Concatenate string in spring xml configuration

I need to concatenate the string value of a spring bean, to an existing string, and then set it as an attribute of another bean:

<bean id="inet" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetClass"><value>java.net.InetAddress</value></property>
    <property name="targetMethod"><value>getLocalHost</value></property>
</bean>
<bean id="host" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject"><ref local="inet"/></property>
    <property name="targetMethod"><value>getHostName</value></property>
</bean>

At this point, I have the hostname, in the 'host' bean. I now need to concatenate it and pass it to the publishedEndpointUrl attribute. Something like this:

<jaxws:endpoint 
    id="foo"
    publishedEndpointUrl= "http://" + host + "/Foo" 
    implementor="com.example.v1.foo"
    address="/v1/Foo"/>

How is this done using spring xml configuration?