diff --git a/src/Pure/PIDE/command.scala b/src/Pure/PIDE/command.scala
--- a/src/Pure/PIDE/command.scala
+++ b/src/Pure/PIDE/command.scala
@@ -1,681 +1,674 @@
 /*  Title:      Pure/PIDE/command.scala
     Author:     Fabian Immler, TU Munich
     Author:     Makarius
 
 Prover commands with accumulated results from execution.
 */
 
 package isabelle
 
 
 import scala.collection.mutable
 import scala.collection.immutable.SortedMap
 
 
 object Command
 {
   type Edit = (Option[Command], Option[Command])
 
   type Blob = Exn.Result[(Document.Node.Name, Option[(SHA1.Digest, Symbol.Text_Chunk)])]
   type Blobs_Info = (List[Blob], Int)
   val no_blobs: Blobs_Info = (Nil, -1)
 
 
   /** accumulated results from prover **/
 
   /* results */
 
   object Results
   {
     type Entry = (Long, XML.Tree)
     val empty: Results = new Results(SortedMap.empty)
     def make(args: TraversableOnce[Results.Entry]): Results = (empty /: args)(_ + _)
     def merge(args: TraversableOnce[Results]): Results = (empty /: args)(_ ++ _)
 
 
     /* XML data representation */
 
     val encode: XML.Encode.T[Results] = (results: Results) =>
     { import XML.Encode._; list(pair(long, tree))(results.rep.toList) }
 
     val decode: XML.Decode.T[Results] = (body: XML.Body) =>
     { import XML.Decode._; make(list(pair(long, tree))(body)) }
   }
 
   final class Results private(private val rep: SortedMap[Long, XML.Tree])
   {
     def is_empty: Boolean = rep.isEmpty
     def defined(serial: Long): Boolean = rep.isDefinedAt(serial)
     def get(serial: Long): Option[XML.Tree] = rep.get(serial)
     def iterator: Iterator[Results.Entry] = rep.iterator
 
     def + (entry: Results.Entry): Results =
       if (defined(entry._1)) this
       else new Results(rep + entry)
 
     def ++ (other: Results): Results =
       if (this eq other) this
       else if (rep.isEmpty) other
       else (this /: other.iterator)(_ + _)
 
     override def hashCode: Int = rep.hashCode
     override def equals(that: Any): Boolean =
       that match {
         case other: Results => rep == other.rep
         case _ => false
       }
     override def toString: String = iterator.mkString("Results(", ", ", ")")
   }
 
 
   /* exports */
 
   object Exports
   {
     type Entry = (Long, Export.Entry)
     val empty: Exports = new Exports(SortedMap.empty)
     def merge(args: TraversableOnce[Exports]): Exports = (empty /: args)(_ ++ _)
   }
 
   final class Exports private(private val rep: SortedMap[Long, Export.Entry])
   {
     def is_empty: Boolean = rep.isEmpty
     def iterator: Iterator[Exports.Entry] = rep.iterator
 
     def + (entry: Exports.Entry): Exports =
       if (rep.isDefinedAt(entry._1)) this
       else new Exports(rep + entry)
 
     def ++ (other: Exports): Exports =
       if (this eq other) this
       else if (rep.isEmpty) other
       else (this /: other.iterator)(_ + _)
 
     override def hashCode: Int = rep.hashCode
     override def equals(that: Any): Boolean =
       that match {
         case other: Exports => rep == other.rep
         case _ => false
       }
     override def toString: String = iterator.mkString("Exports(", ", ", ")")
   }
 
 
   /* markups */
 
   object Markup_Index
   {
     val markup: Markup_Index = Markup_Index(false, Symbol.Text_Chunk.Default)
   }
 
   sealed case class Markup_Index(status: Boolean, chunk_name: Symbol.Text_Chunk.Name)
 
   object Markups
   {
     val empty: Markups = new Markups(Map.empty)
     def init(markup: Markup_Tree): Markups = new Markups(Map(Markup_Index.markup -> markup))
     def merge(args: TraversableOnce[Markups]): Markups = (empty /: args)(_ ++ _)
 
