For all documents, it is recommended to create the attribute Comment (string of unlimited length). In this prop, users can write down various official notes on the document, which do not relate to the application specifics of the document (for example, the reason for marking for deletions, etc.). Access to props for users should be configured in the same way as for the document itself (if the document is available only for reading, then the comment is read-only; if there is a right document record, then the attribute value can also be changed).