Providingquickandeasyaccesstoelectroniccatal ogsofproductsisoneofthemostessentialparts in theelectronic catalogenvironment.Proposedinthispaperaredat aandquerymodelforelectronic catalogswhichoffereffectivesearchingandmanage mentfacilitiestocustomizetheelectroniccatalog system.Theproposedmodelseparatesthemanagement ofproductinformationandthevisual presentation.Productinformationisrepresentedas agraph.Themodelextendstherangeofelectronic catalogsfromproductinformationtothewholeweb documentsandtheirstructure.Theproposedquery languagemakestheextendedcatalogmoredynamic,f lexible,andeasytomaintain.