Nodey

abstract Node {
    +ChildIndex_t getNumberOfChildren() const
    +Node* getChild(ChildIndex_t) const
    +void setChild(ChildIndex_t, UniqueNodePtr)
    +ChildIndex_t getIndexOfChild(Node*) const
    --
    +string getType() const
    +void setFolded(bool)
    +bool isFolded() const
    +string getDescriptionText() const
    +void setDescriptionText(string)
    --
    +UniqueNodePtr clone() const
}

class IndexList {
    +list<ChildIndex_t> indices;
}

interface Document {
    +UniqueNodePtr getRootNode()
    +IndexList getPathToSelectedNode()
    +void setPathToSelectedNode(IndexList)
    --
    +void executeCommand(UniqueCommandPtr)
    +void undoLastCommand()
}
Document --> Node : <<contains>>
Document --> IndexList : <<contains>>

interface Command {
    +void executeOn(Document*)
}
Command ..> Document : <<modifies>>

interface Language {
    +string translate(Node*)
    +UniqueNodePtr createNodeByType(string)
    +UniqueCommandPtr createCommandByName(string)
}
Language ..> Node : <<use/create>>
Language ..> Command : <<create>>

interface LanguageLoader {
    +UniqueLanguagePtr loadLanguage(string pathToLib)
}
LanguageLoader ..> Language : <<create>>