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Our XML-based language

• Consists of the elements: <recipe>, <title>, <ingred>, <num>, <unit>, ...
• Implicitly sets rules of containment and ordering on the elements

<recipe> 
  <title>Mulled Cider</title> 
  <ingred><num>6</num> 
          <unit>cups<unit> 
          <type>cider</type> 
  </ingred> 
   .......  
  <do minutes="30">simmer for <time/></do> 
  <srv><num>12</num> 
       <num>150</num> </srv> 
</recipe>