<span lang="en"> ==> <lang="en">

Why don't we  add the <lang="en"> element in addition to <span lang="en">
(now <lang> is an attribute)?
It will make the xhtml docs smaller.

examples:
[xhtml now]     <span lang="it">BuioOmega</span> is a rockband
[my proposal]   <lang="it">BuioOmega</span> is a rockband

[xhtml now]     <span class="artist" lang="it">BuioOmega</span>
[my proposal]   in this case it can be written both
                <span class="artist" lang="it">BuioOmega</span> the same]
and
                <span class="artist"><lang="it">BuioOmega</lang></span>

What do you think?

Thank you for your attention :)