What kind of template engine uses double underscore enclosure?

Question

I was asked to continue & modify a CMS project which seems to be custom made. Taken from one of the files is the code below:

<!-- BEGINACCESS_DATA=LoginData -->
<ul id="topleftlogin" class="sf-menu">
    <li><a href="__linklogin__">Sign In</a></li>
</ul>
<!-- ENDACCESS_DATA -->
<!-- BEGINACCESS_DATA=LogoutData -->
<ul id="topleftlogin" class="sf-menu">
    <li><a href="#">Hai, __myname__</a></li>
    <li>__panel__</li>
    <li>__logout__</li>
</ul>
<!-- ENDACCESS_DATA -->

The above came from an HTML file (form_view.html).

My question is:

• Are the ones enclosed in double underscores (eg. __myname__) some kind of variables?
• Where do they get their values from?
• What kind of template engine uses such format?

I had searched through out the rest of the files but couldn't find the connection between those 'variables' and the data they retrieve. What should I look for??

Answer 1

I guess some php (regex) script is parsing code between

  < !-- BEGINACCESS_DATA--> and < !-- ENDACCESS_DATA -->

and replacing tokens like __ % __

Look in php source and in .htaccess