+HtmlStream & operator<<(HtmlStream & ms, MathData const & ar)
+{
+ htmlize(ar, ms);
+ return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, char const * s)
+{
+ ms.os() << s;
+ return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, char c)
+{
+ ms.os() << c;
+ return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, char_type c)
+{
+ ms.os().put(c);
+ return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, MTag const & t)
+{
+ ms.os() << '<' << from_ascii(t.tag_);
+ if (!t.attr_.empty())
+ ms.os() << " " << from_ascii(t.attr_);
+ ms << '>';
+ return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, ETag const & t)
+{
+ ms.os() << "</" << from_ascii(t.tag_) << '>';
+ return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, docstring const & s)
+{
+ ms.os() << s;
+ return ms;
+}
+
+
+//////////////////////////////////////////////////////////////////////
+
+
+SetMode::SetMode(MathStream & os, bool text)
+ : os_(os)