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Namespace prefixes are treated as part of element identity · case 01

Namespace prefixes are treated as part of element identity.

Verified by executionVariant 1 · 4 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The implementation applies an operation whose text or grammar semantics violate this contract: Return root element local name after expanded namespace resolution.

VERIFIED REPAIR

Implement the complete stated contract, including the boundary fixtures: Return root element local name after expanded namespace resolution.

Unsuccessful approach: The attempted repair handles the primary example but still violates a separate boundary of the same contract.

Case contract

Return root element local name after expanded namespace resolution.

Why this case matters

A local executable model for consumers of structured text; oracle values are authored literals, not outputs copied from the repaired implementation.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return ET.fromstring(x).tag
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('<a:x xmlns:a="urn:test"/>'), 'x')
check('boundary 2', solve('<x xmlns="urn:test"/>'), 'x')
check('boundary 3', solve('<plain/>'), 'plain')
check('boundary 4', solve('<a:b xmlns:a="urn:other"/>'), 'b')
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
boundary 1	`{urn:test}x`	`x`	Failed
boundary 2	`{urn:test}x`	`x`	Failed
boundary 3	`plain`	`plain`	Passed
boundary 4	`{urn:other}b`	`b`	Failed

SHA-256 / e204fccd7ea160157c461b7e0d572c9da0f4e37141b4242417eba0c735a15310

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return ET.fromstring(x).tag.split(':')[-1]
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('<a:x xmlns:a="urn:test"/>'), 'x')
check('boundary 2', solve('<x xmlns="urn:test"/>'), 'x')
check('boundary 3', solve('<plain/>'), 'plain')
check('boundary 4', solve('<a:b xmlns:a="urn:other"/>'), 'b')
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
boundary 1	`test}x`	`x`	Failed
boundary 2	`test}x`	`x`	Failed
boundary 3	`plain`	`plain`	Passed
boundary 4	`other}b`	`b`	Failed

SHA-256 / 4bbbf4d77f4d3ec5cd0a576afb0f4d5612e35d3bd69109c6420d92a23317c522

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import re, unicodedata, json, csv, io, html, base64, binascii, codecs, struct
from urllib.parse import quote, unquote, unquote_to_bytes, urlencode, parse_qsl, urlsplit, urlunsplit
from email.header import decode_header, make_header
from email.utils import getaddresses
from xml.etree import ElementTree as ET
import shlex, string, textwrap

N = 1
observations = []
def solve(x):
    try:
        return ET.fromstring(x).tag.rsplit('}',1)[-1]
    except Exception as exc:
        return {"error": type(exc).__name__}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('boundary 1', solve('<a:x xmlns:a="urn:test"/>'), 'x')
check('boundary 2', solve('<x xmlns="urn:test"/>'), 'x')
check('boundary 3', solve('<plain/>'), 'plain')
check('boundary 4', solve('<a:b xmlns:a="urn:other"/>'), 'b')
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)

Boundary fixture	Actual	Expected	Outcome
boundary 1	`x`	`x`	Passed
boundary 2	`x`	`x`	Passed
boundary 3	`plain`	`plain`	Passed
boundary 4	`b`	`b`	Passed

SHA-256 / ce6198ba1ab4d2e567fe606bb7c4988525dfd4e007b8bf73ae8e8f9b615b0161

Verification & scope

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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:37:23.193249+00:00.

Case digest / 94032fd18cb14543a355222a32c104bcf91553b1371c5f04b8e48c5e0b956f4e