NO
The current JMS Multisites definition are:
- If a URL correspond to a slave site domain defined in JMS multisites then this is a slave site
- Otherwise, this is the master (the default).
For your information, the www website can also be a slave site.
If you read our recommendation, in general we present master.domain.com as the master website.
After that the
www.domain.com can be defined as a slave site.
Therefore the rule to say that www is the master website is wrong and in general is not recommended.
Perhaps you could review the tutorial video 0.b slide 21-24
www.jms2win.com/tutorial#jms12x-0b