I'd like to know if it is possible to create a Vertex that requires an edge 
in order to be created. 

For example, I want to create an Invoice class that has a HasCustomer edge 
which points to Person. 

I want the HasCustomer edge to be mandatory in order to create the Invoice. 

You cannot create the Invoice unless you have the HasCustomer edge.

I know we can have a link to Person, but there is no referential integrity. 
I can delete the Person and the Invoice will simply end up with a link to a 
customer that is non-existent.

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