Cannot determine how this code works on the Framework

I'm not sure how this code works on the Framework. thank you. New to the company, & nbsp; on Framework & nbsp; MVC & nbsp;, I saw the following code. I don't know if it is php or how it works. please ask. Page.header.html & lt ;! DOCTYPE & nbsp; html & nbsp; PUBLIC & nbsp;-W3CDTD & nbsp; XH cannot determine how this code works on the Framework
Thank you.

New to the company, I saw the following code on Framework MVC. I don't know if it is php or how it works. please ask.


Page.header.html

{C::$DOMAIN} - {$config.title}