Hi,

I've got an object model that I have a difficult time conceptualising how it might look like in Haskell:

class Element { }

class Inline : Element { }

class ParentInline : Inline {
   List<Inline> children;
}

class Bold : ParentInline { }
class Underline : ParentInline { }

class Link : ParentInline {
   String link;
}

class Text : Inline {
   String text;
}

class Block : Element { }

class Paragraph : Block {
   List<Inline> paragraph;
}

class Heading : Block {
   List<Inline> heading;
}

class Document : Element {
   List<Block> blocks;
}

How best to represent this OO data model in Haskell?

Thanks

-John