Multiple context Jetty, how to set different webapp directories - jetty

Question

As we dont want to have a second instance of jetty running, we chose a second named context. The context is listening ok and can connect to it on a different port fine, but we cannot seem to find out how to point the second context to a different webapps directory (to serve different content). What needs to go into the named context?.
We have tried setting resourceBase (not sure this was right approach anyway) and/or WebAppContext to other directories, usually this ends with Jetty not starting due to syntax error. There seem to be no examples in the default installation (jetty-XXXX.xml files), and there does not seem to be an example on the web or stackOverflow - so what should we put in the context definition (hopefully) to serve webapps from a different root?
jetty-http.xml config below (standard file, duplicated the addConnector and explicitly set the ports). This is Jetty 9.2.9 (cannot upgrade at present) on Centos (yes also needs an upgrade)
<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd">
<Configure id="Server" class="org.eclipse.jetty.server.Server">
<Call name="addConnector">
<Arg>
<New class="org.eclipse.jetty.server.ServerConnector">
<Arg name="server"><Ref refid="Server" /></Arg>
<Arg name="acceptors" type="int"><Property name="http.acceptors" default="-1"/></Arg>
<Arg name="selectors" type="int"><Property name="http.selectors" default="-1"/></Arg>
<Arg name="factories">
<Array type="org.eclipse.jetty.server.ConnectionFactory">
<Item>
<New class="org.eclipse.jetty.server.HttpConnectionFactory">
<Arg name="config"><Ref refid="httpConfig" /></Arg>
</New>
</Item>
</Array>
</Arg>
<Set name="host"><Property name="jetty.host" /></Set>
<Set name="port">8085</Set>
<Set name="idleTimeout"><Property name="http.timeout" default="30000"/></Set>
<Set name="soLingerTime"><Property name="http.soLingerTime" default="-1"/></Set>
<Set name="acceptorPriorityDelta"><Property name="http.acceptorPriorityDelta" default="0"/></Set>
<Set name="selectorPriorityDelta"><Property name="http.selectorPriorityDelta" default="0"/></Set>
<Set name="acceptQueueSize"><Property name="http.acceptQueueSize" default="0"/></Set>
</New>
</Arg>
</Call>
<Call name="addConnector">
<Arg>
<New class="org.eclipse.jetty.server.ServerConnector">
<Arg name="server"><Ref refid="Server" /></Arg>
<Arg name="acceptors" type="int"><Property name="http.acceptors" default="-1"/></Arg>
<Arg name="selectors" type="int"><Property name="http.selectors" default="-1"/></Arg>
<Arg name="factories">
<Array type="org.eclipse.jetty.server.ConnectionFactory">
<Item>
<New class="org.eclipse.jetty.server.HttpConnectionFactory">
<Arg name="config"><Ref refid="httpConfig" /></Arg>
</New>
</Item>
</Array>
</Arg>
<Set name="host"><Property name="jetty.host" /></Set>
<Set name="port">8095</Set>
<Set name="idleTimeout"><Property name="http.timeout" default="30000"/></Set>
<Set name="soLingerTime"><Property name="http.soLingerTime" default="-1"/></Set>
<Set name="acceptorPriorityDelta"><Property name="http.acceptorPriorityDelta" default="0"/></Set>
<Set name="selectorPriorityDelta"><Property name="http.selectorPriorityDelta" default="0"/></Set>
<Set name="acceptQueueSize"><Property name="http.acceptQueueSize" default="0"/></Set>
<!--- this does not work...
<Set name="handler">
<New class="org.mortbay.jetty.handler.HandlerList">
<Set name="handlers">
<Array type="org.mortbay.jetty.Handler">
<Item>
<New class="org.mortbay.jetty.handler.DefaultHandler" />
</Item>
<Item>
<New class="org.mortbay.jetty.handler.ResourceHandler">
<Set name="resourceBase">/opt/jetty/webapp2</Set>
</New>
</Item>
</Array>
</Set>
</New>
</Set>
--->
</New>
</Arg>
</Call>
</Configure>