protected String resolveFormat(MemberScope<?, ?> member) {
        return this.getSchemaAnnotationValue(member, Schema::format, format -> !format.isEmpty())
                .orElse(null);
    }
Look-up the value from {@code @Schema(format = ...)} for the given field/method.

@param member field/method to look-up format for
@return format value or null
jsonschema-module-swagger-2/src/main/java/com/github/victools/jsonschema/module/swagger2/Swagger2Module.java