src/Pure/Thy/sessions.scala

       }
 
       deps
     }
 
+    def build_hierarchy(session: String): List[String] =
+      if (build_graph.defined(session)) build_graph.all_preds(List(session))
+      else List(session)
+
     def build_selection(sel: Selection): List[String] = selected(build_graph, sel)
     def build_descendants(ss: List[String]): List[String] = build_graph.all_succs(ss)
     def build_requirements(ss: List[String]): List[String] = build_graph.all_preds_rev(ss)
     def build_topological_order: List[String] = build_graph.topological_order
-    def build_hierarchy(session: String): List[String] = build_graph.all_preds(List(session))
 
     def imports_selection(sel: Selection): List[String] = selected(imports_graph, sel)
     def imports_descendants(ss: List[String]): List[String] = imports_graph.all_succs(ss)
     def imports_requirements(ss: List[String]): List[String] = imports_graph.all_preds_rev(ss)
     def imports_topological_order: List[String] = imports_graph.topological_order
-    def imports_hierarchy(session: String): List[String] = imports_graph.all_preds(List(session))
 
     def bibtex_entries: List[(String, List[String])] =
       build_topological_order.flatMap(name =>
         apply(name).bibtex_entries match {
           case Nil => None