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[GitHub] mbeckerle commented on a change in pull request #61: Base64, gzip, and line-folding layering

mbeckerle commented on a change in pull request #61: Base64, gzip, and line-folding layering

 File path: daffodil-core/src/main/scala/org/apache/daffodil/grammar/primitives/LayeredSequence.scala
 @@ -0,0 +1,60 @@
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
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+ * The ASF licenses this file to You under the Apache License, Version 2.0
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+package org.apache.daffodil.grammar.primitives
+import org.apache.daffodil.grammar.Terminal
+import org.apache.daffodil.dsom._
+import org.apache.daffodil.processors.parsers.{ Parser => DaffodilParser }
+import org.apache.daffodil.processors.unparsers.{ Unparser => DaffodilUnparser }
+import org.apache.daffodil.grammar.Gram
+import org.apache.daffodil.grammar.EmptyGram
+import org.apache.daffodil.util.Misc
+import org.apache.daffodil.processors.parsers.LayeredSequenceParser
+import org.apache.daffodil.processors.unparsers.LayeredSequenceUnparser
+case class LayeredSequence(sq: SequenceTermBase, rawTerms: Seq[Gram])
+  extends Terminal(sq, true) {
 Review comment:
   The nest you give of LayeredSequence(this, SequenceCombinator(this, terms)) actually has different meaning. For the same reason that it is undesirable to put layering properties on the same sequence that is also carrying other properties. It becomes ambiguous which happens first: 
   E.g., in 
   <sequence dfdl:layerTransform="base64_MIME" dfdl:initiator="foo:"... >
   Do we decode base64 first, then look for the initiator, or the other way round? By requiring a separate sequence things are 100% unambiguous, so I'd rather keep things this way for now. 

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