def parse(node)
      node.xpath('*').each do |node_children|
        case node_children.name
        when 'Relationship'
          @relationship << Relationship.new(parent: self).parse(node_children)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |node_children|
        case node_children.name
        when 'Relationship'
          @relationship << Relationship.new(parent: self).parse(node_children)
        end
      end
      self
    end
Parse Relationships
 @param [Nokogiri::XML:Node] node with Relationships
 @return [Relationships] result of parsing