Is xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” a special case in XML?

There are four built in declarations for Xml schemata type nil schemaLocation and noNamespaceSchemaLocation as are "present in every schema by definition." You can read about them in the Xml Schema recommendation .

There's no requirement to say where the schema is located. You can do it if you want, but you don't have to.

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