docs: def parse_exposure(self, node):
          """
          Parses <Exposure>
  
          @param node: Node containing the <Exposure> element
          @type node: xml.etree.Element
  
          @raise ParseError: Raised when the exposure name is not
          being defined in the context of a component type.
          """
  
          if self.current_component_type == None:
              self.raise_error('Exposures must be defined in a component type')
  
          try:
              name = node.lattrib['name']
          except:
              self.raise_error('<Exposure> must specify a name')
  
          try:
              dimension = node.lattrib['dimension']
          except:
              self.raise_error("Exposure '{0}' must specify a dimension",
                               name)
  
          description = node.lattrib.get('description', '')
  
          self.current_component_type.add_exposure(Exposure(name, dimension, description))