SwiftDocCExternalMetadataStructureExternalMetadataExternal metadata injected into the documentation compiler, for example via command line arguments.struct ExternalMetadataTopicsInstance Propertiesvar currentPlatforms: [String : PlatformVersion]?The current version and beta information for platforms that may be encountered while processing symbol graph files.var diagnosticLevel: DiagnosticSeverityThe granularity of diagnostics to emit via the engine.var inheritDocs: BoolIf true, inherited symbols retain their original docs.var isGeneratedBundle: BoolIf true, there is no source bundle on disk and the inputs were passed via command line parameters.