{"abstract":"An empty XML element is treated as absent.","category":"Markup","checks":4,"contract":"Return whether root has a direct child named item, even when it has no children.","evaluation_group":"model-be4359b920993a7c","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-xml-empty-presence","id":"FA-3241","implementations":{"attempt":{"sha256":"7b9d7c9f27fa5ffb1420b3aa368ab39f5e6cd353b9bd7eb34951dc69ff3b96c9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return ET.fromstring(x).findtext('item') not in (None,'')\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('<r><item/></r>'), True)\ncheck('boundary 2', solve('<r><item>x</item></r>'), True)\ncheck('boundary 3', solve('<r/>'), False)\ncheck('boundary 4', solve('<r><other/></r>'), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"9ea848e7974e5ef18817677fd95cb43c7442f057ede7d4f449eb195d01c96eff","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        node = ET.fromstring(x).find('item')\n        return node is not None and len(node) > 0\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('<r><item/></r>'), True)\ncheck('boundary 2', solve('<r><item>x</item></r>'), True)\ncheck('boundary 3', solve('<r/>'), False)\ncheck('boundary 4', solve('<r><other/></r>'), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"efac9e92dd1b5aae562ba93c6c64c31028add2ad03d161c4160c1df539e146b4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct\nfrom urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit\nfrom email.header import decode_header, make_header\nfrom email.utils import getaddresses\nfrom xml.etree import ElementTree as ET\nimport shlex, string, textwrap\n\nN = 1\nobservations = []\ndef solve(x):\n    try:\n        return ET.fromstring(x).find('item') is not None\n    except Exception as exc:\n        return {\"error\": type(exc).__name__}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('boundary 1', solve('<r><item/></r>'), True)\ncheck('boundary 2', solve('<r><item>x</item></r>'), True)\ncheck('boundary 3', solve('<r/>'), False)\ncheck('boundary 4', solve('<r><other/></r>'), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xp-xml-empty-presence","generated_at":"2026-09-29T14:37:23.226904+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.","repair":"Implement the complete stated contract, including the boundary fixtures: Return whether root has a direct child named item, even when it has no children.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Return whether root has a direct child named item, even when it has no children.","sha256":"c523f2d02748ce578c61185bca54abc5364a206a8ea5bd2f8f0283df674ef944","title":"An empty XML element is treated as absent · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":55.638,"exit_code":1,"observations":[{"actual":false,"check":"boundary 1","expected":true,"passed":false},{"actual":true,"check":"boundary 2","expected":true,"passed":true},{"actual":false,"check":"boundary 3","expected":false,"passed":true},{"actual":false,"check":"boundary 4","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":57.083,"exit_code":1,"observations":[{"actual":false,"check":"boundary 1","expected":true,"passed":false},{"actual":false,"check":"boundary 2","expected":true,"passed":false},{"actual":false,"check":"boundary 3","expected":false,"passed":true},{"actual":false,"check":"boundary 4","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":52.496,"exit_code":0,"observations":[{"actual":true,"check":"boundary 1","expected":true,"passed":true},{"actual":true,"check":"boundary 2","expected":true,"passed":true},{"actual":false,"check":"boundary 3","expected":false,"passed":true},{"actual":false,"check":"boundary 4","expected":false,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}