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1 XML can keep data separated from your HTML. 2  XML can be used to store data inside HTML documents. 3  XML can be used as a format to exchange information. 4  XML can be used to store data in files or in databases.
Don't let the term schema intimidate you. A schema is just an XML file that contains the rules for what can and cannot reside in an XML data file. Schema files typically use the .xsd file name extension, while XML data files use the .xml extension.Schemas allow programs to validate data.on't let the term schema intimidate you. A schema is just an XML file that contains the rules for what can and cannot reside in an XML data file. Schema files typically use the .xsd file name extension, while XML data files use the .xml extension.