The paper deals with the issue of the method of arrangement of the results of a opac search. For this reason. the paper presents the conceptual structure of shelf classified arrangement of documents (filiatory sequence) by Colon Classification. It shows with examples that filiatory sequence complies with principles provided for bibliographies by Pollard and Krummel. https://www.hollandscountryclothinges.shop/product-category/wide-brim-hats/