Through one or more collections, one may let the text occur in an index that gathers texts by for example books or historical persons. A kind may be e.g. the value books or the value kings. At collect one may enter e.g. the name of a book, or the name of a king. The entries for section, subsection, subsubsection are optional, and may be used to further divide a collection into subcollections. There is some freedom how these entries may be used. E.g. section does not have to be a section number or name but can also be a volume number or page number. The left column does not have to be completely filled in, but e.g. subsubsection should only be used if subsection is also used.
Sorting of collections, sections, subsections, etc., is done by extracting up to three decimal numbers from the entered value. If any such numbers are equal, the values are compared lexicographically. When this is not suitable, for example because the values contain Roman numbers, then keys in the right column can be entered, which then override the values in the left column for the purpose of sorting. Otherwise, the keys can be left blank.