    decl pageContent(style) alias body {
        a name="top";
        include ./heading.en.yinc2;
        div id="entries"
            content;
    };

    decl page(*title, *style="", lang="en", xml:lang="en", xmlns="http://www.w3.org/1999/xhtml") alias html {
        head {
            title *title;
            meta http-equiv="Content-Type", content="text/html;charset=UTF-8";
            link rel="stylesheet", type="text/css", href="format.css";
        }

        pageContent(*style)
            content;
    };

    decl w(%term, href="https://en.wikipedia.org/wiki/%term") alias a;

    define operator "¬\s*(.*?)\s+(.*?)\s*¬" as a href="%1" > %2
    define operator "π\s*(.*?)\s+(.*?)\s*π" as a href="http://docs.python.org/py3k/library/%1" > %2
    define operator "∑([\w-]*)" as a href="https://en.wikipedia.org/wiki/%1" > %1
    define operator "∫(.*?)∫" as a href="https://en.wikipedia.org/wiki/%1" > %1
    define operator "«(.*?)»" as code > %1
    define operator "ƒ([\w-]*)" as em > %1
    define operator "◊(.*?)◊" as mark > %1