[Xmldatadumps-l] Question about the meaning of " ''' " mark in dumps

Hi, everyone.

I am doing a research project about wikipedia searching. I downloaded wiki dumps from this page: http://dumps.wikimedia.org/enwiki/20121001/

But I have a quick question about a symbol in the dumps. I am wondering the meaning of " ''' " in all wiki pages. For example, '''Port St. Lucie''' is a city in St. Lucie county, Florida. I thought the phrase between ''' is the title of the wiki page. But I saw, in the same page, several other phrases, like "city council" and "city Manager" are also quoted by '''. So could you help on this?

Thanks in advance.

Chong Wang