Twenty years of identification of online continuing resources: changed in transition

Sa？etak The ISSN network has for the past twenty years identified and catalogued online continuing resources by use of adopted definitions, rules and recommendations. Purpose of the article is to give an overview of the current definitions and rules for identifying and cataloguing of online continuing resources of the ISSN system, an overview of noticed changes of the content features published online in relation to their printed original and reasons for their creation. Noticed changes point to the gradual and unavoidable change in the rules for the identification and cataloguing and development of online serial publications as well as the gradual change of the publishing paradigm