Adding more information

diff --git a/documentation/zil.md b/documentation/zil.md
index c2caf8f94844b82e7fc35b106ecad0b825c1ba20..4d30b87d24c9b04d1a1b512a501c68d20b42e1fe 100644 (file)
--- a/documentation/zil.md
+++ b/documentation/zil.md
@@ -1,6 +1,9 @@
-# Zork Implentation Language
-This document covers the Zork Implementation Language, as originally 
-developed and used by Infocom for their games.
+# Introduction
+This document covers the Zork Implementation Language, or ZIL for 
+short, as originally developed and used by Infocom for their games.
+
+ZIL is a subset of the MIT Design Language, or MDL for short, and 
+pronounced as "Muddle". MDL is itself based on classic LISP.
 
 ## Format
 This document is written using CommonMark, a markup language. More 
@@ -17,7 +20,6 @@ License along with this document. If not see
 <https://gnu.org/licenses/>.
 
 ## Definitions
-
 A "definition" is used to describe a room, object, routine, etc. in or 
 used by the game. Each definition consists of a number of properties, 
 flags, and/or instructions. A program written in ZIL can be thought of 
@@ -25,9 +27,39 @@ as consisting of one or more of these definitions. Definitions,
 properties, flags, and instructions include brackets which must be 
 correctly paired and nested.
 
+## Comments
+Comments are ignored by the compiler. A comment begins with a 
+semicolon (;) and continues until the end of the line. A multiline 
+comment also begins with a semicolon but is enclosed in double 
+quotes. However, single line comments may also be enclosed in double 
+quotes. While comments may be placed anywhere in a source code file, a 
+comment may not be placed inside an atom.
+
+## Parser
+The purpose of the parser is to receive and process the player's 
+input. Its primary responsibility is to determine the player's 
+intended action along with any objects that may be referred to.
+
+The player's action is referred to internally as the PRSA (think "A" 
+for action like "EAT", the direct object as PRSO (think "O" for 
+"object") and the indirect object as PRSI (think "I" for indirect.)
+
+For an example, the command "KILL TROLL WITH SWORD" would set the PRSA 
+to KILL and the PRSO to TROLL and PRSI to SWORD. It is important to 
+note that not all instructions from the player will necessarily have 
+all three things, but a PRSA is required in all cases and you can't 
+have a PRSI without also having a PRSO. In cases where there is no 
+PRSI or PRSO, they are set to false.
+
+Note that the PRSA isn't simply the word that the player entered. The 
+PRSA from a given sentence is determined by the syntax definitions in 
+the game. An example being: The player might type "CONSUME APPLE" but 
+in the game's syntax definitions, the PRSA associated with "consume" 
+might be EAT.
+
 ## Syntax Definitions
 Syntax definitions are used by the parser to determine valid sentence 
-structures.
+structures. Each entry must correspond to this format:
 
 A simple example might be:
 
@@ -36,3 +68,5 @@ A simple example might be:
 Using this example, should the parser match the player's input to 
 "xyzzy" then the PRSA is set to magic. PRSI and PRSO would be set to 
 false.
+
+## Syntax Tokens