sesklo.server is a WSGI app used to serve up content generated by an Inkscape extension called sesklo.inkscape although it may be of some use on it's own. It uses a base Tempita template "templates/base.tmpl" and when a url is requested it looks for files in the corresponding directory to generate the page. The content from any ".html" files whose names match the id of an element in is placed inside that element before rendering. It also includes any ".css" or ".js" files in the header.