“content rules” are very similar to title Rules except that they match against an entry’s content rather than its title. For that reason, this section will be very brief– refer to title Rules for the details of each element.
In the score file (see The Score File), content rules are represented by seven properties:
:text
The match text
:value
The match value
:type
The match type as per above.
:date
Last match time
:tags
Tag scoping rules
:hits
Hit count
:feeds
Feed scoping rules
As above, only the first three elements are required, and elfeed-score will manage the last match time & hit count.