hmm, I'll be needing this to make the previous checkin actually work

include/XSLT/impl/xslt_stylesheet.hpp

@@ -0,0 +1,34 @@
+#ifndef ARABICA_XSLT_STYLESHEET_HPP
+#define ARABICA_XSLT_STYLESHEET_HPP
+
+namespace Arabica
+{
+namespace XSLT
+{
+
+#include <string>
+#include <iostream>
+#include <DOM/Node.hpp>
+class Sink;
+
+class Stylesheet
+{
+public:
+  virtual ~Stylesheet() { }
+
+  virtual void set_parameter(const std::string& name, bool value) = 0;
+  virtual void set_parameter(const std::string& name, double value) = 0;
+  virtual void set_parameter(const std::string& name, const char* value) = 0;
+  virtual void set_parameter(const std::string& name, const std::string& value) = 0;
+
+  virtual void set_output(Sink& sink) = 0;
+
+  virtual void set_error_output(std::ostream& os) = 0;
+
+  virtual void execute(const DOM::Node<std::string>& initialNode) const = 0;
+}; // class Stylesheet
+
+} // namespace XSLT
+} // namespace Arabica
+
+#endif