The W3C XML Schema-Related Namespaces

The W3C defines two specific namespaces associated with the XML Schema language.

  • http://www.w3.org/2001/XMLSchema: This namespace defines all the constructs specified by the Schema Recommendation, including all the Element and Attribute names we use in schemas. By convention this namespace is referred to by the prefix xs, though you may occasionally see xsd.

  • http://www.w3.org/2001/XMLSchema-instance: This namespace defines Attributes that can be used in XML instance documents. We have seen two so far, noNamespaceSchemaLocation and schemaLocation. By convention this namespace is referred to by the prefix xsi.

The former is used in every schema document written in the W3C XML Schema language, so it is very ...

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