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Design Goal: Good Retrieval |
| HTML | Easy to index - hyperlinks make robots possible - not enough structure, but sometimes this is an advantage. |
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| Indexing is unreliable and depends heavily on originating application. No advanced structure search is possible. | |
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| SGML | The most advanced retrieval environments today are all SGML-based. Has it all: structure, metadata, hyperlinks. |
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| Knowledge is a text-based application. |