Unit 1: Muddiest Points

When I studied an overview of IR, some questions were camp up:

1. If html information is belong to unstructured information, are XML and Json format also belong to unstructured information?
2. How should people ensure that users assess the right information to the IR system? Since some people would give the wrong feedback on the system.
3. Sometimes developers would store unstructured data on the database and create the index on the table. Is that a  unstructured or structured information?

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