ch06 fixup

ch06.asciidoc

@@ -134,12 +134,9 @@ When transactions are transmitted over the network or exchanged between applicat
 | Variable | Locking-Script | A script defining the conditions needed to spend the output
 |=======
 
-////
-You need a transition sentence explaining that people don't use serialized data internally in their programs -
-However, most programs do not store data in the serialized format and need to....
-////
+Most bitcoin libraries and frameworks do not store transactions internally as byte-streams, as that would require complex parsing every time you needed to access a single field. For convenience and readability, bitcoin libraries store transactions internally in data structures (usually object-oriented structures). 
 
-The process of converting from the byte-stream representation of a transaction to whatever data structure (e.g. a transaction object) is used to store transactions internally in your program, is called _de-serialization_ or _transaction parsing_. (((de-serialization)))Most bitcoin libraries have functions for transaction serialization and de-serialization.
+The process of converting from the byte-stream representation of a transaction to a library's internal representation data structure is called (((de-serialization)))_de-serialization_ or _transaction parsing_. The process of converting back to a byte-stream for transmission over the network, for hashing or for storage on disk is called (((serialization)))_serialization_.  Most bitcoin libraries have built-in functions for transaction serialization and de-serialization.
 
 See if you can manually decode Alice's transaction from the serialized hexadecimal form, finding some of the elements we saw above. The section containing the two outputs is highlighted to help you: