The modern scientific world is enormous and actively growing, the number of research papers is rapidly and constantly getting bigger. For each scientist there is an actual task – how to not get lost here. In other words – how to identify the piece of intellectual property in online environment, to save and transfer its accurate and permanent location. Nowadays one of the most popular approach is using so called Digital Object Identifier – DOI. It can be assigned for any types of the content: Book Series, Conference Proceedings, Dissertations and Thesis, Technical Reports, Standards, Papers, etc.
DOI system is a transparent systems for unique name assignment. A proper DOI name is considered as a serial code consisting of a string of characters divided into two parts and separated by a slash. First part – prefix (before slash) identifies the registrant, and the second part – suffix (after slash) identifies a proper dataset. All DOI prefixes begin with “10” to distinguish the DOI from other implementation of the Handle System (https://www.doi.org/factsheets/DOIHandle.html)
DOI is strongly connected with paper Metadate that provides information about the object and URL defining the object location. Paper Metadate and URL can be changed during the time, whereas the DOI remains stable over the lifetime. Scientific publishers assign DOIs for each published document, the publication can even be considered not full enough if it has not been assigned the DOI number.
DOI numbers do not replace traditional bibliographic citations but are very useful and efficient addition, especially for online papers. Once the DOI was assigned to the online published paper it should be included in the header for the print version of the paper. It is a fixed link to the paper on the Internet. Strictly speaking DOI should be a part of the standard bibliographic metadata for a paper. In the future, a DOI will be clickable and will be considered as a URL. However, it will differ from URL, since it will identify an object, not a location where the object is located.