Answer stability round 2, prose round 2 and product-owner round 2: a head may be a name, scope and link come before the entries using them, a path reaches a node, and resolve ties a reference or a name

data.go

@@ -66,8 +66,8 @@ func mergeChildren(dst, src map[string]node) {
 	}
 }
 
-// nodeSet is the set of nodes one validation pass covers: the categories one load
-// reads, or a single inline node.
+// nodeSet is the set of nodes one validation pass covers: one load's categories, or a
+// single inline node.
 type nodeSet func(fn func(label string, n node) error) error
 
 // categorySite is a loaded category and where it sits: the folder holding it, that