Class Hierarchy
- Object
- OptDirectedEdge.RelatedIterator (implements Iterator<E>)
 - OptDirectedNode.RelatedIterator (implements Iterator<E>)
 - OptEdge.RelatedIterator (implements Iterator<E>)
 - OptGraphable (implements Graphable, Serializable)
- OptDirectedEdge (implements DirectedEdge)
 - OptDirectedNode (implements DirectedNode)
 - OptEdge (implements Edge)
 - OptNode (implements Node)
 
 - OptNode.RelatedIterator (implements Iterator<E>)