What are XML and XSD schemas? Why do we create XSD schemas?

XML (eXtensible Markup Language) — is a text format for storing and transmitting structured data. It uses tags to describe elements and their hierarchy, similar to HTML, but is designed for data exchange between systems.

XSD (XML Schema Definition) — is a schema that describes the structure, data types, and constraints for an XML document. It sets the rules that an XML must follow to be valid.

Why XSD schema is needed:

• Validation of the correctness of an XML document according to specified rules.
• Defining data types of elements and attributes (e.g., number, date, string).
• Ensuring data consistency between different systems.
• Automatic generation of code and documentation based on the schema.

Example: if you have an XML with order information, XSD helps ensure that each order contains the necessary fields, such as order number, date, and amount, and that they have the correct format.