[m2] Activating profiles

[Wendy Smoak]

Given this profile in settings.xml

      <profile>
         <id>env-local</id>
         <activation>
            <property>
               <name>env</name>
               <value>local</value>
            </property>
         </activation>
        ...
       <profile>

Is there any reason that using -P env-local would work, while -Denv=local
would not?  (Maven 2.0.2)

Here's the output of mvn projecthelp:active-profiles:
   http://wiki.wsmoak.net/cgi-bin/wiki.pl?Maven/ProjectHelp

I'm working from this:
http://maven.apache.org/guides/introduction/introduction-to-profiles.html

Thanks,
Wendy