CALC: Difference between "Save as Document HTML" and "Export to XHTML"?

[Wagner Macedo]

Hello, I'm beginning as sporadic volunteer (for now) to the LO development.

Saying this, I visited
https://bugs.freedesktop.org/show_bug.cgi?id=41281, marked as
ProposedEasyHack and I asked (since I don't know if I should ask here
or there, I'm asking here too):

> What is the supposed difference between "Save as Document HTML (Calc)" and "Export to XHTML"?
> At my tests using LibreOffice 4.1, I still confirm the bug, using the former. But in the latter way, it is working.

--
Wagner Macedo