test/schemas/issue303_0.xsd

<?xml version="1.0"?>
<xs:schema id="foo" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="inner">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="a" type="xs:double" minOccurs="1" />
        <xs:element name="b" type="xs:double" minOccurs="1" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="outer">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="inner" minOccurs="0" maxOccurs="unbounded" />
        <xs:element name="c" type="xs:double" minOccurs="1" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>