Coreference   (AMR annotation guidance)

Coreference is expressed through shared variables such as the b in:

Example:  "The boy lost his toy."
     (l / lose-02
           :ARG0 (b / boy)
           :ARG1 (t / toy
                 :poss b))

Example:  "The boy wants to eat an apple."
     (w / want-01
           :ARG0 (b / boy)
           :ARG1 (e / eat-01
                 :ARG0 b
                 :ARG1 (a / apple)))

Example:  "When he opened his eyes, John tried not to look at himself."
     (t / try-01
           :ARG0 (p / person :wiki - :name (n / name :op1 "John"))
           :ARG1 (l / look-01 :polarity -
                 :ARG0 p
                 :ARG1 p)
           :time (o / open-01
                 :ARG0 p
                 :ARG1 (e / eye
                       :part-of p)))

Make sure to resolve the pronouns in quoted speech semantically:

Example:  The boy said, "I am hungry."
     (s / say-01
           :ARG0 (b / boy)
           :ARG1 (h / hunger-01
                 :ARG0 b))

Example:  "We are roses," said the roses.
     (s / say-01
           :ARG0 (r / rose)
           :ARG1 (r2 / rose
                 :domain r))

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