- DOCUMENT@0..18
    - OBJECT_TYPE_EXTENSION@0..18
        - extend_KW@0..6 "extend"
        - WHITESPACE@6..7 " "
        - type_KW@7..11 "type"
        - WHITESPACE@11..12 " "
        - NAME@12..18
            - IDENT@12..18 "Person"
- ERROR@18:18 "expected an Implements Interface, Directives or a Fields Definition" EOF
