Our layout would be
<pre>
/var/www
??? clients? ??? example.com? ??? wiki.example.com? ??? w -> /var/www/_MW/mediawiki??? html??? _MW ??? mediawiki -> /var/www/_MW/mediawiki-REL1_27 ??? mediawiki-REL1_27 ??? cache ??? docs ??? extensions ??? images ??? includes ??? languages ??? maintenance ??? mw-config ??? resources ??? serialized ??? skins ??? tests ??? vendor ??? WikiFarm
</pre>