Summary
HTML and other markup languages arose in response to the need for accurate ways to present and transmit data electronically. Born in a nuclear laboratory, the tags that define the World Wide Web have helped remake the world of data exchange.
In some ways, XML is more restrictive than HTML in how tags can be used to organize information, and those differences were described in this hour. Simple examples of XML files were presented, as well as the hierarchical trees that can be used to describe the data.
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