When the earlier search engines used lists to extract information needed for providing results to queries, Google is trying to extract the information from tables.
Google is trying to take the information from tables where meaningful data is contained. They will take the data from the tables and will create a separate database for them and will try to relate the data in different tables to each other. They will later allow people to search through these data.
All this is possible because of the peculiar structure of the tables. The tables have columns and there are labels for these columns. This will help Google to extract the information with the corresponding label and will store it in a database. This data stored in the database can be used to help searchers in the later.
The pages in websites can have structured as well as unstructured data. The unstructured information will not be in the form of tables with labels and hence wont have values for the labels. On the other hand, the structured data will be more organized.
Google is researching on how to extract the data from the HTML tables and later on how to use this information for searching using keywords.
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