v1/test/src/schemas/defaults.xsd

<xs:schema
   xmlns:xs="http://www.w3.org/2001/XMLSchema"
   xmlns:tns="http://openuri.org/def"
   targetNamespace="http://openuri.org/def"
   elementFormDefault="qualified">

  <xs:element name="defaults">
    <xs:complexType>
      <xs:sequence>
      </xs:sequence>
      <xs:attribute ref="tns:cool"/>
    </xs:complexType>
  </xs:element>

  <xs:attribute name="cool" type="xs:int" default="783"/>

</xs:schema>