SVG: un linguaggio grafico(2)

<?xml version="1.0"?>
<?xml-stylesheet href="svg-style.css" type="text/css"?>
<svg width="6in" height="4.5in" viewBox="0 0 600 450"
  xmlns="http://www.w3.org/2000/svg-20000802">
 <metadata>
    <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
      xmlns:connect="http://www.w3.org/1999/08/29-svg-connections-in-RDF">
      <rdf:Description about="#CableN">
        <connect:ends rdf:resource="#socket5"/>
        <connect:ends>Everything</connect:ends>
      </rdf:Description>
      <rdf:Description about="#CableA">
        <connect:ends rdf:resource="#socket1"/>
        <connect:ends rdf:resource="#ComputerA"/>
      </rdf:Description>
      <rdf:Description about="#CableB">
        <connect:ends rdf:resource="#socket2"/>
        <connect:ends rdf:resource="#ComputerB"/>
      </rdf:Description>
      <rdf:Description about="#hub">
        <connect:ends rdf:resource="#socket1"/>
        <connect:ends rdf:resource="#socket2"/>
        <connect:ends rdf:resource="#socket3"/>
        <connect:ends rdf:resource="#socket4"/>
        <connect:ends rdf:resource="#socket5"/>
      </rdf:Description>
    </rdf:RDF>
  </metadata>
  <title id="mainTitle">Network
  <desc>An example of a computer network based on a hub
<!-- Draw text. -->
  <text x="0" y="-10">
    <tref xlink:href="#mainTitle"/>
  </text>
<!-- Use the hub image and its title and description information. -->
  <g id="hub" transform="translate(180 200)">
    <image width="600" height="450" xlink:href="hub.svg"/>
  </g>
  <!-- Use an external computer symbol. Scale to fit. -->
  <g id="ComputerA" transform="translate(20 170)">
    <title>Computer A</title>
    <use xlink:href="computer.svg#terminal" transform="scale(0.5)"/>
  </g>
<!-- And so on to add the rest of the network... -->
</svg>