 
     /* XML data representation */
 
     def encode(source_length: Int): XML.Encode.T[Markups] = (markups: Markups) =>
     {
       import XML.Encode._
 
       val markup_index: T[Markup_Index] = (index: Markup_Index) =>
         pair(bool, Symbol.Text_Chunk.encode_name)(index.status, index.chunk_name)
 
       val markup_tree: T[Markup_Tree] =
         _.to_XML(Text.Range(0, source_length), Symbol.spaces(source_length), Markup.Elements.full)
 
       list(pair(markup_index, markup_tree))(markups.rep.toList)
     }
 
     val decode: XML.Decode.T[Markups] = (body: XML.Body) =>
     {
       import XML.Decode._
 
       val markup_index: T[Markup_Index] = (body: XML.Body) =>
       {
         val (status, chunk_name) = pair(bool, Symbol.Text_Chunk.decode_name)(body)
         Markup_Index(status, chunk_name)
       }
 
       (Markups.empty /: list(pair(markup_index, Markup_Tree.from_XML(_)))(body))(_ + _)
     }
   }
 
   final class Markups private(private val rep: Map[Markup_Index, Markup_Tree])
   {
     def is_empty: Boolean = rep.isEmpty
 
     def apply(index: Markup_Index): Markup_Tree =
       rep.getOrElse(index, Markup_Tree.empty)
 
     def add(index: Markup_Index, markup: Text.Markup): Markups =
       new Markups(rep + (index -> (this(index) + markup)))
 
     def + (entry: (Markup_Index, Markup_Tree)): Markups =
     {
       val (index, tree) = entry
       new Markups(rep + (index -> (this(index).merge(tree, Text.Range.full, Markup.Elements.full))))
     }
 
     def ++ (other: Markups): Markups =
       if (this eq other) this
       else if (rep.isEmpty) other
       else (this /: other.rep.iterator)(_ + _)
 
     def redirection_iterator: Iterator[Document_ID.Generic] =
       for (Markup_Index(_, Symbol.Text_Chunk.Id(id)) <- rep.keysIterator)
         yield id
 
     def redirect(other_id: Document_ID.Generic): Markups =
     {
       val rep1 =
         (for {
           (Markup_Index(status, Symbol.Text_Chunk.Id(id)), markup) <- rep.iterator
           if other_id == id
         } yield (Markup_Index(status, Symbol.Text_Chunk.Default), markup)).toMap
       if (rep1.isEmpty) Markups.empty else new Markups(rep1)
     }
 
     override def hashCode: Int = rep.hashCode
     override def equals(that: Any): Boolean =
       that match {
         case other: Markups => rep == other.rep
         case _ => false
       }
     override def toString: String = rep.iterator.mkString("Markups(", ", ", ")")
   }
 
 
   /* state */
 
   object State
   {
     def get_result(states: List[State], serial: Long): Option[XML.Tree] =
       states.find(st => st.results.defined(serial)).map(st => st.results.get(serial).get)
 
     def get_result_proper(states: List[State], props: Properties.T): Option[Results.Entry] =
       for {
         serial <- Markup.Serial.unapply(props)
         tree @ XML.Elem(_, body) <- get_result(states, serial)
         if body.nonEmpty
       } yield (serial -> tree)
 
     def merge_results(states: List[State]): Results =
       Results.merge(states.map(_.results))
 
     def merge_exports(states: List[State]): Exports =
       Exports.merge(states.map(_.exports))
 
     def merge_markups(states: List[State]): Markups =
       Markups.merge(states.map(_.markups))
 
     def merge_markup(states: List[State], index: Markup_Index,
         range: Text.Range, elements: Markup.Elements): Markup_Tree =
       Markup_Tree.merge(states.map(_.markup(index)), range, elements)
 
     def merge(command: Command, states: List[State]): State =
       State(command, states.flatMap(_.status), merge_results(states),
         merge_exports(states), merge_markups(states))
 
