Namespaces

Suppose that instead of the simple custom vocabulary I've been using so far, you wanted to use the standard MathML presentation vocabulary, as shown in Example 14.4.

Example 14.4. A MathML Document Containing the First Three Fibonacci Numbers
<?xml version="1.0"?>
<mathml:math xmlns:mathml="http://www.w3.org/1998/Math/MathML">
  <mathml:mrow>
    <mathml:mi>f(1)</mathml:mi>
    <mathml:mo>=</mathml:mo>
    <mathml:mn>1</mathml:mn>
  </mathml:mrow>
  <mathml:mrow>
    <mathml:mi>f(2)</mathml:mi>
    <mathml:mo>=</mathml:mo>
    <mathml:mn>1</mathml:mn>
  </mathml:mrow>
  <mathml:mrow>
    <mathml:mi>f(3)</mathml:mi>
    <mathml:mo>=</mathml:mo>
    <mathml:mn>2</mathml:mn>
  </mathml:mrow>
</mathml:math>

The greatest difference from the previous examples is that MathML uses namespaces ...

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