Background

2.1 Background

A stream model for XML parsers—the parser sees a sequence of tokens
An event is declared when a token is encountered
A code segment, called the event handler, is executed when an event occurs
A program consists of handlers registered with a parser
SAX is an interface supporting this approach

|----------program--|
| event handlers |
| |-| || |-| |-| |
-||||- | ------| ----|- |
-XML --| --|-||-- |
|file-- -- --|-parser| |
-------------------

<course>
  <number>CIS 788</number>
  <quarter>Autumn</quarter>
  <days>
     <day>Monday</day>
     <day>Wednesday</day>
     <day>Friday</day>
  </days>
  <note font="big" sound=’loud’>Welcome
       and hope you’ll enjoy it.</note>
</course>

Parser: raise an event on <course>
Event handler: handle the event due to <course>
Parser: raise an event on <number>
Event handler: handle the event due to <number>
Parser: raise an event on CIS 788
Event handler: handle the event due to CIS 788
Parser: raise an event on </number>
Event handler: handle the event due to </number>
...

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