 
     /* XML data representation */
 
     val encode: XML.Encode.T[State] = (st: State) =>
     {
       import XML.Encode._
 
       val command = st.command
       val blobs_names = command.blobs_names.map(_.node)
       val blobs_index = command.blobs_index
       require(command.blobs_ok)
 
       pair(long, pair(string, pair(pair(list(string), int), pair(Command_Span.encode,
           pair(list(Markup.encode), pair(Results.encode, Markups.encode(command.source.length)))))))(
         (command.id, (command.node_name.node, ((blobs_names, blobs_index), (command.span,
           (st.status, (st.results, st.markups)))))))
     }
 
     def decode(node_name: String => Document.Node.Name): XML.Decode.T[State] = (body: XML.Body) =>
     {
       import XML.Decode._
       val (id, (node, ((blobs_names, blobs_index), (span, (status, (results, markups)))))) =
         pair(long, pair(string, pair(pair(list(string), int), pair(Command_Span.decode,
           pair(list(Markup.decode), pair(Results.decode, Markups.decode))))))(body)
 
       val blobs_info: Blobs_Info =
         (blobs_names.map(name => Exn.Res((node_name(name), None)): Blob), blobs_index)
       val command = Command(id, node_name(node), blobs_info, span)
       State(command, status, results, Exports.empty, markups)
     }
   }
 
   sealed case class State(
     command: Command,
     status: List[Markup] = Nil,
     results: Results = Results.empty,
     exports: Exports = Exports.empty,
     markups: Markups = Markups.empty)
   {
     def initialized: Boolean = status.exists(markup => markup.name == Markup.INITIALIZED)
     def consolidating: Boolean = status.exists(markup => markup.name == Markup.CONSOLIDATING)
     def consolidated: Boolean = status.exists(markup => markup.name == Markup.CONSOLIDATED)
 
     lazy val maybe_consolidated: Boolean =
     {
       var touched = false
       var forks = 0
       var runs = 0
       for (markup <- status) {
         markup.name match {
           case Markup.FORKED => touched = true; forks += 1
           case Markup.JOINED => forks -= 1
           case Markup.RUNNING => touched = true; runs += 1
           case Markup.FINISHED => runs -= 1
           case _ =>
         }
       }
       touched && forks == 0 && runs == 0
     }
 
     lazy val document_status: Document_Status.Command_Status =
     {
       val warnings =
         if (results.iterator.exists(p => Protocol.is_warning(p._2) || Protocol.is_legacy(p._2)))
           List(Markup(Markup.WARNING, Nil))
         else Nil
       val errors =
         if (results.iterator.exists(p => Protocol.is_error(p._2)))
           List(Markup(Markup.ERROR, Nil))
         else Nil
       Document_Status.Command_Status.make((warnings ::: errors ::: status).iterator)
     }
 
     def markup(index: Markup_Index): Markup_Tree = markups(index)
 
     def redirect(other_command: Command): Option[State] =
     {
       val markups1 = markups.redirect(other_command.id)
       if (markups1.is_empty) None
       else Some(new State(other_command, markups = markups1))
     }
 
     private def add_status(st: Markup): State =
       copy(status = st :: status)
 
     private def add_result(entry: Results.Entry): State =
       copy(results = results + entry)
 
     def add_export(entry: Exports.Entry): Option[State] =
       if (command.node_name.theory == entry._2.theory_name) Some(copy(exports = exports + entry))
       else None
 
     private def add_markup(
       status: Boolean, chunk_name: Symbol.Text_Chunk.Name, m: Text.Markup): State =
     {
       val markups1 =
         if (status || Document_Status.Command_Status.liberal_elements(m.info.name))
           markups.add(Markup_Index(true, chunk_name), m)
         else markups
       copy(markups = markups1.add(Markup_Index(false, chunk_name), m))
     }
 
     def accumulate(
         self_id: Document_ID.Generic => Boolean,
         other_id: Document_ID.Generic => Option[(Symbol.Text_Chunk.Id, Symbol.Text_Chunk)],
         message: XML.Elem,
         xml_cache: XML.Cache): State =
       message match {
         case XML.Elem(Markup(Markup.STATUS, _), msgs) =>
           if (command.span.is_theory) this
           else {
             (this /: msgs)((state, msg) =>
               msg match {
                 case elem @ XML.Elem(markup, Nil) =>
                   state.
                     add_status(markup).
                     add_markup(true, Symbol.Text_Chunk.Default, Text.Info(command.core_range, elem))
                 case _ =>
                   Output.warning("Ignored status message: " + msg)
                   state
               })
           }
 
