<foobar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNameSpaceSchemaLocation="my-schema.xsd" > ... </foobar>
<foobar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:SchemaLocation="http://my-namespace.org/ my-schema.xsd" xmlns="http://my-namespace.org/" > ... </foobar>
<xs:schema targetNamespace="http://my-namespace.org/" xmlns:adr="http://my-namespace.org/" > ... </xs:schema>