How Wikipedia convert wikitext of infobox to display on web page?
For example, Barack Obama's wiki, when View source, we can see {{Infobox officeholder template, and below is snippet of this infobox
|birth_name = Barack Hussein Obama II
|birth_date = {{birth date and age|mf=yes|1961|8|4}}
|birth_place = [[Honolulu]], [[Hawaii]], U.S.
|nationality = American
|party = [[Democratic Party (United States)|Democratic]]
What I'm interesting is that how Wikipedia display nationality as Nationality on web page
also party as Political party
birth_name, birth_date, birth_place as Born
It is made through the template Infobox officeholder. If you look at the source, you can see how the code is constructed.