         case XML.Elem(Markup(Markup.REPORT, _), msgs) =>
           (this /: msgs)((state, msg) =>
             {
               def bad(): Unit = Output.warning("Ignored report message: " + msg)
 
               msg match {
                 case XML.Elem(Markup(name, atts), args) =>
                   command.reported_position(atts) match {
                     case Some((id, chunk_name)) =>
                       val target =
                         if (self_id(id) && command.chunks.isDefinedAt(chunk_name))
                           Some((chunk_name, command.chunks(chunk_name)))
                         else if (chunk_name == Symbol.Text_Chunk.Default) other_id(id)
                         else None
 
                       (target, atts) match {
                         case (Some((target_name, target_chunk)), Position.Range(symbol_range)) =>
                           target_chunk.incorporate(symbol_range) match {
                             case Some(range) =>
                               val props = Position.purge(atts)
                               val elem = xml_cache.elem(XML.Elem(Markup(name, props), args))
                               state.add_markup(false, target_name, Text.Info(range, elem))
                             case None => bad(); state
                           }
                         case _ =>
                           // silently ignore excessive reports
                           state
                       }
 
-                    case None
-                    if !atts.exists({ case (a, _) => Markup.POSITION_PROPERTIES(a) }) =>
-                      val range = command.core_range
-                      val props = Position.purge(atts)
-                      val elem = xml_cache.elem(XML.Elem(Markup(name, props), args))
-                      state.add_markup(false, Symbol.Text_Chunk.Default, Text.Info(range, elem))
-
                     case _ => bad(); state
                   }
                 case _ => bad(); state
               }
             })
 
         case XML.Elem(Markup(name, props), body) =>
           props match {
             case Markup.Serial(i) =>
               val markup_message =
                 xml_cache.elem(XML.Elem(Markup(Markup.message(name), props), body))
               val message_markup =
                 xml_cache.elem(XML.elem(Markup(name, props.filter(p => p._1 == Markup.SERIAL))))
 
               var st = add_result(i -> markup_message)
               if (Protocol.is_inlined(message)) {
                 for {
                   (chunk_name, chunk) <- command.chunks.iterator
                   range <- command.message_positions(self_id, chunk_name, chunk, message)
                 } st = st.add_markup(false, chunk_name, Text.Info(range, message_markup))
               }
               st
 
             case _ =>
               Output.warning("Ignored message without serial number: " + message)
               this
           }
       }
   }
 
 
 
   /** static content **/
 
   /* make commands */
 
   def apply(
     id: Document_ID.Command,
     node_name: Document.Node.Name,
     blobs_info: Blobs_Info,
     span: Command_Span.Span): Command =
   {
     val (source, span1) = span.compact_source
     new Command(id, node_name, blobs_info, span1, source, Results.empty, Markup_Tree.empty)
   }
 
   val empty: Command =
     Command(Document_ID.none, Document.Node.Name.empty, no_blobs, Command_Span.empty)
 
   def unparsed(
     source: String,
     theory: Boolean = false,
     id: Document_ID.Command = Document_ID.none,
     node_name: Document.Node.Name = Document.Node.Name.empty,
     results: Results = Results.empty,
     markup: Markup_Tree = Markup_Tree.empty): Command =
   {
     val (source1, span1) = Command_Span.unparsed(source, theory).compact_source
     new Command(id, node_name, no_blobs, span1, source1, results, markup)
   }
 
   def text(source: String): Command = unparsed(source)
 
   def rich_text(id: Document_ID.Command, results: Results, body: XML.Body): Command =
     unparsed(XML.content(body), id = id, results = results, markup = Markup_Tree.from_XML(body))
 
