old_contents: from sfa.rspecs.elements.element import Element
  from sfa.rspecs.elements.sliver import Sliver
  
  class PGv2SliverType:
  
      @staticmethod
      def add_slivers(xml, slivers):
          if not slivers:
              return 
          if not isinstance(slivers, list):
              slivers = [slivers]
          for sliver in slivers: 
              sliver_elem = xml.add_element('sliver_type')
              if sliver.get('type'):
                  sliver_elem.set('name', sliver['type'])
              if sliver.get('client_id'):
                  sliver_elem.set('client_id', sliver['client_id'])  
              PGv2SliverType.add_sliver_attributes(sliver_elem, sliver.get('tags', []))
      
      @staticmethod
      def add_sliver_attributes(xml, attributes):
          for attribute in attributes:
              if attribute['name'] == 'initscript':
                  xml.add_element('{%s}initscript' % xml.namespaces['planetlab'], name=attribute['value'])
              elif tag['tagname'] == 'flack_info':
                  attrib_elem = xml.add_element('{%s}info' % self.namespaces['flack'])
                  attrib_dict = eval(tag['value'])
                  for (key, value) in attrib_dict.items():
                      attrib_elem.set(key, value)                
      @staticmethod
      def get_slivers(xml, filter={}):
          xpath = './default:sliver_type | ./sliver_type'
          sliver_elems = xml.xpath(xpath)
          slivers = []
          for sliver_elem in sliver_elems:
              sliver = Sliver(sliver_elem.attrib,sliver_elem)
              if 'component_id' in xml.attrib:     
                  sliver['component_id'] = xml.attrib['component_id']
              if 'name' in sliver_elem.attrib:
                  sliver['type'] = sliver_elem.attrib['name']
              slivers.append(sliver)
          return slivers
  
      @staticmethod
      def get_sliver_attributes(xml, filter={}):
          return []             
  
new_contents: from sfa.rspecs.elements.element import Element
  from sfa.rspecs.elements.sliver import Sliver
  
  class PGv2SliverType:
  
      @staticmethod
      def add_slivers(xml, slivers):
          if not slivers:
              return 
          if not isinstance(slivers, list):
              slivers = [slivers]
          for sliver in slivers: 
              sliver_elem = xml.add_element('sliver_type')
              if sliver.get('type'):
                  sliver_elem.set('name', sliver['type'])
              if sliver.get('client_id'):
                  sliver_elem.set('client_id', sliver['client_id'])  
              PGv2SliverType.add_sliver_attributes(sliver_elem, sliver.get('tags', []))
      
      @staticmethod
      def add_sliver_attributes(xml, attributes):
          if attributes: 
              for attribute in attributes:
                  if attribute['name'] == 'initscript':
                      xml.add_element('{%s}initscript' % xml.namespaces['planetlab'], name=attribute['value'])
                  elif tag['tagname'] == 'flack_info':
                      attrib_elem = xml.add_element('{%s}info' % self.namespaces['flack'])
                      attrib_dict = eval(tag['value'])
                      for (key, value) in attrib_dict.items():
                          attrib_elem.set(key, value)                
      @staticmethod
      def get_slivers(xml, filter={}):
          xpath = './default:sliver_type | ./sliver_type'
          sliver_elems = xml.xpath(xpath)
          slivers = []
          for sliver_elem in sliver_elems:
              sliver = Sliver(sliver_elem.attrib,sliver_elem)
              if 'component_id' in xml.attrib:     
                  sliver['component_id'] = xml.attrib['component_id']
              if 'name' in sliver_elem.attrib:
                  sliver['type'] = sliver_elem.attrib['name']
              slivers.append(sliver)
          return slivers
  
      @staticmethod
      def get_sliver_attributes(xml, filter={}):
          return []             
  
subject: fix type error