How to append to an existing file with WSO2 ESB (VFS)

Question

I'm writing to a single file with a WSO2 ESB using a VFS endpoint. But this does override the file each time. How can I configure the endpoint to append the content? Or does this feature even exist?

<inSequence>
    <log level="full"/>type="STRING"/>
    <property name="transport.vfs.ReplyFileName" expression="myOutputFile.txt" scope="transport" type="STRING"/>
    <send>
        <endpoint>
            <address uri="vfs:file://C:/MyOutputDirectory"/>
        </endpoint>
    </send>
</inSequence>

(my content is text/plain)

Answer 1

In order to append to the same file, define the transport.vfs.Append=true parameter with the file address URI[1]

<address uri="vfs:file://C:/MyOutputDirectory?transport.vfs.Append=true"/>

[1]http://docs.wso2.org/wiki/display/ESB450/VFS+Transport