Help, How to define the relation?

[cdn_c]

Hi, There's a question!
I have some lines , each line have two node, each node can be one or more line's start node or end node.  I want to get :
for line : GetStartNode()  GetEndNode() 
for node : GetThroughLines()
for document: GetNodes()  GetLines() and others function
Can someone help me ???

[John van der Kist]

Not so difficult, really.

Create classes Doc, Node, Line
Create realation Doc  <>-->> Node (yielding a Node iterator)
Create realation Doc  <>-->> Line (yielding a Line iterator)
Create realation Node <>-->> Line, names StartNode and Line1
Create realation Node <>-->> Line, names EndNode   and Line2

Success,

John

If necessary, send me an email and I can send you the CBD file

[cdn_c]

Thanks very much! I get it!