About XML declaration

For example like this

<beans xmlns="http://ift.tt/GArMu6"
    xmlns:context="http://ift.tt/GArMu7"
    xmlns:xsi="http://ift.tt/ra1lAU"
    xsi:schemaLocation="
    http://ift.tt/GArMu6          
    http://ift.tt/QEDs1e
    http://ift.tt/GArMu7 
    http://ift.tt/QEDs1k">

    <context:component-scan base-package="com.tutorialspoint" />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/" />
            <property name="suffix" value=".jsp" />
    </bean>

</beans>

Here is http://ift.tt/QEDs1e http://ift.tt/QEDs1k

I want to know when this xsd file downloaded

If my computer is not connected to internet I thought my computer can't read this xml file. because my computer can't download xsd file

but my computer diplay this xml file why?

what is xsd for?

My English so... not good. sorry.