| Technical
challenges (2) |
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| Dynamic nature of
Web: |
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| – | Web pages
disappear on average after 75 |
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| days |
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| – | Many leave no
trace |
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| Evolution of
Web-based technologies: |
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| – | Increasing
reliance on databases, scripts, |
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| plug-ins, etc. |
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| – | A 'moving target' |
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