diff -r ff0b52a6d72f -r 599c935aac82 src/Pure/PIDE/protocol.scala
--- a/src/Pure/PIDE/protocol.scala	Mon Nov 19 20:47:13 2012 +0100
+++ b/src/Pure/PIDE/protocol.scala	Mon Nov 19 22:34:17 2012 +0100
@@ -237,6 +237,7 @@
           { case Document.Node.Deps(header) =>
               val dir = Isabelle_System.posix_path(name.dir)
               val imports = header.imports.map(_.node)
+              val keywords = header.keywords.map({ case (a, b, _) => (a, b) })
               // FIXME val uses = deps.uses.map(p => (Isabelle_System.posix_path(p._1), p._2))
               val uses = header.uses
               (Nil,
@@ -244,7 +245,7 @@
                   pair(list(pair(Encode.string,
                     option(pair(pair(Encode.string, list(Encode.string)), list(Encode.string))))),
                   pair(list(pair(Encode.string, bool)), list(Encode.string))))))(
-                (dir, (name.theory, (imports, (header.keywords, (uses, header.errors))))))) },
+                (dir, (name.theory, (imports, (keywords, (uses, header.errors))))))) },
           { case Document.Node.Perspective(a) => (a.commands.map(c => long_atom(c.id)), Nil) }))
       def encode_edits: T[List[Document.Edit_Command]] = list((node_edit: Document.Edit_Command) =>
       {