Add a few items to the reserved keyword lists.

Clarify information on implicitly-typed constants.

doc/src/sgml/syntax.sgml

@@ -181,12 +181,13 @@ ALLOCATE ARE ASSERTION AT AUTHORIZATION AVG
 BIT BIT_LENGTH
 CASCADED CATALOG COLLATION CONNECT CONNECTION
  CONSTRAINTS CONTINUE CONVERT CORRESPONDING COUNT
-DATE DEALLOCATE DEC DESCRIBE DESCRIPTOR DIAGNOSTICS DISCONNECT DOMAIN 
+DATE DEALLOCATE DEC DEFERRABLE DEFERRED DESCRIBE DESCRIPTOR
+ DIAGNOSTICS DISCONNECT DOMAIN 
 END-EXEC ESCAPE EXCEPT EXCEPTION EXEC EXTERNAL 
 FIRST FOUND
 GET GO GOTO 
-IDENTITY IMMEDIATE INDICATOR INITIALLY INPUT INTERSECT ISOLATION 
-LAST LEVEL LOWER 
+IDENTITY IMMEDIATE INDICATOR INITIALLY INPUT INTERSECT
+LAST LOWER 
 MAX MIN MODULE 
 OCTET_LENGTH OPEN OUTPUT OVERLAPS 
 PREPARE PRESERVE 
@@ -250,9 +251,9 @@ VALID VERSION
 ABSOLUTE ACTION
 DAY
 HOUR
-INSENSITIVE 
+INSENSITIVE ISOLATION 
 KEY 
-LANGUAGE 
+LANGUAGE LEVEL 
 MATCH MINUTE MONTH
 NEXT 
 OF ONLY OPTION 
@@ -283,22 +284,21 @@ COMMITTED SERIALIZABLE TYPE
      <programlisting>
 ADA
 C CATALOG_NAME CHARACTER_SET_CATALOG CHARACTER_SET_NAME 
-CHARACTER_SET_SCHEMA CLASS_ORIGIN COBOL COLLATION_CATALOG
-COLLATION_NAME COLLATION_SCHEMA COLUMN_NAME
-COMMAND_FUNCTION CONDITION_NUMBER
-CONNECTION_NAME CONSTRAINT_CATALOG CONSTRAINT_NAME
-CONSTRAINT_SCHEMA CURSOR_NAME
+ CHARACTER_SET_SCHEMA CLASS_ORIGIN COBOL COLLATION_CATALOG
+ COLLATION_NAME COLLATION_SCHEMA COLUMN_NAME
+ COMMAND_FUNCTION CONDITION_NUMBER
+ CONNECTION_NAME CONSTRAINT_CATALOG CONSTRAINT_NAME
+ CONSTRAINT_SCHEMA CURSOR_NAME
 DATA DATE_TIME_INTERVAL_CODE DATE_TIME_INTERVAL_PRECISION
-DYNAMIC_FUNCTION
+ DYNAMIC_FUNCTION
 FORTRAN
 LENGTH
 MESSAGE_LENGTH MESSAGE_OCTET_LENGTH MORE MUMPS
 NAME NULLABLE NUMBER
 PAD PASCAL PLI
 REPEATABLE RETURNED_LENGTH RETURNED_OCTET_LENGTH
-RETURNED_SQLSTATE ROW_COUNT
-SCALE SCHEMA_NAME SERVER_NAME SPACE
-SUBCLASS_ORIGIN
+ RETURNED_SQLSTATE ROW_COUNT
+SCALE SCHEMA_NAME SERVER_NAME SPACE SUBCLASS_ORIGIN
 TABLE_NAME
 UNCOMMITTED UNNAMED
      </programlisting>
@@ -354,9 +354,13 @@ We also support C-style block comments, e.g.:
    <title>Constants</title>
 
    <para>
-    There are six types of
-    <firstterm>constants</firstterm>
-    for use in SQL.  They are described below.
+    There are three <firstterm>implicitly typed constants</firstterm>
+    for use in <productname>Postgres</productname>: strings, integers, 
+    and floating point numbers.  Constants can
+    also be specified with explicit types, which can enable more
+    accurate representation and more efficient handling by the
+    backend. The implicit constants are described below; explicit
+    constants are discussed afterwards.
    </para>
 
    <sect2>
@@ -445,7 +449,7 @@ float4 '1.23'  -- string style
     <para>
      A constant of an
      <emphasis>arbitrary</emphasis>
-     type can be entered using the notations:
+     type can be entered using any one of the following notations:
 
      <synopsis>
 <replaceable>type</replaceable> '<replaceable>string</replaceable>'