Parses a given document into a user-defined struct (see: Saxaboom.Mapper for more information)

Takes as arguments:

• xml: a string or stream of XML data
• into a Saxaboom.Mapper type that describes the document to be parsed

Takes as keyword arguments:

• adapter: an atom describing the adapter to use when parsing the document
  • Defaults to xmerl
• parser_options: a list of options to pass down to the chosen adapter. Refer to the parser documentation for more information.

Returns:

• A tuple containing the status and the parsed structure, optionally error information surfaced from the underlying parser