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org: Special properties

 
 7.2 Special properties
 ======================
 
 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 (Column view), or to use them in
 queries.  The following property names are special and (except for
 ‘:CATEGORY:’) should not be used as keys in the properties drawer:
 
      ID           A globally unique ID used for synchronization during
                   iCalendar or MobileOrg export.
      TODO         The TODO keyword of the entry.
      TAGS         The tags defined directly in the headline.
      ALLTAGS      All tags, including inherited ones.
      CATEGORY     The category of an entry.
      PRIORITY     The priority of the entry, a string with a single letter.
      DEADLINE     The deadline time string, without the angular brackets.
      SCHEDULED    The scheduling timestamp, without the angular brackets.
      CLOSED       When was this entry closed?
      TIMESTAMP    The first keyword-less timestamp in the entry.
      TIMESTAMP_IA The first inactive timestamp in the entry.
      CLOCKSUM     The sum of CLOCK intervals in the subtree.  ‘org-clock-sum’
                   must 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-today’ must be run first to compute the
                   values in the current buffer.
      BLOCKED      "t" if task is currently blocked by children or siblings
      ITEM         The headline of the entry.
      FILE         The filename the entry is located in.
 

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