A condition clause in a Rule-Based Control takes the form of:

object id attribute relation value

where

object	=	a category of network object
id	=	the object's ID label
attribute	=	an attribute or property of the object
relation	=	a relational operator
value	=	an attribute value

Some example conditional clauses are:
  JUNCTION 23 PRESSURE > 20
  TANK T200 FILLTIME BELOW 3.5
  LINK 44 STATUS IS OPEN
  SYSTEM CLOCKTIME = 7:30 AM
  SYSTEM DEMAND >= 1500

Objects can be any of the following keywords:
  NODE  JUNCTION  TANK  RESERVOIR
  LINK  PIPE  PUMP  VALVE
  SYSTEM

When SYSTEM is used in a condition no ID is supplied.

The following attributes can be used with Node-type objects:
   DEMAND
   HEAD
   PRESSURE

The following attributes can be used with Tanks:
   LEVEL
   FILLTIME (hours needed to fill a tank)
   DRAINTIME (hours needed to empty a tank)

These attributes can be used with Link-Type objects:
   FLOW
   STATUS (OPEN, CLOSED, or ACTIVE)
   SETTING (pump speed or valve setting)

The SYSTEM object can use the following attributes:

DEMAND	(total system demand)
TIME	(hours from the start of the simulation expressed
	either as a decimal number or in hours:minutes format)
CLOCKTIME	(24-hour clock time with AM or PM appended)

Relation operators consist of the following:

=	IS
<>	NOT
<	BELOW
>	ABOVE
<=
>=