Index: openacs-4/packages/acs-core-docs/www/db-api.html
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-core-docs/www/db-api.html,v
diff -u -r1.53 -r1.54
--- openacs-4/packages/acs-core-docs/www/db-api.html	25 Apr 2018 08:38:27 -0000	1.53
+++ openacs-4/packages/acs-core-docs/www/db-api.html	12 Feb 2019 17:12:18 -0000	1.54
@@ -339,27 +339,6 @@
 # numeric column "bar") into null in both cases
 
       </pre>
-
-      <p>
-	Since databases other than Oracle do not coerce empty strings into
-	<code class="computeroutput">null</code>, this code has different semantics depending on the
-	underlying database (i.e., the row that gets inserted may not have null as
-	its column values), which defeats the purpose of SQL abstraction. 
-      </p>
-
-      <p>Therefore, the Database Access API provides a database-independent way to
-	represent <code class="computeroutput">null</code> (instead of the Oracle-specific idiom of the
-	empty string): <code class="computeroutput">db_null</code>.</p>
-
-      <p>Use it instead of the empty string whenever you want to set a column value
-	explicitly to <code class="computeroutput">null</code>, e.g.:</p>
-
-      <pre class="programlisting">set bar [db_null]
-set baz [db_null]
-
-db_dml foo_create "insert into foo(bar, baz) values(:bar, :baz)"
-#
-# sets the values for both the "bar" and "baz" columns to null</pre>
     </div>
     
   </div>
@@ -545,25 +524,6 @@
           <p>Technically it's equivalent to using a code block on
           the end of your db_multirow.</p>
 
-  	</dd><dt><span class="term">
-	  
-	    <code class="computeroutput">
-	      <a name="devguide.dbapi_db_null"></a>db_null
-	    </code>
-	  
-
-	</span></dt><dd>
-	  <pre class="programlisting">
-<code class="computeroutput">db_null</code>
-	  </pre>
-
-	  <p>
-	    Returns a value which can be used in a bind variable
-	    to represent the SQL value
-	    <code class="computeroutput">null</code>.
-	    See <a class="link" href="db-api.html#dbapi_nulls_and_bind_vars" title="Nulls and Bind Variables">Nulls and
-	    Bind Variables</a> above.
-	  </p>
 	</dd><dt><span class="term">
 	  
 	    <code class="computeroutput">