DRAW Reference Manual
Graphical Representation : Representation Rules
Representation Rules
The Representation Ruleset owns a series of Representation Rules, each of which contains a reference to a different Representation Style. A Ruleset can therefore be used to produce several graphical representations of the same VIEW. An example of the commands for setting up a Ruleset is:
NEW RRST /RSET1
- create Ruleset
NEW RRUL /R11 
- create Rule
USE /S2 FOR crit
- set Style reference (STYF). /S2 must already exist;
crit = Design element name or selection criteria
When more than one Rule is created, the order of the command sequence is important. Consider the command sequences:
Sequence 1
Sequence 2
NEW RRUL /R1
NEW RRUL /R1
USE /S2 FOR ALL EQUIP
USE /S2 FOR ALL NOZZ
NEW RRUL /R2
NEW RRUL /R2
USE /S2 FOR ALL NOZZ
USE /S1 FOR ALL EQUIP
Sequence 1 would result in Nozzles being drawn according to style /S1, sequence 2 would give Nozzles in style /S2.
You can also assign a style reference to an individual named Design element or a series of named elements, for example:
USE /S2 FOR /PUMP1-1 /VESS1
Note:
That the Design element must have a name: identifiers such as CE, FIRST EQUI, STRU 4 etc. cannot be used.
Representation Rules can reference IDLIsts, using expressions if required. For example:
USE /STYLE1 FOR /LIST24 /LIST25
USE /STYLE2 FOR ALL IDLISTS WITH ( FUNC EQ 'STEAM' )
Once a Rule has been created, and a style set, the selection criteria can be changed without specifying the style by giving the command:
USE FOR crit
 
Example: 
USE FOR ALL BRAN WITH ( HBORE LE 80 )
Alternatively, the CRIT attribute can be set explicitly;
Example: 
CRIT ALL BRAN WITH ( HBORE LE 80 )
You can set up a rule to omit elements from a selection. For example, the following Rules (in the given order) will have the effect of drawing all Branches in Style S2 except small bore Branches, which will not be drawn at all:
NEW RRUL /SMALLBORE
OMIT ALL BRAN WITH ( HBORE LE 80 AND TBORE LT 30 )
NEW RRUL /BRANCHES
USE /S2 FOR ALL BRAN
Named elements can also be omitted:
Example: 
OMIT /EQUIP99
The OMIT command sets the OMITFG attribute of the Rule, which automatically unsets the STYF of the Rule.
DRAW determines the style to use from a particular element by scanning through the list of RRULs (in database order) until a selection criteria is matched. If DRAW is unable to find a relevant rule for a component the default style will be used. This is:
Tube Off
Centreline On
Profile Off
Pline On
Drawing Level 0
Ffstyle SOLID
Ffcolour 1
Clstyle CHAINED
Clcolour 1
Other drawing styles Off
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