def remove_accessibility_type(self, accessibility_type=None):
if accessibility_type is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>metadata = Metadata(**settings.METADATA['<STR_LIT>'])<EOL>if metadata.is_read_only() or metadata.is_required():<EOL><INDENT>raise NoAccess()<EOL><DEDENT>if (accessibility_type._my_map['<STR_LIT:id>']) not in self._my_map['<STR_LIT>']:<EOL><INDENT>raise NotFound()<EOL><DEDENT>self._my_map['<STR_LIT>'].remove(accessibility_type._my_map['<STR_LIT:id>'])<EOL>
Removes an accessibility type.

        :param accessibility_type: accessibility type to remove
        :type accessibility_type: ``osid.type.Type``
        :raise: ``NoAccess`` -- ``Metadata.isReadOnly()`` is ``true``
        :raise: ``NotFound`` -- acessibility type not found
        :raise: ``NullArgument`` -- ``accessibility_type`` is ``null``

        *compliance: mandatory -- This method must be implemented.*