This category allows you to index the content of your publication by selecting different descriptors or keywords. A keyword is a term used to describe the factual content of a work; it is as short as possible, while still being accurate and complete. You can enter all your keywords in this field, regardless of the language. Separate multiple keywords with " ; ". Please note: A classification system for subject indexing (e.g. DDC, RVK (Regensburger Verbundklassifikation), or other subject classification systems) is not currently possible. We are working on this. You can enter this information in the "Internal note to library staff" field.