private PropertyMap instanceProperties() {
        PropertyMapBuilder builder = new PropertyMapBuilder();
        builder.put(ValidateProperty.ERROR_HANDLER, errorHandler);
        return builder.toPropertyMap();
    }
@param validationSchemaURI Extracted from application JAR when LSP loads.
integration/schema-language-server/lemminx-vespa/src/main/java/ai/vespa/lemminx/participants/DiagnosticsParticipant.java