to 2025-11-06 WG agenda
• Commit pushed: Respond to feedback from last working group meeting on 2025-10-10 by @janettec
• Added to 2025-10-02 WG agenda
• 2 commits pushed on 2025-09-19:
  • Simplify language and remove reference to 'colocation' by @janettec
  • format by @janettec
• Spec PR created on 2025-09-12 by janettec
• 2 commits pushed on 2025-09-12:
  • Update the description for when to use a fragment by @janettec
  • some small edits for new lines + updating a word by @janettec

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