 
   /* perspective */
 
   object Perspective
   {
     val empty: Perspective = Perspective(Nil)
   }
 
   sealed case class Perspective(commands: List[Command])  // visible commands in canonical order
   {
     def is_empty: Boolean = commands.isEmpty
 
     def same(that: Perspective): Boolean =
     {
       val cmds1 = this.commands
       val cmds2 = that.commands
       require(!cmds1.exists(_.is_undefined))
       require(!cmds2.exists(_.is_undefined))
       cmds1.length == cmds2.length &&
         (cmds1.iterator zip cmds2.iterator).forall({ case (c1, c2) => c1.id == c2.id })
     }
   }
 
 
   /* blobs: inlined errors and auxiliary files */
 
   private def clean_tokens(tokens: List[Token]): List[(Token, Int)] =
   {
     def clean(toks: List[(Token, Int)]): List[(Token, Int)] =
       toks match {
         case (t1, i1) :: (t2, i2) :: rest =>
           if (t1.is_keyword && t1.source == "%" && t2.is_name) clean(rest)
           else (t1, i1) :: clean((t2, i2) :: rest)
         case _ => toks
       }
     clean(tokens.zipWithIndex.filter({ case (t, _) => t.is_proper }))
   }
 
   private def find_file(tokens: List[(Token, Int)]): Option[(String, Int)] =
     if (tokens.exists({ case (t, _) => t.is_command })) {
       tokens.dropWhile({ case (t, _) => !t.is_command }).
         collectFirst({ case (t, i) if t.is_embedded => (t.content, i) })
     }
     else None
 
   def span_files(syntax: Outer_Syntax, span: Command_Span.Span): (List[String], Int) =
     syntax.load_command(span.name) match {
       case Some(exts) =>
         find_file(clean_tokens(span.content)) match {
           case Some((file, i)) =>
             if (exts.isEmpty) (List(file), i)
             else (exts.map(ext => file + "." + ext), i)
           case None => (Nil, -1)
         }
       case None => (Nil, -1)
     }
 
   def blobs_info(
     resources: Resources,
     syntax: Outer_Syntax,
     get_blob: Document.Node.Name => Option[Document.Blob],
     can_import: Document.Node.Name => Boolean,
     node_name: Document.Node.Name,
     span: Command_Span.Span): Blobs_Info =
   {
     span.name match {
       // inlined errors
       case Thy_Header.THEORY =>
         val reader = Scan.char_reader(Token.implode(span.content))
         val imports_pos = resources.check_thy_reader(node_name, reader).imports_pos
         val raw_imports =
           try {
             val read_imports = Thy_Header.read(reader, Token.Pos.none).imports
             if (imports_pos.length == read_imports.length) read_imports else error("")
           }
           catch { case exn: Throwable => List.fill(imports_pos.length)("") }
 
         val errors =
           for { ((import_name, pos), s) <- imports_pos zip raw_imports if !can_import(import_name) }
           yield {
             val completion =
               if (Thy_Header.is_base_name(s)) resources.complete_import_name(node_name, s) else Nil
             val msg =
               "Bad theory import " +
                 Markup.Path(import_name.node).markup(quote(import_name.toString)) +
                 Position.here(pos) + Completion.report_theories(pos, completion)
             Exn.Exn(ERROR(msg)): Command.Blob
           }
         (errors, -1)
 
       // auxiliary files
       case _ =>
         val (files, index) = span_files(syntax, span)
         val blobs =
           files.map(file =>
             (Exn.capture {
               val name = Document.Node.Name(resources.append(node_name, Path.explode(file)))
               val blob = get_blob(name).map(blob => ((blob.bytes.sha1_digest, blob.chunk)))
               (name, blob)
             }).user_error)
         (blobs, index)
     }
   }
 }
 
 
 final class Command private(
     val id: Document_ID.Command,
     val node_name: Document.Node.Name,
     val blobs_info: Command.Blobs_Info,
     val span: Command_Span.Span,
     val source: String,
     val init_results: Command.Results,
     val init_markup: Markup_Tree)
 {
   override def toString: String = id + "/" + span.kind.toString
 
