docs: def getPassage(self, urn, inventory=None, context=None):
          """ Retrieve a passage
  
          :param urn: URN identifying the text's passage (Minimum depth : 1)
          :type urn: text
          :param inventory: Name of the inventory
          :type inventory: text
          :param context: Number of citation units at the same level of the citation hierarchy as the requested urn, immediately preceding and immediately following the requested urn to include in the reply
          :type context: int
          :rtype: str
          """
          return self.call({
              "inv": inventory,
              "urn": urn,
              "context": context,
              "request": "GetPassage"
          })