<xsd:complexType name="IndexAnnexSource"> <xsd:simpleContent> <xsd:extension base="Scheme"> <xsd:attribute name="indexAnnexSourceScheme" default="http://www.fpml.org/coding-scheme/cdx-index-annex-source" type="xsd:anyURI" /> </xsd:extension> </xsd:simpleContent> </xsd:complexType>