In languages in which third-person personal pronouns and demonstrative pronouns constitute separate word (sub)classes, demonstrative pronouns may substitute personal pronouns in subject position.

Types:

PP=Dem: Third-person personal pronouns are not distinguished from demonstrative pronouns.[1]

PPNonDemSubj: Third-person personal pronouns exist and they cannot be substituted in subject position by demonstrative pronouns.

PP~DemSubj: Although third-person personal pronouns exist, they can always be substituted in subject position by demonstrative pronouns.

SgPP~DemSubj: Although third-person pronouns exist, they can be substituted in subject position by singular demonstrative pronouns.

NonSgPP~DemSubj: Although third-person pronouns exist, they can be substituted in subject position by non-singular demonstrative pronouns.

PPNonAnim~DemSubj: Facultative use of demonstrative pronouns in subject position is permitted for nonhuman or nonliving entities, but only personal pronouns can be used for human or living entities.[2]

When a language displays more than one type of marking, two values can be listed. If one type is dominant, a slash (/) can separate the two values, with the dominant value appearing first; if neither is dominant, the two are listed with an ampersand (&) separating the two.

[1] The same value must also be present for the parameters Etymology of demonstrative and personal pronouns and Demonstrative and personal pronouns in non-subject position.

[2] This should be explained in the commentary.