XML Schema Tutorial - Defining Elements and Attributes
https://www.liquid-technologies.com/xml-schema-tutorial/xsd-elements-attributes
WebXML schema (XSD) Overview. An XML schema, commonly known as an XML Schema Definition (XSD), formally describes what a given XML document can contain, in the same way that a database schema describes the data that can be contained in a database (i.e. table structure, data types, constraints etc.).
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