Hello,
Table RSWR_DATA contains BOOKMARKs created by Users. Entries with type 'P' means the personalization.
Table RSWR_DATA_XREF contains cross reference for the BOOKMARKs and will be also accessed only in case when the the object is saved or loaded.
Table RSWR_PERS contains personalization information for example, which User Personalized the object. This information linked to the BOOKMARK table in case that the BOOKMARK is personalized.
Attila