How to set xml meta tag and html meta tag

what is the differences between xml meta tag and html meta tag.
XML or XHTML Meta Tags end with />, while HTML Meta Tags end only with >.

HTML Meta Tag:

HTML Code:

"keywords" content="upin,dan,ipin,video,movie">

XML or XHTML Meta Tag:

HTML Code:

"keywords" content="upin,dan,ipin,video,movie" />

i.e. Each Meta Tag should be properly closed.

Put the meta tag between | head |