XML highlight group?

[Ploppz]

The MatchTag highlight group works for HTML, but doesn't seem to apply to XML. What highlight group do I need to set the colour of for XML tag matching?

.vimrc

let g:mta_use_matchparen_group = 0
let g:mta_set_default_matchtag_color = 1

In colour scheme:

hi MatchTag ctermfg=11 ctermbg=16 cterm=underline

^ Doesn't apply to XML - it gives some bright blue background while backgruond 16 is dark brown.