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Prevent (or list) musical notation with syntax errors
Open, Needs TriagePublic

Description

Problem: Wikibase lets users write free text as a value for the "Musical Notation" data type. When a syntax error is introduced, the value is accepted and saved and the following message appears.

invalid-lilypond.png (326×948 px, 14 KB)

Syntax errors should be prevented or, if that's not possible/convenient, listed on some page to easily access and fix them.