Orange Servlet provides HTML templating with server-side Java. OrangeServlet is a servlet that is registered on *.html. It reads the html file at the right location according to URL. It renders the file as html, executing some scripting: * data-if="E" attributes for server-side conditional, * data-for="T x : E" attributes for server-side loops, * data-import="C" attributes for server-side class imports, * data-substitute="file.html" substitute an element with the processed contents of a file, * ${expressions} in element bodies and attribute values.