{"abstract":"An empty XML attribute collapses into a missing attribute.","category":"Markup","checks":4,"contract":"Return the root id attribute or None if absent; retain empty string.","contract_signature":"x","evaluation_group":"model-f2f6ec099dfb0712","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-xml-attribute-presence","id":"FA-3251","implementations":{"attempt":{"sha256":"3362934a3d7e65f82a4979d064803ad3c181bd9a7fdd38471f45f443585a9658","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).get('id','')\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 id=\"\"/>'), '')\ncheck('boundary 2', solve('<r/>'), None)\ncheck('boundary 3', solve('<r id=\"0\"/>'), '0')\ncheck('boundary 4', solve('<r id=\"a&amp;b\"/>'), 'a&b')\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":"ee0175a5fbe0fb36d5aece2d07d04106e0bed50a4a007031bf02a0d7039f9058","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).get('id') or 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 id=\"\"/>'), '')\ncheck('boundary 2', solve('<r/>'), None)\ncheck('boundary 3', solve('<r id=\"0\"/>'), '0')\ncheck('boundary 4', solve('<r id=\"a&amp;b\"/>'), 'a&b')\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-attribute-presence","generated_at":"2026-09-29T14:37:23.459698+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.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Return the root id attribute or None if absent; retain empty string.","sha256":"99e8e1526d0181b7fa69383cea99c408c8980808ee41b279ea553ad08bb17643","title":"An empty XML attribute collapses into a missing attribute · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":54.294,"exit_code":1,"observations":[{"actual":"","check":"boundary 1","expected":"","passed":true},{"actual":"","check":"boundary 2","expected":null,"passed":false},{"actual":"0","check":"boundary 3","expected":"0","passed":true},{"actual":"a&b","check":"boundary 4","expected":"a&b","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": \"\", \"expected\": \"\", \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": \"\", \"expected\": null, \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": \"0\", \"expected\": \"0\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a&b\", \"expected\": \"a&b\", \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":53.861,"exit_code":1,"observations":[{"actual":null,"check":"boundary 1","expected":"","passed":false},{"actual":null,"check":"boundary 2","expected":null,"passed":true},{"actual":"0","check":"boundary 3","expected":"0","passed":true},{"actual":"a&b","check":"boundary 4","expected":"a&b","passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": null, \"expected\": \"\", \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": null, \"expected\": null, \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": \"0\", \"expected\": \"0\", \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": \"a&b\", \"expected\": \"a&b\", \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}