Newbie Alert: How can I include a JSF in a JSF

Sorry for what must be a really stupidly easy question but I have tried every way I can think to get one JSF page to include another JSF page. For instance I want to include a standard site wide header. I am using jspx and have tried
<f:subview id="header">
    <jsp:include page="header.jsf"/>
</f:subview>and
<f:subview id="header">
    <c:import url="header.jspx"/>
</f:subview>and every variation you can imagine (both .jsf and .jspx extentions, with and without a rendered property on the subview, including everything in the included page in f:verbatim and a million other things). My header page is as simple as <?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="2.0"
     xmlns:jsp="http://java.sun.com/JSP/Page"
     xmlns:c="http://java.sun.com/jsp/jstl/core"
     xmlns:f="http://java.sun.com/jsf/core"
     xmlns:h="http://java.sun.com/jsf/html">
     <f:view>
          <f:verbatim>
<p>this is a header</p>
          </f:verbatim>
     </f:view>
</jsp:root>All the questions I have found seem to indicate that the above should work but I just get
javax.faces.FacesException: Assertion Failed
     at com.sun.faces.util.Util.doAssert(Util.java:1302)
     at com.sun.faces.taglib.jsf_core.ViewTag.getComponentType(ViewTag.java:241)
     at javax.faces.webapp.UIComponentTag.createComponent(UIComponentTag.java:1013)
     at javax.faces.webapp.UIComponentTag.createChild(UIComponentTag.java:1036)
     at javax.faces.webapp.UIComponentTag.findComponent(UIComponentTag.java:749)
     at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:429)
     at com.sun.faces.taglib.jsf_core.ViewTag.doStartTag(ViewTag.java:105)
     at org.apache.jsp.header_005f1_jspx._jspx_meth_f_view_0(header_005f1_jspx.java:77)
     at org.apache.jsp.header_005f1_jspx._jspService(header_005f1_jspx.java:55)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)and various other errors along the same lines.
Can someone please give me some pointers. A working example would be nice :o)
Many Thanks

Many thanks. I still can't seem to get it to work though. I must be missing something really obvious. Could you have a quick look over these pages and tell me if anything is wrong.
The including page (called page.jspx):
<?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="2.0"
     xmlns:jsp="http://java.sun.com/JSP/Page"
     xmlns:c="http://java.sun.com/jsp/jstl/core"
     xmlns:f="http://java.sun.com/jsf/core"
     xmlns:h="http://java.sun.com/jsf/html">
     <jsp:directive.page contentType="text/html"/>
     <f:view>
          <f:loadBundle basename="localization.messages" var="text"/>
          <f:verbatim>
               <![CDATA[<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3c.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">]]>
          </f:verbatim>
          <html xmlns="http://www.w3.org/1999/xhtml">
               <head>
                    <title>Example</title>
               </head>
               <body>
                    <jsp:include page="simple_header.jsf"/>
               </body>
          </html>
     </f:view>
</jsp:root>the included page called simple_header.jspx
<?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="2.0"
     xmlns:jsp="http://java.sun.com/JSP/Page"
     xmlns:c="http://java.sun.com/jsp/jstl/core"
     xmlns:f="http://java.sun.com/jsf/core"
     xmlns:h="http://java.sun.com/jsf/html">
     <f:subview id="header">
          <f:verbatim>
               <p>Bar</p>
          </f:verbatim>
     </f:subview>
</jsp:root>and finally the error message
java.io.IOException: Stream closed
     org.apache.jasper.runtime.BodyContentImpl.ensureOpen(BodyContentImpl.java:576)
     org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:140)
     org.apache.jasper.runtime.BodyContentImpl.write(BodyContentImpl.java:157)
     org.apache.jsp.page_jspx._jspx_meth_f_view_0(page_jspx.java:102)
     org.apache.jsp.page_jspx._jspService(page_jspx.java:58)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
     com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
     com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
     com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
     com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
     com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
blah blah blah...

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