{
  "schemaVersion": 1,
  "policy": "controlled-local-only; fail-closed on ambiguous identity; no production DWG/project writes",
  "fixtures": [
    {
      "id": "LINE_NUMBER_ORTHO_OWNED",
      "requiredDocument": "controlled Plant Ortho DWG copy",
      "requiredObjects": ["Pipe with DataLinks line number", "owned line-number block", "legacy layers/text styles"],
      "selection": "exact owned block handle discovered from drawing",
      "preState": "owned annotation baseline and unchanged Plant source",
      "mutation": "create/update/delete line annotation",
      "repeat": "update or AlreadyExists according to command",
      "undo": "native AutoCAD UNDO restores entity and ownership baseline",
      "workflows": ["PXP-LN", "PXP-ULN", "PXP-ESN", "PXP-ELN", "PXP-RMP"]
    },
    {
      "id": "CONNECTOR_TOPOLOGY",
      "requiredDocument": "controlled Plant project and Ortho copy",
      "requiredObjects": ["two connected Plant parts", "connector/port snapshot", "P3dPartConnection", "line-group relationships"],
      "selection": "exact connector source identity; no arbitrary entity fallback",
      "preState": "no owned connection annotation",
      "mutation": "orthogonal connection leader and ownership XData",
      "repeat": "recreate/update without duplicate ownership",
      "undo": "native AutoCAD UNDO restores pre-annotation state",
      "workflows": ["PXP-ALC"]
    },
    {
      "id": "ELEVATION_GOLDEN",
      "requiredDocument": "controlled Plant model plus paper/model context",
      "requiredObjects": ["positive, negative and zero elevations", "BLOCK_ELEVATION definition", "attribute definitions"],
      "selection": "exact Plant source object handle",
      "preState": "source object and annotation baseline",
      "mutation": "legacy /5, AwayFromZero, *5 elevation annotation",
      "repeat": "update existing owned annotation",
      "undo": "native AutoCAD UNDO restores baseline",
      "workflows": ["PXP-AE", "PXP-IE"]
    },
    {
      "id": "ORTHO_VIEWPORT_EXACT",
      "requiredDocument": "controlled Plant Ortho DWG with one-to-one source view mapping",
      "requiredObjects": ["exact viewport handle/ObjectId", "layout membership", "Ortho view identity", "visible Plant candidates"],
      "selection": "validated AcDbViewport handle and expected Ortho mapping",
      "preState": "viewport and annotation baseline",
      "mutation": "view annotation/viewport maintenance operation",
      "repeat": "deterministic update/no duplicate",
      "undo": "native AutoCAD UNDO restores viewport/entity baseline",
      "workflows": ["PXP-AAV", "PXP-COV", "PXP-UOB", "PXP-DJ"],
      "status": "EXACT_VIEWPORT_FIXTURE_BLOCKED"
    },
    {
      "id": "MANUAL_TEMPLATE_EDIT",
      "requiredDocument": "controlled local Template-derived drawing",
      "requiredObjects": ["manual annotation blocks", "attributes", "dynamic properties", "required layers/styles", "owned P_REC_ANNOT_MANUAL XData"],
      "selection": "exact owned annotation handle for edit/reopen",
      "preState": "palette state and owned annotation baseline",
      "mutation": "manual insert/update/attribute persistence",
      "repeat": "restore and update existing owned annotation",
      "undo": "native AutoCAD UNDO restores entity and manual-state baseline",
      "workflows": ["mto-ma", "PXP-MA", "CAC", "CAC1", "BJ", "PXP-MAB", "PXP-AC"]
    },
    {
      "id": "ORTHO_BATCH_SAME_NAME",
      "requiredDocument": "controlled project copy with two relative drawing paths",
      "requiredObjects": ["same filename in different project-relative directories", "one failing controlled drawing"],
      "selection": "project-relative identity, never filename-only",
      "preState": "unchanged controlled copies",
      "mutation": "per-drawing update with continue-on-error",
      "repeat": "deterministic ordering and idempotent result",
      "undo": "per-drawing recovery/cleanup",
      "workflows": ["PXP-IOD"]
    }
  ]
}