618-reference-syntax
Name Variations Error Codes Remarks
EDGAR Filer Manual v48 6.18.1 page 6-58 2 Custom-Element-Has-Reference

REMARK: A company extension also cannot remove or change references in standard taxonomies (this is a technical consequence of the rule prohibiting URI fragments other than shorthand xpointers).

REMARK: This only applies to company extension linkbases. If there were a reference linkbase in edgartaxonomies.xml, then it would be included in a 'good' test variation.

EDGAR Filer Manual v48 6.18.2 page 6-59 1 Standard-Element-Has-Reference

REMARK: 6.19 reads "A company extension also cannot remove or change references in standard taxonomies (this is a technical consequence of the rule prohibiting URI fragments other than shorthand xpointers)." but this does not explicitly say the obvious point that you can't ADD authoritative references, either.