--- /dev/null
+.. 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
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