raise: Raises an exception 

  The 'raise' tag raises an exception, mirroring the Python 'raise'
  statement.

  Syntax

    'raise' tag syntax::

      <dtml-raise ExceptionName|ExceptionExpression>
      </dtml-raise>

    The 'raise' tag is a block tag. It raises an exception. Exceptions
    can be an exception class or a string. The contents of the tag are
    passed as the error value.

  Examples

    Raising a KeyError::

      <dtml-raise KeyError></dtml-raise>

    Raising an HTTP 404 error::

      <dtml-raise NotFound>Web Page Not Found</dtml-raise>

  See Also

    "try tag":dtml-try.stx

    "Python Tutorial: Errors and
    Exceptions":http://www.python.org/doc/current/tut/node10.html

    "Python Built-in
    Exceptions":http://www.python.org/doc/current/lib/module-exceptions.html