Attaching the schema to the document without namespaces

• xsi:noNamespaceSchemaLocation attribute on root element

• xsi prefix is mapped to http://www.w3.org/2001/XMLSchema-instance URI

• For example,

  <?xml version="1.0"?>
  <GREETING xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="greeting.xsd">
  Hello XML!
  </GREETING>

• Other means of connecting schemas to documents are allowed