<foo xmlns=“FOO”
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://FOO derivation-ok-extension_0.xsd" barA_1="o" barA_2="o"/>
<foo xmlns=“FOO”
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://FOO derivation-ok-extension_0.xsd" barA_1="o" barA_2="o"/>