Bug
A valid XBRL instance with a typed dimension fails conversion in Docling. Both Path and DocumentStream inputs fail at docling/backend/xml/xbrl_backend.py:344 because dim_value.memberQname is None for a typed member. The same dereference remains on main as of 2026-09-29.
Versions and validation
- Python 3.11.15, macOS arm64
docling==2.127.0, docling-core==2.96.0, docling-slim==2.127.0arelle-release==2.45.3python -m arelle.CntlrCmdLine --file typed.xml --validate --internetConnectivity offline --validationExitCode --logLevel INFO exits 0 and reports validated without validation errors for the two synthetic files below.
Minimal reproducer
Place these two files in one directory. All names and values are synthetic.
typed.xsd:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:t="https://example.invalid/o20/typed" targetNamespace="https://example.invalid/o20/typed" elementFormDefault="qualified">
<xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
<xs:element name="Revenue" id="t_Revenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration"/>
<xs:element name="RegionAxis" id="t_RegionAxis" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="true" xbrldt:typedDomainRef="typed.xsd#t_RegionDomain"/>
<xs:element name="RegionDomain" id="t_RegionDomain" type="xs:string"/>
</xs:schema>
typed.xml:
<?xml version="1.0" encoding="UTF-8"?>
<xbrli:xbrl xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:t="https://example.invalid/o20/typed">
<link:schemaRef xlink:type="simple" xlink:href="typed.xsd"/>
<xbrli:context id="c1"><xbrli:entity><xbrli:identifier scheme="https://example.invalid/entity">Entity</xbrli:identifier><xbrli:segment><xbrldi:typedMember dimension="t:RegionAxis"><t:RegionDomain>North</t:RegionDomain></xbrldi:typedMember></xbrli:segment></xbrli:entity><xbrli:period><xbrli:startDate>2024-01-01</xbrli:startDate><xbrli:endDate>2024-12-31</xbrli:endDate></xbrli:period></xbrli:context>
<xbrli:unit id="u1"><xbrli:measure>iso4217:USD</xbrli:measure></xbrli:unit>
<t:Revenue contextRef="c1" unitRef="u1" decimals="0">123</t:Revenue>
</xbrli:xbrl>
Run from that directory:
from io import BytesIO
from pathlib import Path
from docling.datamodel.base_models import DocumentStream, InputFormat
from docling.datamodel.backend_options import XBRLBackendOptions
from docling.document_converter import DocumentConverter, XBRLFormatOption
root = Path.cwd()
converter = DocumentConverter(
allowed_formats=[InputFormat.XML_XBRL],
format_options={
InputFormat.XML_XBRL: XBRLFormatOption(
backend_options=XBRLBackendOptions(
taxonomy=root,
enable_local_fetch=True,
enable_remote_fetch=False,
)
)
},
)
for source in (
root / "typed.xml",
DocumentStream(name="typed.xml", stream=BytesIO((root / "typed.xml").read_bytes())),
):
print(converter.convert(source).document.export_to_markdown())Actual / expected
For both inputs, converter.convert raises RuntimeError("Pipeline SimplePipeline failed"), caused by AttributeError("'NoneType' object has no attribute 'localName'") at xbrl_backend.py:344:
f"{dim_qname.localName}: {dim_value.memberQname.localName}"Arelle's ModelDimensionValue.memberQname is intentionally None for typed dimensions; the typed value is represented separately. Expected: conversion should retain the typed dimension value without this exception. This report concerns the typed dimension branch only; an invalid explicit member caused by missing taxonomy may reach the same line for a different reason.
Bug
A valid XBRL instance with a typed dimension fails conversion in Docling. Both
PathandDocumentStreaminputs fail atdocling/backend/xml/xbrl_backend.py:344becausedim_value.memberQnameisNonefor a typed member. The same dereference remains onmainas of 2026-09-29.Versions and validation
docling==2.127.0,docling-core==2.96.0,docling-slim==2.127.0arelle-release==2.45.3python -m arelle.CntlrCmdLine --file typed.xml --validate --internetConnectivity offline --validationExitCode --logLevel INFOexits 0 and reportsvalidatedwithout validation errors for the two synthetic files below.Minimal reproducer
Place these two files in one directory. All names and values are synthetic.
typed.xsd:typed.xml:Run from that directory:
Actual / expected
For both inputs,
converter.convertraisesRuntimeError("Pipeline SimplePipeline failed"), caused byAttributeError("'NoneType' object has no attribute 'localName'")atxbrl_backend.py:344:f"{dim_qname.localName}: {dim_value.memberQname.localName}"Arelle's
ModelDimensionValue.memberQnameis intentionallyNonefor typed dimensions; the typed value is represented separately. Expected: conversion should retain the typed dimension value without this exception. This report concerns the typed dimension branch only; an invalid explicit member caused by missing taxonomy may reach the same line for a different reason.