{"abstract":"Element matching relies on a source prefix spelling.","category":"Markup","checks":4,"contract":"Count direct children whose expanded name is {urn:a}x independent of prefix.","evaluation_group":"model-bf1f39eda06eda0c","failed_approach":"The attempted repair handles the primary example but still violates a separate boundary of the same contract.","family":"xp-xml-namespace-uri-identity","id":"FA-4006","implementations":{"attempt":{"sha256":"9b4086f3c9b63dee53488a6aa266eb317af1ec5d0bf4c85d19633cfc8704a82e","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 sum(e.tag.rsplit('}',1)[-1]=='x' for e in ET.fromstring(x))\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 xmlns:q=\"urn:a\"><q:x/></r>'), 1)\ncheck('boundary 2', solve('<r xmlns:a=\"urn:b\"><a:x/></r>'), 0)\ncheck('boundary 3', solve('<r><x/></r>'), 0)\ncheck('boundary 4', solve('<r xmlns=\"urn:a\"><x/><x/></r>'), 2)\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":"d502f63081e8a1ff43e0ad17bf3053ef5a98f9bdd8d67307892e43a3398fc50c","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 x.count('<a:x')\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 xmlns:q=\"urn:a\"><q:x/></r>'), 1)\ncheck('boundary 2', solve('<r xmlns:a=\"urn:b\"><a:x/></r>'), 0)\ncheck('boundary 3', solve('<r><x/></r>'), 0)\ncheck('boundary 4', solve('<r xmlns=\"urn:a\"><x/><x/></r>'), 2)\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":"2f3462e11aff1d73833fc04cbeeed8ff696a2b160a91c9c749b88e418c217459","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 len(ET.fromstring(x).findall('{urn:a}x'))\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 xmlns:q=\"urn:a\"><q:x/></r>'), 1)\ncheck('boundary 2', solve('<r xmlns:a=\"urn:b\"><a:x/></r>'), 0)\ncheck('boundary 3', solve('<r><x/></r>'), 0)\ncheck('boundary 4', solve('<r xmlns=\"urn:a\"><x/><x/></r>'), 2)\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-namespace-uri-identity","generated_at":"2026-09-29T14:37:34.395268+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: Count direct children whose expanded name is {urn:a}x independent of prefix.","root_cause":"The implementation applies an operation whose text or grammar semantics violate this contract: Count direct children whose expanded name is {urn:a}x independent of prefix.","sha256":"0a686d656632147a10a94ec6e81546656729554de14d6cec74c1458f02141217","title":"Element matching relies on a source prefix spelling · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":60.129,"exit_code":1,"observations":[{"actual":1,"check":"boundary 1","expected":1,"passed":true},{"actual":1,"check":"boundary 2","expected":0,"passed":false},{"actual":1,"check":"boundary 3","expected":0,"passed":false},{"actual":2,"check":"boundary 4","expected":2,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": 1, \"expected\": 0, \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": 1, \"expected\": 0, \"passed\": false}, {\"check\": \"boundary 4\", \"actual\": 2, \"expected\": 2, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":62.594,"exit_code":1,"observations":[{"actual":0,"check":"boundary 1","expected":1,"passed":false},{"actual":1,"check":"boundary 2","expected":0,"passed":false},{"actual":0,"check":"boundary 3","expected":0,"passed":true},{"actual":0,"check":"boundary 4","expected":2,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": 0, \"expected\": 1, \"passed\": false}, {\"check\": \"boundary 2\", \"actual\": 1, \"expected\": 0, \"passed\": false}, {\"check\": \"boundary 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": 0, \"expected\": 2, \"passed\": false}], \"passed\": false}\n"},"fixed":{"elapsed_ms":66.445,"exit_code":0,"observations":[{"actual":1,"check":"boundary 1","expected":1,"passed":true},{"actual":0,"check":"boundary 2","expected":0,"passed":true},{"actual":0,"check":"boundary 3","expected":0,"passed":true},{"actual":2,"check":"boundary 4","expected":2,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"boundary 1\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"boundary 2\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"boundary 3\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"boundary 4\", \"actual\": 2, \"expected\": 2, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}