code: public void setSchemaUrl(String schemaUrl) {
          if (schemaUrl != null && !schemaUrl.startsWith("http:")) {
              throw new IllegalArgumentException("schemaUrl should be a URL");
          }
          this.schemaUrl = schemaUrl;
      }
docs: Default value is {@value #SCHEMA_URL}
  
  @param schemaUrl
  url to the required schema