This seems to describe the relation of Ant and NAnt better.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271147 13f79535-47bb-0310-9956-ffa450edef68

docs/projects.html

@@ -343,7 +343,7 @@
                       <td bgcolor="#a0ddf0" colspan="" rowspan="" 
       valign="top" align="left">
     <font color="#000000" size="-1" face="arial,helvetica,sanserif">
-          not compatible to Ant at all.
+          compatible in spirit.
         </font>
   </td>
       </tr>

xdocs/projects.xml

@@ -111,7 +111,7 @@
         <table>
           <tr>
             <th>Compatibility:</th>
-            <td>not compatible to Ant at all.</td>
+            <td>compatible in spirit.</td>
           </tr>
           <tr>
             <th>URL:</th>