My use case is pretty common. I have an XML which contains data about 
entities and relationships among them. For each node I create a class, 
except from the ones that represent relationships. In this case I create 
edges. My question is about the hierarchy. 
Suppose I a structure as below. Take into account that the hierarchy is not 
fixed, but you know that a Forum belongs to a Package. 

<Package name = "groups">
       <Package name = "google">
            <Package name = "com">
                <Package name = "forums">
                        <Forum name="OrientDB">
                               <Calls type="Forum">Java</Calls>
                        </Forum>
                </Package>
            </Package>
      </Package>
</Package>



How do you usually model your solution? I would like to retrieve the 
complete package of a forum, for example. "groups.google.com.forums". Or 
maybe the opposite, all forums that belongs to "groups", regardless of 
the depth.

I have create Edges named belongs_to, but not sure if it's a proper 
solution. What do you think?

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