assertEquals( "x", ( (XmlElementDefinition) rectangleNestedContent.get( 0 ) ).getName().getLocalPart() );
assertEquals( "y", ( (XmlElementDefinition) rectangleNestedContent.get( 1 ) ).getName().getLocalPart() );
assertEquals( "width", ( (XmlElementDefinition) rectangleNestedContent.get( 2 ) ).getName().getLocalPart() );
assertEquals( "height", ( (XmlElementDefinition) rectangleNestedContent.get( 3 ) ).getName().getLocalPart() );
final XmlContentModel foundCircleContentModel = workbookContentModel.findChildElementContentModel( new QName( NAMESPACE, "circle" ) );
assertNotNull( foundCircleContentModel );
final XmlContentModel foundRectangleContentModel = workbookContentModel.findChildElementContentModel( new QName( NAMESPACE, "rectangle" ) );
assertNotNull( foundRectangleContentModel );
}