Using the full text and metadata search field, you can search for metadata information such as author, publisher, title, place of publication, year of publication and keywords, as well as search the full texts. The input and research aid offers further information on how to specify a search query with truncation or Boolean operators. The number of hits can be subsequently restricted using various filters, e.g. by keywords, language or year of publication. Please note that the display of hits on iOS devices is currently still being adjusted.