code: def build(cls, root, schema, filter=('*',)):
          
          children = []
          for node in root.getChildren(ns=Namespace.xsdns):
              if '*' in filter or node.name in filter:
                  child = cls.create(node, schema)
                  if child is None:
                      continue
                  children.append(child)
                  c = cls.build(node, schema, child.childtags())
                  child.rawchildren = c
          return children
docs: Build an xsobject representation.
          @param root: An schema XML root.
          @type root: L{sax.element.Element}
          @param filter: A tag filter.
          @type filter: [str,...]
          @return: A schema object graph.
          @rtype: L{sxbase.SchemaObject}