docs: def _inclusiveNamespacePrefixes(node, context, unsuppressedPrefixes):
      '''http://www.w3.org/TR/xml-exc-c14n/ 
      InclusiveNamespaces PrefixList parameter, which lists namespace prefixes that 
      are handled in the manner described by the Canonical XML Recommendation'''
      inclusive = []
      if node.prefix:
          usedPrefixes = ['xmlns:%s' %node.prefix]
      else:
          usedPrefixes = ['xmlns']
  
      for a in _attrs(node):
          if a.nodeName.startswith('xmlns') or not a.prefix: continue
          usedPrefixes.append('xmlns:%s' %a.prefix)
  
      unused_namespace_dict = {}
      for attr in context:
          n = attr.nodeName
          if n in unsuppressedPrefixes:
              inclusive.append(attr)
          elif n.startswith('xmlns:') and n[6:] in unsuppressedPrefixes:
              inclusive.append(attr)
          elif n.startswith('xmlns') and n[5:] in unsuppressedPrefixes:
              inclusive.append(attr)
          elif attr.nodeName in usedPrefixes:
              inclusive.append(attr)
          elif n.startswith('xmlns:'):
              unused_namespace_dict[n] = attr.value
  
      return inclusive, unused_namespace_dict