XML 目XML= Extensible Markup Language. While HTML uses tags for formatting (e.g.,"italic"),XML uses tags for semantics (e.g.,"this is an address"). Key idea:create tag sets for a domain,and translate all data into properly tagged XML documents.4 XML † XML = Extensible Markup Language. † While HTML uses tags for formatting (e.g., “italic”), XML uses tags for semantics (e.g., “this is an address”). † Key idea: create tag sets for a domain, and translate all data into properly tagged XML documents