anchor.diff:  ==== Receive
   
   A variation of the above: Instead of +READ FILE "pattern"+ just enter +RECEIVE+
  -and ramen will accept CSV file POSTed at +/upload/node_fully_qualified_name/+
  +and Ramen will accept CSV file POSTed at +/upload/node_fully_qualified_name/+
   and will process them as they were CSV files taken from the file system.
   
   Notice that in that case the CSV file will not be kept in the file system and
  
positive.code: GROUP BY expression1, expression2, ...
  ----
  
  You can mix stateful functions drawing their state from the group the tuple at
  hands belong to, with stateful functions having a global state. Where a
  stateful function draws its state from depends on the presence or absence of
  the `globally` modifier to the function name. For instance, let's also comp[ute
  the global average salary:
  
  [source,sql]
  ----
  
negative.code: 
  The type for character strings is called `string`.  A literal string is double
  quoted (with +"+). To include a double-quote, backslash it.  Other characters
  can be backslashed: single quote (+"\'"+), newlines (+"\n"+ and +"\r"+),
  horizontal tab (+"\t"+), backspace (+"\b"+) and the backslash itself (+"\\"+).
  
  Some functions consider strings as UTF-8 encoded, some consider strings as mere
  sequence of bytes.
  