NL FR KVK 2.01 validation

[aaroncameron-wk]

Description of change

FR-KVK-2.01: The XBRL instance root node MUST contain attribute "xml:lang" with value "nl", "en", "de" or "fr"

Steps to Test

python arelleCmdLine.py -f ./tests/resources/validation/NL/example/a.xbrl 
--plugins="validate/NL" --validate --disclosureSystem NT17-preview

Result: no NL validation errors

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python arelleCmdLine.py -f ./tests/resources/validation/NL/fr_kvk/2.01/fail/invalid.xbrl 
--plugins="validate/NL" --validate --disclosureSystem NT17-preview

Result: Errors include [NL.FR-KVK-2.01] The XBRL instance root node MUST contain attribute "xml:lang" with one of the following values: de, en, fr, nl. Provided: zz - invalid.xbrl

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python arelleCmdLine.py -f ./tests/resources/validation/NL/fr_kvk/2.01/fail/missing.xbrl 
--plugins="validate/NL" --validate --disclosureSystem NT17-preview

Result: Errors include [NL.FR-KVK-2.01] The XBRL instance root node MUST contain attribute "xml:lang" with one of the following values: de, en, fr, nl. Provided: (none) - missing.xbrl

review:
@Arelle/arelle

[aviary-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[derekgengenbacher-wf]

QA +10 Testing locally succeeded.

[brettkail-wk]

Out of curiosity, would doc.xmlRootElement be more appropriate?