This is the official manual for the latest Org-mode release.
Special properties provide an alternative access method to Org mode features, like the TODO state or the priority of an entry, discussed in the previous chapters. This interface exists so that you can include these states in a column view (see Column view), or to use them in queries. The following property names are special and should not be used as keys in the properties drawer:
ALLTAGS All tags, including inherited ones. BLOCKED "t" if task is currently blocked by children or siblings. CLOCKSUM The sum of CLOCK intervals in the subtree.
org-clock-summust be run first to compute the values in the current buffer. CLOCKSUM_T The sum of CLOCK intervals in the subtree for today.
org-clock-sum-todaymust be run first to compute the values in the current buffer. CLOSED When was this entry closed? DEADLINE The deadline time string, without the angular brackets. FILE The filename the entry is located in. ITEM The headline of the entry. PRIORITY The priority of the entry, a string with a single letter. SCHEDULED The scheduling timestamp, without the angular brackets. TAGS The tags defined directly in the headline. TIMESTAMP The first keyword-less timestamp in the entry. TIMESTAMP_IA The first inactive timestamp in the entry. TODO The TODO keyword of the entry.