@startuml
skinparam shadowing false
skinparam monochrome true
skinparam packageStyle rectangle
skinparam backgroundColor FFFFFE

class Node

class Identifier {
    eq(other) -> bool
    neq(other) -> bool
    startswith(prefix: str, start, end) -> bool
}
Identifier -up-|> Node

class IdentifiedNode {
    toPython() -> str
}
IdentifiedNode -up-|> Identifier

class URIRef {
    n3(namespace_manager) -> str
    defrag() -> URIRef
    de_skolemize() -> BNode
}
URIRef -up-|> IdentifiedNode


class Genid
Genid -up-|> URIRef

class RDFLibGenid
RDFLibGenid -up-|> Genid

class BNode {
    n3(namespace_manager) -> str
    skolemize(authority, basepath) -> RDFLibGenid
}
BNode -up-|> IdentifiedNode

class Literal {
    datatype: Optional[str]
    lang: Optional[str]
    value: Any

    normalize() -> Literal
    n3(namespace_manager) -> str
    toPython() -> str
}
Literal -up-|> Identifier

class Variable {
    n3(namespace_manager) -> str
    toPython() -> str
}
Variable -up-|> Identifier

@enduml