String!
required
A stable code, such as E0101.
Int
1-based column on that line.
required
Suggested fixes, best first.
Int
1-based line in the document, when it has one.
String!
required
What is wrong.
required
How much it matters.
Objects
Diagnostic
A problem in a document. Its message names a diagnostics/<code> page in automationCatalog that explains it.