Polling with Watermarks quiz

polling.xml

<?xml version=""1.0"" encoding=""UTF-8""?>

<mule xmlns:twitter=""http://www.mulesoft.org/schema/mule/twitter""
        xmlns:tracking=""http://www.mulesoft.org/schema/mule/ee/tracking"" xmlns:dw=""http://www.mulesoft.org/schema/mule/ee/dw"" xmlns:http=""http://www.mulesoft.org/schema/mule/http"" xmlns=""http://www.mulesoft.org/schema/mule/core"" xmlns:doc=""http://www.mulesoft.org/schema/mule/documentation""
        xmlns:spring=""http://www.springframework.org/schema/beans"" 
        xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance""
        xsi:schemaLocation=""
http://www.mulesoft.org/schema/mule/twitter http://www.mulesoft.org/schema/mule/twitter/current/mule-twitter.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd"">
    <http:listener-config name=""HTTP_Listener_Configuration"" host=""0.0.0.0"" port=""8081"" doc:name=""HTTP Listener Configuration""/>
        <twitter:config name=""Twitter__Configuration"" accessKey=""<access_key>"" accessSecret=""<access_secret>"" consumerKey=""<consumer_key>"" consumerSecret=""<consumer_secret>"" doc:name=""Twitter: Configuration""/>
    
    <flow name=""championsFlow1"" processingStrategy=""queued-asynchronous"">
        <poll doc:name=""Poll"">
            <fixed-frequency-scheduler frequency=""1000""/>
            <watermark variable=""lastId-1"" default-expression=""-1"" selector=""FIRST"" selector-expression=""#[payload.id]""/>
                        <twitter:get-user-timeline-by-screen-name config-ref=""Twitter__Configuration"" screenName=""MuleSoft"" doc:name=""Twitter""/>
        </poll>
    </flow>
</mule>