def collect_navigation_properties(klass_name, element, doc)
    nav_props = element.xpath(".//edm:NavigationProperty", @ds_namespaces)
    @class_metadata[klass_name].merge!(build_property_metadata(nav_props))
    nav_props.collect { |p| p['Name'] }
  end
def collect_navigation_properties(klass_name, element, doc)
    nav_props = element.xpath(".//edm:NavigationProperty", @ds_namespaces)
    @class_metadata[klass_name].merge!(build_property_metadata(nav_props))
    nav_props.collect { |p| p['Name'] }
  end
Similar to +collect_properties+, but handles the navigation properties