code: public RawStructuredQueryDefinition build(StructuredQueryDefinition... queries) {
      checkQueries(queries);
      return new RawQueryDefinitionImpl.Structured(
        new StructuredQueryXMLWriter(queries), builderOptionsURI
      );
    }
docs: Builds a structured query in XML from the list of query definitions.
  The structured query can be passed to the search() method of QueryManager.
  @param queries    the query definitions
  @return    the structured query