Document the node/kind fact.
Summary:
Somehow we managed never to explicitly write down that the node/kind fact is
actually a required part of the schema for nodes. It is so fundamental that we
apparently took it on background. Let's fix that.
Reviewers: zarko, #core_team
Subscribers: #core_team
@@ -1280,11 +1280,22 @@ Points toward::
Common node facts
-----------------
+[[nodekind]]
+node/kind
+~~~~~~~~~
+
+Brief description::
+ A node's *node/kind* is a label describing the role of the node in the graph.
+ The kind is the one fact every node must have in order to participate in the
+ rest of the schema.
+Attached to::
+ all nodes
+
[[code]]
code
~~~~
-Brief description:
+Brief description::
A node's *code* is a serialized link:marked-source.html[MarkedSource]
message that can be used to describe that node.
Attached to::
