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+.. contents::
+   :depth: 3
+..
+
+Edge Rules
+==========
+
+-  `Edge Rules Location <#EdgeRules-EdgeRulesLocation>`__
+
+-  `How to Interpret an Edge
+   Rule <#EdgeRules-HowtoInterpretanEdgeRule>`__
+
+   -  `Mentally Constructing an
+      Edge <#EdgeRules-MentallyConstructinganEdge>`__
+
+      -  `Quick guide for which is your in node and which is your out
+         node <#EdgeRules-Quickguideforwhichisyourinnod>`__
+
+-  `How to Read Multiplicity <#EdgeRules-HowtoReadMultiplicity>`__
+
+-  `Internal Edge Properties <#EdgeRules-InternalEdgeProperties>`__
+
+   -  `Quick guide to our direction
+      syntax: <#EdgeRules-Quickguidetoourdirectionsynta>`__
+
+Edge Rules Location
+-------------------
+
+The edge rules json files are located in
+aai-common/aai-core/src/main/resources/dbedgerules.
+
+How to Interpret an Edge Rule
+-----------------------------
+
+Mentally Constructing an Edge
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Read the from/to/direction as a recipe for how to construct the edge.
+
+{
+
+    | "from": "tenant",
+    | "to": "vserver",
+    | "label": "owns",
+    | "direction": "OUT",
+    | "multiplicity": "One2Many",
+    | "contains-other-v": "${direction}",
+    | "delete-other-v": "NONE",
+    | "SVC-INFRA": "!${direction}",
+    | "prevent-delete": "${direction}"
+
+}
+
+1. Start by drawing the "from" node.
+
+2. Draw an edge off this node in the specified. So if it's OUT, point
+   the edge out away from the from node, if it's IN, point it into the
+   node.
+
+3. Draw the "to" node on the empty end of that edge.
+
+Essentially, "from" and "to" do not imply direction. Think of them as
+more like "NodeA" and "NodeB".
+
+Quick guide for which is your in node and which is your out node
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
++-----------------+---------------+----------------+
+| **direction**   | **in node**   | **out node**   |
++=================+===============+================+
+| OUT             | to            | from           |
++-----------------+---------------+----------------+
+| IN              | from          | to             |
++-----------------+---------------+----------------+
+
+How to Read Multiplicity
+------------------------
+
+Multiplicity, by itself, has nothing to do with the edge direction or
+the from/to nodes. Think of it as a property of the edge label. It
+defines how many IN edges of this label and how many OUT edges of this
+label are allowed. The format we use is defined by Titan to be In2Out.
+
+Ex: One2Many means on a node, there may be only one IN edge, and many
+OUT edges.
+
+The from and to node types come in on top of this at the A&AI layer.
+A&AI's code defines which node types may have those IN and OUT edges of
+this label.
+
+{
+
+    | "from": "tenant",
+    | "to": "vserver",
+    | "label": "owns",
+    | "direction": "OUT",
+    | "multiplicity": "One2Many",
+    | "contains-other-v": "${direction}",
+    | "delete-other-v": "NONE",
+    | "SVC-INFRA": "!${direction}",
+    | "prevent-delete": "${direction}"
+
+}
+
+In this example, the vserver gets the IN edge, so it may have only one
+edge from a tenant. The tenant gets the OUT edge, so it may get many
+edges to vservers.
+
+Internal Edge Properties
+------------------------
+
+A&AI uses the following edge properties for internal processing.
+
+-  contains-other-v
+
+   -  This property defines whether or not the other vertex is contained
+      within another when rendering the resources view
+
+   -  This property was previously known as isParent
+
+   -  If contains-other-v=OUT, this means that the outVertex contains
+      the inVertex
+
+   -  Or in other words, you can read contains-other-v=OUT as "I am an
+      edge, my OUT vertex contains my IN vertex"
+
+-  delete-other-v
+
+   -  defines whether or not the other vertex is automatically included
+      in delete processing
+
+   -  this property was previously known as hasDelTarget
+
+   -  if delete-other-v=IN, this means that when deleting the inVertex
+      also delete the outVertex
+
+-  SVC-INFRA
+
+   -  what direction should the traverser continue in when running
+      edge-tag-query
+
+   -  if SVC-INFRA=OUT, when on the outVertex traverse to the inVertex
+      and continue
+
+-  prevent-delete
+
+   -  defines whether or not this edge can be deleted from a particular
+      direction
+
+   -  if prevent-delete=IN, prevent the deletion of the inVertex of the
+      edge, allow the outVertex to be deleted.
+
+   -  Or in other words, you can read it as "I am an edge, my IN vertex
+      cannot be deleted"
+
+Quick guide to our direction syntax:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+${direction} = same as value of "direction" property
+
+!${direction} = opposite