 
   /* classification */
 
   def is_proper: Boolean = span.kind.isInstanceOf[Command_Span.Command_Span]
   def is_ignored: Boolean = span.kind == Command_Span.Ignored_Span
 
   def is_undefined: Boolean = id == Document_ID.none
   val is_unparsed: Boolean = span.content.exists(_.is_unparsed)
   val is_unfinished: Boolean = span.content.exists(_.is_unfinished)
 
   def potentially_initialized: Boolean = span.name == Thy_Header.THEORY
 
 
   /* blobs */
 
   def blobs: List[Command.Blob] = blobs_info._1
   def blobs_index: Int = blobs_info._2
 
   def blobs_ok: Boolean =
     blobs.forall({ case Exn.Res(_) => true case _ => false })
 
   def blobs_names: List[Document.Node.Name] =
     for (Exn.Res((name, _)) <- blobs) yield name
 
   def blobs_undefined: List[Document.Node.Name] =
     for (Exn.Res((name, None)) <- blobs) yield name
 
   def blobs_defined: List[(Document.Node.Name, SHA1.Digest)] =
     for (Exn.Res((name, Some((digest, _)))) <- blobs) yield (name, digest)
 
   def blobs_changed(doc_blobs: Document.Blobs): Boolean =
     blobs.exists({ case Exn.Res((name, _)) => doc_blobs.changed(name) case _ => false })
 
 
   /* source chunks */
 
   val chunk: Symbol.Text_Chunk = Symbol.Text_Chunk(source)
 
   val chunks: Map[Symbol.Text_Chunk.Name, Symbol.Text_Chunk] =
     ((Symbol.Text_Chunk.Default -> chunk) ::
       (for (Exn.Res((name, Some((_, file)))) <- blobs)
         yield Symbol.Text_Chunk.File(name.node) -> file)).toMap
 
   def length: Int = source.length
   def range: Text.Range = chunk.range
 
   val core_range: Text.Range =
     Text.Range(0,
       (length /: span.content.reverse.iterator.takeWhile(_.is_ignored))(_ - _.source.length))
 
   def source(range: Text.Range): String = range.substring(source)
 
 
   /* reported positions */
 
   def reported_position(pos: Position.T): Option[(Document_ID.Generic, Symbol.Text_Chunk.Name)] =
     pos match {
       case Position.Id(id) =>
         val chunk_name =
           pos match {
             case Position.File(name) if name != node_name.node =>
               Symbol.Text_Chunk.File(name)
             case _ => Symbol.Text_Chunk.Default
           }
         Some((id, chunk_name))
       case _ => None
     }
 
   def message_positions(
     self_id: Document_ID.Generic => Boolean,
     chunk_name: Symbol.Text_Chunk.Name,
     chunk: Symbol.Text_Chunk,
     message: XML.Elem): Set[Text.Range] =
   {
     def elem(props: Properties.T, set: Set[Text.Range]): Set[Text.Range] =
       reported_position(props) match {
         case Some((id, name)) if self_id(id) && name == chunk_name =>
           val opt_range =
             Position.Range.unapply(props) orElse {
               if (name == Symbol.Text_Chunk.Default)
                 Position.Range.unapply(span.position)
               else None
             }
           opt_range match {
             case Some(symbol_range) =>
               chunk.incorporate(symbol_range) match {
                 case Some(range) => set + range
                 case _ => set
               }
             case None => set
           }
         case _ => set
       }
     def tree(set: Set[Text.Range], t: XML.Tree): Set[Text.Range] =
       t match {
         case XML.Wrapped_Elem(Markup(name, props), _, body) =>
           body.foldLeft(if (Rendering.position_elements(name)) elem(props, set) else set)(tree)
         case XML.Elem(Markup(name, props), body) =>
           body.foldLeft(if (Rendering.position_elements(name)) elem(props, set) else set)(tree)
         case XML.Text(_) => set
       }
 
     val set = tree(Set.empty, message)
     if (set.isEmpty) elem(message.markup.properties, set)
     else set
   }
 
 
   /* accumulated results */
 
   val init_state: Command.State =
     Command.State(this, results = init_results, markups = Command.Markups.init(init_markup))
 
   val empty_state: Command.State = Command.State(this)
 }