@property<EOL><INDENT>def category(self):<DEDENT>
try:<EOL><INDENT>return self._op().category<EOL><DEDENT>except TypeError:<EOL><INDENT>return None<EOL><DEDENT>
Category for this processing logic.

        An arbitrary application label allowing grouping of application
        elements by category.

        Assign categories based on common function.
        For example, `database` is a common category that you can
        use to group all database sinks in an application.

        A category is not required and defaults to ``None`` meaning
        no assigned category.

        Streams console supports visualization based upon categories.

        Raises:
            TypeError: No directly associated processing logic.

        .. note:: A category has no affect on the execution of the application.

        .. versionadded:: 1.9