v0.3.1 with Saxon fully working

src/validation/validationTypes.ts

@@ -0,0 +1,18 @@
+export type DiagnosticSeverity = 'info' | 'warning' | 'error';
+
+export interface DiagnosticMessage {
+  severity: DiagnosticSeverity;
+  message: string;
+  source: string;
+  from?: number;
+  to?: number;
+}
+
+export interface ParsedXmlDocument {
+  document: Document;
+  diagnostics: DiagnosticMessage[];
+}
+
+export function hasErrors(diagnostics: DiagnosticMessage[]): boolean {
+  return diagnostics.some((diagnostic) => diagnostic.severity === 'error');
+}